3.6l engine controls and fuel troublesho... 127KB Oct 17 2012 12:25
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1. 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro SYMPTOMS ENGINE CONTROLS DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category SYMPTOMS DESCRIPTION Driveability symptoms do not set DTCs The driveability symptoms are defined below Certain conditions can cause multiple symptoms These conditions are listed together Additional conditions that may only cause certain symptoms are listed separately Perform the Symptoms Testing before using the Additional Symptoms Tests SYMPTOMS DEFINITION Backfire Fuel ignites in the intake manifold or in the exhaust system making a loud popping noise Cuts Out Misses A steady pulsation or jerking that follows engine speed which is usually more pronounced as the engine load increases This condition is not normally felt above 1500 RPM or 48 km h 30 mph The exhaust has a steady spitting sound at idle or at low speed Detonation Spark Knock A mild to severe ping which usually occurs worse while under acceleration The engine makes sharp metallic knocks that change with throttle opening Dieseling Run On Fuel ignites in the i2. procedures for DTCs that relate to EVAP system leaks 6 Ignition ON seal the EVAP system per instructions in the service procedures for DTCs that relate to EVAP system leaks Most systems can be sealed using a scan tool output control for the EVAP canister vent solenoid valve other systems require that the vent system be plugged NOTE e Larger volume fuel tanks and or those with lower fuel levels may require several minutes to fill with nitrogen e Static buildup may cause the float indicator to stick It may be necessary to tap on the flowmeter to free up the float 7 Press and release the remote switch to activate the nitrogen flow and fill the system 8 Compare the stable floating indicator position to the red flag e ABOVE the red flag the result is UNACCEPTABLE FAIL Go to Smoke Procedure e BELOW the red flag the result is ACCEPTABLE PASS Test complete 9 Press and release the remote switch to deactivate the tester 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro SMOKE PROCEDURE LOCATE THE LEAK NOTE It is not recommended to use the tester in an outside repair bay area because wind and sunlight may affect temperature and your ability to see the smoke 1 Turn OFF any fans that may cause air movement around or near the vehicle NOTE Completely unwind the nitrogen smoke hose from the bracket to optimize the tester s performance 2 Connect the ni
3. of Coolant or Oil Consumption Diagnosis o Wet down the secondary ignition system with water from a spray bottle Wetting down the secondary ignition system may help locate damaged or deteriorated components Look listen for arcing or misfiring as the water is applied o Weak spark using the J 26792 Spark Tester Refer to Electronic Ignition System Diagnosis e The operation of the transmission torque converter clutch TCC The scan tool should indicate an engine speed drop when the TCC is commanded ON e The operation of the A C compressor Items that can cause an engine to run lean or rich Refer to DTC P2177 P2179 P2187 or P2189 ALLT e The crankshaft position CKP sensor for an intermittent condition Observe the scan tool CKP Resync parameter The Resync parameter should remain at 0 during all operating conditions and when moving the related harnesses and connectors between the CKP sensor and the ECM The engine for the following mechanical failures Refer to Symptoms Engine Mechanical Excessive oil in the combustion chamber or leaking valve seals Incorrect cylinder compression Sticking or leaking valves Worn camshaft lobes Incorrect valve timing Broken valve springs oO Oo 0 0 0 0 O Excessive carbon buildup in the combustion chambers Clean the chambers with top engine cleaner Follow the instructions on the can o Incorrect engine parts e Vacuum hoses for splits or kinks e Knock sensor KS system for excessive s
4. or run While this voltage is being received the fuel pump control module closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure REFERENCE INFORMATION Schematic Reference Engine Controls Schematics Connector End View Reference Component Connector End Views Description and Operation Fuel System Description Electrical Information Reference e Circuit Testing e Connector Repairs e Testing for Intermittent Conditions and Poor Connections e Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code DTC Type Definitions Scan Tool Reference Control Module References for scan tool information CIRCUIT SYSTEM VERIFICATION 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Ignition ON command the fuel pump ON and OFF using the scan tool ECM output control The fuel pump should turn on and off CIRCUIT SYSTEM TESTING 1 Ignition OFF disconnect the harness connector at the G12 fuel pump 2 Connect a test lamp between the control circuit terminal 1 and ground 3 Ignition ON command the G12 fuel pump ON and OFF using a scan tool ECM fuel pump output control The test lamp should turn ON and OFF as commanded o If the test lamp is always ON test the control circuit for a short to voltage If the circuit tests normal replace the K27 fue
5. 3 Subtract 50 from the reading on the DMM in order to obtain the percentage of alcohol in the fuel sample Refer to the examples in the Fuel Composition Test Examples table 4 If the fuel sample contains greater than 15 percent ethanol add fresh regular gasoline to the vehicle s fuel tank 5 Test the fuel composition 6 If testing shows the ethanol percentage is still greater than 15 percent replace the fuel in the vehicle Refer to Fuel Tank Draining Fuel Composition Test Examples Po Frequency Hz Subtract 50 Ethanol Percent Example A 50 Hz 50 0 Example B 65 Hz 50 15 Example C 129 Hz ALCOHOL CONTAMINANTS IN FUEL DIAGNOSIS WITHOUT SPECIAL TOOL DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category DESCRIPTION Water contamination in the fuel system may cause driveability conditions such as hesitation stalling no start or misfires in one or more cylinders Water may collect near a single fuel injector at the lowest point in the fuel rail and cause a misfire in that cylinder If the fuel system is contaminated with water inspect the fuel system components for rust or deterioration 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6
6. FOB folded 90 degrees when attempting to start the engine This may cause an intermittent no start condition If you receive a customer complaint of an intermittent no start condition verify that the customer is not folding the key while attempting to start the engine The fob must be parallel to the key to function properly e The engine control module ECM uses the camshaft position CMP sensors to determine engine speed and position when there is a crankshaft position CKP sensor condition e The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory With a CKP sensor condition in the signal circuit the engine will go into a limp home mode after a hard restart The ECM then calculates engine speed from one of the CMP sensors e The fuel pump flow control module FPCM controls and monitors the operation of the in tank fuel pump If the FPCM detects a fault a DTC sets in the FPCM The FPCM will then send a serial data message to the engine control module ECM requesting the illumination of the malfunction indicator lamp MIL e Insufficient fuel can cause a no start condition Thoroughly inspect the fuel delivery system for sufficient fuel volume to the fuel injectors Inspect the fuel supply components for partial blockage or restrictions e Fuel injectors with partially blocked and restricted nozzles or a malfunctioning solenoid can cause a no start conditio
7. L Camaro Alcohol concentrations greater than 10 percent in the fuel can be detrimental to fuel system components Alcohol contamination may cause fuel system corrosion deterioration of rubber components and subsequent fuel filter restriction Fuel contaminated with alcohol may cause driveability conditions such as hesitation lack of power stalling or no start Some types of alcohol are more detrimental to fuel system components than others ALCOHOL IN FUEL TESTING PROCEDURE The fuel sample should be drawn from the bottom of the tank so that any water present in the tank will be detected The sample should be bright and clear If alcohol contamination is suspected then use the following procedure to test the fuel quality 1 Using a 100 ml 3 38 oz specified cylinder with 1 ml 0 34 oz graduation marks fill the cylinder with fuel to the 90 ml 3 04 oz mark 2 Add 10 ml 0 34 oz of water in order to bring the total fluid volume to 100 ml 3 38 oz and install a stopper Shake the cylinder vigorously for 10 15 seconds Carefully loosen the stopper in order to release the pressure Re install the stopper and shake the cylinder vigorously again for 10 15 seconds ad Put the cylinder on a level surface for approximately 5 minutes in order to allow adequate liquid separation If alcohol is present in the fuel the volume of the lower layer that now contains both alcohol and water will be greater than 10 ml 0 37 oz For examp
8. TION Review the Inspection Maintenance I M System Status indicators All I M System Status indicators should report YES and no I M Test DTCs should be present INSPECTION MAINTENANCE I M SYSTEM SET PROCEDURE 1 Ensure that the vehicle meets the conditions for a cold start listed above o If the EVAP I M System Status indicator displays NO perform the EVAP Service bay test if applicable 2 Turn OFF all accessories HVAC system other electrical loads including aftermarket add on equipment etc and open the hood 3 Set the vehicle parking brake and ensure the vehicle is in park for automatic transmission or neutral for 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro 10 11 12 13 manual transmission Start and idle the engine for 2 min WARNING Refer to Road Test Warning Close the hood release the parking brake and Accelerate at part throttle to 72 80 km h 45 50 mph with this speed maintained until the engine reaches operating temperature 8 10 min Continue operation under these conditions for an additional 6 min Accelerate at part throttle to 90 km h 55 mph with this speed maintained for 2 min Release the accelerator pedal for at least 10 s This will allow the vehicle to enter the decel fuel cut off NOTE Do NOT touch the accelerator pedal until told to do so A change in TP Sensor angle or an increase in engine speed may inva
9. TOOL DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category DESCRIPTION 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Water contamination in the fuel system may cause driveability conditions such as hesitation stalling no start or misfires in one or more cylinders Water may collect near a single fuel injector at the lowest point in the fuel injection system and cause a misfire in that cylinder If the fuel system is contaminated with water inspect the fuel system components for rust or deterioration Ethanol concentrations of greater than 10 percent can cause driveability conditions and fuel system deterioration Fuel with greater than 10 percent ethanol could result in driveability conditions such as hesitation lack of power stalling or no start Excessive concentrations of ethanol used in vehicles not designed for it may cause fuel system corrosion deterioration of rubber components and fuel filter restriction TEST PROCEDURE 1 Test the fuel composition using J 44175 Fuel Composition Tester and J44175 3 Instruction Manual See Special Tools 2 If water appears in the fuel sample clean the fuel system refer to Fuel System Cleaning
10. ces for scan tool information Special Tools e CH 48027 Digital Pressure Gauge e J 37287 Fuel Line Shut off Adapter CIRCUIT SYSTEM VERIFICATION NOTE Repair all fuel system related DTCs before performing this diagnostic Inspect the fuel system for damage or external leaks before proceeding Verify that adequate fuel is in the fuel tank before proceeding The Fuel Pump Enable may need to be commanded ON a few times in order to obtain the highest possible fuel pressure Before proceeding with this test review the User Manual CH 48027 5 for Safety Information and Instructions 1 Ignition OFF all accessories OFF install a CH 48027 Gauge Refer to Fuel Pressure Gauge Installation and Removal 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro NOTE High fuel pressure readings may result due to hot soak fuel boiling With the engine OFF the fuel pressure may increase to the setting of the pressure relief regulator valve approximately 580 kPa 84 psi 2 Ignition ON engine OFF command the Fuel Pump Enable ON with a scan tool Verify the fuel pressure is between 276 448 kPa 40 65 psi and does not decrease more than 34 kPa 5 psi in 1 min 3 Engine idling at normal operating temperature verify the scan tool Fuel Pump Control Module Fuel Pressure Sensor parameter is between 276 324 kPa 40 47 psi CIRCUIT SYSTEM TESTING NOTE e The Fuel Pump Enable
11. e e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category CIRCUIT SYSTEM DESCRIPTION The engine control module ECM supplies a separate high voltage supply circuit and a high voltage control circuit for each fuel injector The injector high voltage supply circuit and the high voltage control circuit are both controlled by the ECM The ECM energizes each fuel injector by grounding the control circuit The ECM controls each fuel injector with 65 V This is controlled by a boost capacitor in the ECM During the 65 V boost phase the capacitor is discharged through an injector allowing for initial injector opening The injector is then held open with 12 V A fuel injector coil winding resistance that is too high or too low will affect the engine driveability The fuel injector coil windings are affected by temperature The resistance of the fuel injector coil windings will increase as the temperature of the fuel injector increases REFERENCE INFORMATION Schematic Reference Engine Controls Schematics Electrical Information Reference 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro e Circuit Testing e Connector Repairs e Testing for Intermittent Conditions and Poor Connections e Wiring Repairs COMPONENT TESTING NOTE e The resistance test must be performed at the
12. e accelerator pedal position SYMPTOMS VERIFICATION e The engine control module ECM and the malfunction indicator lamp MIL are operating correctly e There are no DTCs stored e The scan tool data is within the normal operating range e Bulletins are not available for the current symptom e The ECM grounds are clean tight and in the correct locations e The vehicle tires are correctly inflated and meet original equipment specifications e The air filter element is not restricted e If equipped inspect the hydro carbon HC absorber in the air cleaner assembly for ruptures that would leak charcoal into the air intake contaminating the sensing element of the mass air flow MAF sensor SYMPTOMS TESTING 1 Test for the following conditions e The fuel system for the following 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro o Correct fuel pressure Refer to Fuel System Diagnosis o Fuel injectors that are leaking or improper operation Refer to Fuel Injector Solenoid Coil Test o Contaminated or a poor fuel quality condition Refer to Alcohol Contaminants in Fuel Diagnosis with Special Tool or Alcohol Contaminants in Fuel Diagnosis without Special Tool e The ignition system for the following o Spark plugs for incorrect heat range or an abnormal condition Refer to Spark Plug Inspection o For diagnosis of coolant or oil fouled spark plugs Refer to Loss
13. e system pressure to drop Allowing the smoke to exit small holes at a low flow rate greatly enhances visibility 7 Introduce smoke into the system for an additional 60 seconds Continue introducing smoke at 15 second intervals as necessary 8 Using the a high intensity white light inspect the entire EVAP system path and look for the source of the leak indicated by the exiting smoke Introduce smoke at 15 second intervals as needed until leak source is identified TEMPERATURE VARIATION INSTRUCTIONS The Concern 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Ideal circumstances for conducting the EVAP Flowmeter Test require equal temperatures between the nitrogen gas and the vehicle EVAP system Significant differences in temperature between them can result in a flow or pressure change during testing causing misleading results Typically the Evaporative Emissions System Tester is stored indoors approximately 21 C 70 F Vehicles brought in for diagnosis may have an EVAP system at significantly different temperatures 40 to 43 C 40 to 1 10 F For Example NOTE With no temperature difference between the nitrogen gas and EVAP system the resulting vehicle EVAP system pressure will remain stable at 13 inches H20 once pressurized providing no leaks are present When the EVAP Flowmeter Tests are performed with significant differences in temperature between t
14. elated repairs will instruct the technician to clear the DTC information Clearing the DTC will reset the I M System Status indicators to NO Performing the I M Complete System Set Procedure will set each of the I M System Status indicators to YES 1 Observe the Engine DTC information with a scan tool Verify no DTCs are present o Ifa DTC is set that would prevent the I M System Status tests from completing diagnose that DTC before continuing Refer to Diagnostic Trouble Code DTC List Vehicle 2 Review applicable service bulletins for software updates that would prevent the I M System Status tests from completing o Ifa control module re program or other repair is required perform the Inspection Maintenance Complete System Set Procedure 3 Observe the I M System Status indicators o If any I M System Status indicators report NO perform the Inspection Maintenance Complete System Set Procedure 4 Observe the I M Test DTC information with a scan tool Verify there are no I M Test DTCs present o If an I M Test DTC is set and all of the I M System Status indicators are Yes there is no need to perform the Complete System Set Procedure Diagnose the DTC using the Diagnostic Trouble Code DTC List Vehicle and refer to Conditions for Clearing the I M Test DTCs 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro o If an IM Test DTC is set and the I M System Status indicator
15. er DTC P0030 P0031 P0032 P0036 P0037 P0038 P0050 P0051 P0052 P0056 P0057 or P0058 DTC P0135 P0141 P0155 or P0161
16. fuel injector or mis diagnosis will occur e The DMM and test leads must be calibrated to 0 ohms in order to prevent mis diagnosis Verify the resistance of each Q17 fuel injector with one of the following methods e If the engine coolant temperature ECT sensor is between 10 32 C 50 90 F the resistance of each Q17 fuel injector should be 1 25 1 75 ohms o If not within the specified range replace the Q17 fuel injector e If the ECT sensor is not between 10 32 C 50 90 F measure and record the resistance of each Q17 fuel injector with a DMM Subtract the lowest resistance value from the highest resistance value The difference between the lowest value and the highest value should be equal to or less than 0 45 ohms o If the difference is more than 0 45 ohms add all of the fuel injector resistance values to obtain a total resistance value Divide the total resistance value by the number of fuel injectors to obtain an average resistance value Subtract the lowest individual fuel injector resistance value from the average resistance value Compute the difference between the highest individual fuel injector resistance value and the average resistance value Replace the Q17 fuel injector that displays the greatest difference above or below the average REPAIR PROCEDURES Perform the Diagnostic Repair Verification after completing the diagnostic procedure Fuel Injector Replacement ALCOHOL CONTAMINANTS IN FUEL DIAGNOSIS WITH SPECIAL
17. he nitrogen gas and the vehicle EVAP system the following results can occur e An increase in flow during the flowmeter test can be caused by a vehicle s warm EVAP system cooling down e A decrease in flow during the flowmeter test can be caused by a vehicle s cool EVAP system warming up The Solution When working on a vehicle with significant temperature differences between the vehicle EVAP system and the nitrogen gas allow the vehicle EVAP system temperature to stabilize as close as possible to the temperature of the nitrogen gas before conducting the Flowmeter Test ELECTRONIC IGNITION SYSTEM DIAGNOSIS DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category CIRCUIT SYSTEM DESCRIPTION The ignition system on this engine uses individual ignition coils and ignition control IC circuits for each cylinder Ignition voltage is supplied to each bank of ignition coils The engine control module ECM controls the ignition system operation The ECM controls each coil using the IC circuits The ECM commands the IC circuit low when a spark event is requested The sequencing and timing are controlled by the ECM DIAGNOSTIC AIDS e The ignition coils for each bank are fused separately If a fuse opens or the ignition voltage circ
18. if the ECM detects low voltage when the MIL is commanded OFF or high voltage when the MIL is commanded ON REFERENCE INFORMATION Schematic Reference e Instrument Cluster Schematics e Engine Controls Schematics Connector End View Reference Component Connector End Views Electrical Information Reference e Circuit Testing e Connector Repairs e Testing for Intermittent Conditions and Poor Connections e Wiring Repairs Scan Tool Reference 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Control Module References for scan tool information CIRCUIT SYSTEM VERIFICATION NOTE Any MIL requesting DTCs that may be set should be diagnosed first 1 Ignition ON command the MIL ON and OFF with a scan tool The MIL should turn ON and OFF as commanded 2 Ignition ON command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters e MIL Control Circuit Low Voltage Test Status e MIL Control Circuit Open Test Status e MIL Control Circuit High Voltage Test Status Each parameter should toggle between OK and Not Run or Not Run and OK CIRCUIT SYSTEM TESTING 1 If any other IPC indicators or gauges are inoperative refer to Instrument Cluster Gauges Inoperative 2 Ignition OFF disconnect the K20 ECM harness connectors Ignition ON the MIL should not illuminate o If the MIL is illuminated test the MIL control circuit ter
19. ion Spark Knock Test the engine for an overheating condition Refer to Engine Overheating Poor Fuel Economy Inspect for foreign material accumulation in the throttle bore and for carbon deposits on the throttle plate and shaft Also inspect for throttle body tampering Rough Unstable or Incorrect Idle and Stalling Inspect the engine mounts Refer to Engine Mount Inspection Surges Chuggles Test the heated oxygen sensors HO2S The HO2S should respond quickly to a change in throttle position If the HO2S do not respond to different throttle positions inspect for contamination from fuel silicon or the incorrect use of RTV sealant The sensors may have a white powdery coating and result in a high but false signal voltage which gives a rich exhaust indication The ECM reduces the amount of fuel delivered to the engine causing a driveability condition Hard Start e Test the engine coolant temperature ECT sensor Compare the ECT sensor value to the intake air temperature IAT sensor value on a cold engine The ECT and IAT sensor values should be within 3 C 5 F If the ECT sensor is out of range with the IAT sensor test the resistance of the ECT sensor Refer 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro to Temperature Versus Resistance Engine Coolant Temperature Sensor for resistance specifications Replace the ECT sensor if the resistance is not withi
20. iously affect the accuracy of the tests Always allow enough time at least 15 minutes for the vehicle temperature to adjust to the shop temperature Refer to Temperature Variation Instructions for more information about vehicle versus shop temperatures 1 Engine OFF open the hood Position a large fan to blow air under the vehicle onto the fuel tank area 2 Connect the red battery clip from the tester to the positive battery terminal NOTE The vehicle battery must be fully charged for optimum tester performance 3 Connect the black battery clip from the tester to chassis ground FLOWMETER TEST LEAK DETECTION 1 Open the Nitrogen tank valve and turn the NITROGEN SMOKE valve on the front control panel to NITROGEN 2 Connect the hose to the correct test orifice on the bottom front of the tester For orifice size refer to the GM Service manual for the vehicle being tested The vehicle specific information can be found in service procedures for DTCs that relate to evaporative emission EVAP system leaks 3 Press and release the remote switch to activate the tester 4 Position the sliding red flag on the flowmeter to align with the floating indicator When the red flag is set press and release the remote switch to deactivate the tester 5 Remove the hose from the test orifice and install the hose onto the vehicle For proper connection location and the special tool numbers for any adapters that may be required refer to the service
21. l pump control module o If the test lamp is always OFF test the control circuit for a short to ground or an open high resistance If the circuit tests normal replace the K27 fuel pump control module 4 Ignition OFF connect a test lamp between the control circuit terminal 1 and the low reference circuit terminal 2 5 Ignition ON command the G12 fuel pump ON using a scan tool The test lamp should illuminate o If the test lamp does not illuminate test the low reference circuit terminal 1 for a short to voltage or an open high resistance If the circuit tests normal replace the K27 fuel pump control module 6 If all circuits test normal replace the G12 fuel pump REPAIR PROCEDURES Perform the Diagnostic Repair Verification after completing the diagnostic procedure Control Module References for fuel pump control module replacement setup and programming FUEL SYSTEM DIAGNOSIS DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category CIRCUIT SYSTEM DESCRIPTION The fuel system is an electronic returnless on demand design A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank Reducing the internal temperature of the fuel tank results i
22. le 3 Test the ignition system for spark Refer to Electronic Ignition System Diagnosis 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro 4 Ignition ON command the fuel pump ON with a scan tool You should hear the fuel pump turn ON o If the fuel pump does not turn ON refer to Fuel System Diagnosis 5 Ignition OFF install the CH 48027 Digital Pressure Gauge NOTE e The fuel pump may need to be commanded ON a few times in order to obtain the highest possible fuel pressure e Do NOT start the engine for this test 6 Ignition ON command an increase in the fuel line pressure with a scan tool The fuel line pressure should increase to greater than 410 kPa 60 psi as commanded o If the fuel pressure is not within range refer to Fuel System Diagnosis 7 Verify that the following conditions do not exist e Disconnect the MAF sensor The engine control module ECM will ignore the MAF sensor and default to the calculated air flow o If disconnecting the MAF sensor corrects the condition and the connections are OK replace the B75 MAF sensor Refer to Mass Airflow Sensor with Intake Air Temperature Sensor Replacement 8 Collapsed air intake duct to the throttle body 9 Restricted air filter element 10 Spark plugs for being gas or coolant fouled 11 A skewed engine coolant temperature ECT sensor Refer to Temperature Versus Resistance Engine Coolant Tem
23. le if the volume of the lower layer is increased to 15 ml 0 51 oz this indicates at least 5 percent alcohol in the fuel The actual amount of alcohol may be somewhat more because this procedure does not extract all of the alcohol from the fuel PARTICULATE CONTAMINANTS IN FUEL TESTING PROCEDURE The fuel sample should be drawn from the bottom of the tank so that any contaminants present in the tank will be detected The sample should be bright and clear If the sample appears cloudy or contaminated with water as indicated by a water layer at the bottom of the sample use the following procedure to diagnose the fuel 1 Using an approved fuel container draw approximately 0 5 liter 0 53 qt of fuel 2 Place the cylinder on a level surface for approximately 5 minutes in order to allow settling of the particulate contamination Particulate contamination will show up in various shapes and colors Sand will typically be identified by a white or light brown crystals Rubber will appear as black and irregular particles If particles are found clean the entire fuel system thoroughly Refer to Fuel System Cleaning EVAPORATIVE EMISSION SYSTEM DIAGNOSIS OPERATING INSTRUCTIONS FOR THE EVAPORATIVE EMISSION SYSTEM TESTER EEST 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Vehicle Setup NOTE A large difference between the vehicle temperature and shop temperature will ser
24. lidate this portion of the test Safely stop the vehicle with the engine in drive for automatic or neutral with the clutch pedal depressed and parking brake applied for manual Allow the vehicle to idle for 2 min Shift the vehicle to park for automatic and neutral for manual Turn OFF the ignition and exit the vehicle Do NOT disturb the vehicle for 45 min Observe the Inspection Maintenance I M System Status with a scan tool All of the I M System Status indicators should display YES o Ifthe EVAP I M System Status indicator displays NO turn OFF the ignition ensure that the vehicle meets the conditions for a cold start and repeat steps 6 11 three more times or until the EVAP I M System Status indicator transitions to YES If the indicator continues to display NO refer to the Inspection Maintenance System DTC Table to identify the DTCs that did not run o If any of the I M System Status indicators display NO refer to the Inspection Maintenance System DTC Table for the indicator which did not display YES The I M System DTC Table identifies the DTCs associated with each I M System Status Indicator NOTE An I M Test DTC will not be stored or erased from the ECU except at the end of trip processing which occurs 5 s after ignition OFF Observe the I M Test DTC information with a scan tool Verify there are no I M Test DTCs present o If an I M Test DTC is set diagnose the DTC using the Diagnostic Trouble Code DTC List Vehicle and refe
25. may need to be commanded ON a few times in order to obtain the highest possible fuel pressure e DO NOT start the engine e High fuel pressure readings may result due to hot soak fuel boiling With the engine OFF the fuel pressure may increase to the setting of the pressure relief regulator valve approximately 580 kPa 84 psi 1 Ignition ON engine OFF command the Fuel Pump Enable ON with a scan tool and observe the fuel pressure gauge while the fuel pump is operating Verify the fuel pressure is between 276 448 kPa 40 65 psi o If the fuel pressure is less than the specified range test inspect and repair the items listed below If all items test normal replace the primary fuel pump module e Restricted fuel feed pipe e Inspect the harness connectors and the ground circuits of the fuel pump for poor connections 2 Verify that the fuel pressure does not decrease more than 34 kPa 5 psi in 1 min o If the fuel pressure decreases more than the specified value perform the following procedure 1 Ignition OFF relieve the fuel pressure Refer to Fuel Pressure Relief 2 Install the J 37287 Adapter between the chassis fuel feed hose and the engine compartment fuel feed pipe 3 Open the valve on the J 37287 Adapter 4 Ignition ON command the Fuel Pump Enable ON with a scan tool and bleed the air from the CH 48027 Gauge 5 Command the Fuel Pump Enable ON and then OFF with a scan tool 6 Close the valve on the J 37287 Adap
26. minal X2 21 for a short to ground If the circuit tests normal replace the P16 IPC 3 Ignition ON connect a3 A fused jumper wire between the MIL control circuit terminal X2 21 and ground The MIL should illuminate o If the MIL does not illuminate test the MIL control circuit for a short to voltage or an open high resistance If the circuit tests normal replace the P16 IPC bulb 4 If all circuits connections test normal replace the K20 ECM REPAIR PROCEDURES Perform the Diagnostic Repair Verification after completing the diagnostic procedure e Instrument Cluster Replacement e Control Module References for ECM replacement setup and programming ENGINE CRANKS BUT DOES NOT RUN DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro CIRCUIT SYSTEM DESCRIPTION This Engine Cranks but Does Not Run diagnostic is an organized approach to identify a condition which causes the engine to crank but not start This diagnostic directs the technician to the appropriate system diagnosis DIAGNOSTIC AIDS Inspect for any of the following conditions e The Immobilizer system is not designed to have the key
27. n Refer to Fuel Injector Solenoid Coil Test e There may be fuel spray at the fuel injectors and the indicated fuel pressure may be correct yet there may not be enough fuel to start the engine If the fuel injectors and the injector circuit are OK and fuel spray is detected the fuel injector ON time may be inadequate If the engine control module ECM receives incorrect inputs from the various information sensors the fuel delivered by the fuel injectors may be inadequate to start the engine Check all the engine data parameters with a scan tool and compare the values indicated with the expected values or the values from a known good vehicle e Inspect the engine for good secure electrical grounds e Water or foreign material in the fuel can cause a no start or engine will not stay running condition During freezing weather water can freeze inside the fuel system The engine may start after 30 minutes in a heated repair shop The malfunction may not recur until parked overnight in freezing temperatures Extreme weather conditions can cause contaminated fuel to prevent the vehicle from starting e A vehicle that starts and runs after being brought to the repair shop for a no start condition may have an ignition system that is susceptible to moisture Spray water on the ignition system components and the wiring in order to check for an engine starting or will not stay running concern REFERENCE INFORMATION Schematic Reference 2010 Chevrole
28. n lower evaporative emissions An electric turbine style fuel pump attaches to the primary fuel pump module inside the fuel tank The fuel pump supplies fuel through the fuel feed pipe to the high pressure fuel pump The high pressure fuel pump supplies fuel to a variable pressure fuel rail Fuel enters the combustion chamber through precision multi hole fuel injectors The high pressure fuel pump fuel rail pressure fuel injection timing and injection duration are 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro controlled by the engine control module ECM The primary fuel pump module also contains a primary jet pump and a secondary jet pump Fuel pump flow loss caused by vapor expulsion in the pump inlet chamber is diverted to the primary jet pump and the secondary jet pump through a restrictive orifice located on the pump cover The primary jet pump fills the reservoir of the primary fuel pump module The secondary jet pump creates a venturi action which causes the fuel to be drawn from the secondary side of the fuel tank through the fuel transfer pipe to the primary side of the fuel tank REFERENCE INFORMATION Description and Operation Fuel System Description Electrical Information Reference e Circuit Testing e Connector Repairs e Testing for Intermittent Conditions and Poor Connections e Wiring Repairs Scan Tool Reference Control Module Referen
29. n specification Refer to Engine Coolant Temperature Sensor Replacement If the sensor is within the specification test the ECT circuits for a high resistance e Test the fuel pump operation The fuel pump should turn ON for 2 s when the ignition is turned ON Refer to Fuel System Diagnosis Hesitation Sag Stumble e Test the fuel pressure Refer to Fuel System Diagnosis e Test the generator Refer to Symptoms Engine Electrical Repair the charging system if the generator output voltage is less than 9 V or more than 16 V Poor Fuel Economy e Heavy loads being carried or towed e Acceleration rate too much or too often e Inspect for foreign material accumulation in the throttle bore and for carbon deposits on the throttle plate and shaft Also inspect for throttle body tampering POOR FUEL FILL QUALITY DEFINITION During the fueling process a continual occasional or no fuel nozzle shut off condition has occurred Difficult to fill Fuel fill limiter vent valve stuck closed Evaporative emission EVAP canister restricted EVAP vent valve stuck closed Hose between canister and canister vent solenoid twisted or kinked if applicable High fuel temperature Fuel filler hose is kinked Faulty dispensing nozzle Ignition switch ON vent valve closed Fill limiter vent valve stuck open or leaking Fuel inlet check valve stuck open Pre mature shut off of the fuel dispensing nozzle occurs immediately after engaging dispe
30. nsing nozzle tank empty Inlet check valve at tank stuck closed fill pipe full of fuel Restricted vapor lines or fuel fill pipe High fuel temperature Fuel tank full gauge not accurate e Kinked pinched or plugged lines in fuel tank vent system 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro EVAP t valve stuck closed tricted Pre mature shut off of the fuel Py een a E A dispensing nozzle more than 1 8 e EVAP canister restricted of tank capacity dispensed e Fuel limiting vent valve stuck closed or obstruction at top of fuel tank Fuel Spitback Restricted EVAP canister High fuel temperature Ignition switch ON EVAP vent valve closed MALFUNCTION INDICATOR LAMP MIL DIAGNOSIS DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category CIRCUIT SYSTEM DESCRIPTION The malfunction indicator lamp MIL is located on the instrument panel cluster IPC The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service The engine control module ECM monitors the MIL control circuit for conditions that are incorrect for the commanded state of the MIL For example a failure condition exists
31. ntake manifold or in the exhaust system making a loud popping noise Hard Start Engine cranks OK but does not start for a long time The vehicle does eventually run or may start but immediately stalls Hesitation Sag Stumble 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Momentary lack of response as the accelerator is pushed down This condition can occur at any vehicle speed This condition is usually more pronounced when first trying to make the vehicle move as from a stop This condition may cause the engine to stall in severe conditions Lack of Power Sluggishness or Sponginess The engine delivers less than expected power Little or no increase in speed when the accelerator pedal is pushed down part way Poor Fuel Economy Fuel economy as measured by an actual road test is noticeably lower than expected Also the fuel economy is noticeably lower than it was on this vehicle at one time as previously shown by an actual road test Poor Fuel Fill Quality Difficulty when refueling the vehicle Rough Unstable or Incorrect Idle and Stalling The engine runs unevenly at idle If severe the engine or the vehicle may shake Engine idle may vary in speed Either condition may be severe enough to stall the engine Surges Chuggles Engine power variation under steady throttle or cruise Feels like the vehicle speeds up and slows down with no change in th
32. park retard activity Observe the Knock Retard parameter for activity greater than 0 e The exhaust system components for the following o Physical damage or possible internal failure o The three way catalytic converters for a restriction 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro For more information refer to Symptoms Engine Exhaust e Electromagnetic interference EMI on an ignition control circuit can cause a misfire condition You can usually detect EMI with a scan tool by monitoring the engine speed parameter A sudden increase in the engine speed parameter with little change in actual engine speed indicates that EMI is present Inspect the high voltage components near the ignition control circuits if a condition exists e Inspect the positive crankcase ventilation PCV system and all connections for leaks or restrictions e Evaporative emission EVAP canister purge solenoid that is stuck open e The engine cooling system for the following conditions o The thermostat is the correct heat range Refer to Thermostat Diagnosis o Proper engine coolant level Refer to Cooling System Draining and Filling LS3 L99 Static Fill or Cooling System Draining and Filling LLT Static Fill or Cooling System Draining and Filling GE 47716 2 Ifthe above conditions do not address the symptom refer to the additional symptoms tests ADDITIONAL SYMPTOMS TESTS Detonat
33. perature Sensor 12 Exhaust system restricted Refer to Restricted Exhaust 13 Fuel contamination Refer to Aleohol Contaminants in Fuel Diagnosis with Special Tool or Alcohol Contaminants in Fuel Diagnosis without Special Tool 14 Engine mechanical condition for example worn timing chain and gears low compression Refer to Symptoms Engine Mechanical o If you find any of the above conditions repair as necessary REPAIR PROCEDURES Perform the Diagnostic Repair Verification after completing the diagnostic procedure FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provide an overview of each diagnostic category 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro DIAGNOSTIC FAULT INFORMATION Short to Open or High Short to Signal Circuit Ground Resistance Voltage Performance Fuel Pump High Signal P0231 P023F P0232 P023F P2635 Fuel Pump Low Signal as P023F Oo a P023F P2635 CIRCUIT SYSTEM DESCRIPTION The engine control module ECM supplies voltage to the fuel pump control module when the ECM detects that the ignition is on The voltage from the ECM to the fuel pump control module remains active for two seconds unless the engine is in crank
34. prising the monitor have illuminated the malfunction indicator lamp MIL Once all of the tests are completed the I M System Status display will indicate YES in the Completed column For example when the HO2S Heater Status indicates YES either all of the oxygen sensor heater tests have passed or one of the tests has illuminated the MIL If the vehicle has four heated oxygen sensors either all four heater circuit tests have passed or one of the heater circuit tests has illuminated the MIL The I M System Status 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro will indicate NO under the Completed column when any of the required tests for that system have not run The following is a list of conditions that would set the I M System Status indicator to NO e The vehicle is new from the factory and has not yet been driven through the necessary drive conditions to complete the tests e The battery has been disconnected or discharged below operating voltage e The control module power or ground has been interrupted e The control module has been reprogrammed e The control module DTCs have been cleared as part of a service procedure CONDITIONS FOR CLEARING I M TEST DTCS 1 Only the OBD II System can erase the I M Test DTC The OBD II system must determine that the malfunction that caused the I M Test DTC to be stored is no longer present and is not commanding the MIL Each of
35. r to Inspection Maintenance System Check Observe the engine DTC information with a scan tool Verify no DTCs are present o If a DTC is set diagnose using the Diagnostic Trouble Code DTC List Vehicle After repairs perform the Inspection Maintenance Complete System Set Procedure to verify no further DTCs are set INSPECTION MAINTENANCE SYSTEM DTC TABLE 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro DTCs Required to Set System Status to YES If an I M System Status indicator did NOT update to YES during the Inspection Maintenance System Check review each indicator and reference this table to determine each DTC associated with the I M System Status Indicator Each DTC listed below has specific conditions that must be met for the diagnostic to run Included within the conditions are additional DTCs which if set may inhibit the DTCs listed below from running Reviewing and operating the vehicle within the Conditions for Running for each DTC listed below will allow the I M System Status Indicators to transition to YES Catalyst DTC P0420 or P0430 O EVAP DTC P0442 DTC P0446 DTC P0455 or P0497 DTC P0496 Oxygen Sensor DTC P0130 or P0150 DTC P0131 or P0151 DTC P0132 or P0152 DTC P0133 or P0153 w LLT DTC P0137 P0138 P0140 P0157 P0158 or P0160 DTC P2096 or P2098 DTC P2097 or P2099 DTC P2232 or P2235 DTC P2270 or P2272 DTC P2271 or P2273 Oxygen Sensor Heat
36. s are NO diagnosis the DTC and perform the Inspection Maintenance Complete System Set Procedure INSPECTION MAINTENANCE COMPLETE SYSTEM SET PROCEDURE DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an overview of each diagnostic category DESCRIPTION The purpose of the Inspection Maintenance I M complete system set procedure is to satisfy the enable criteria necessary to execute all of the I M readiness diagnostics and complete the trips for those particular diagnostics When all I M monitored diagnostic tests are completed the I M System Status indicators are set to YES Perform the Inspection Maintenance I M Complete System Set Procedure if any I M System Status indicators are set to NO CONDITIONS FOR MEETING A COLD START e The ignition voltage between 10 and 15 V e The barometric pressure BARO is more than 75 kPa 10 9 psi e The engine coolant temperature ECT at start up is less than 42 C 108 F e The intake air temperature IAT is between 2 32 C 36 90 F e The engine is OFF for greater than 6 hours or the following conditions must be met o The start up IAT minus start up ECT are within 12 C 22 F o The start up ECT minus start up IAT are within 50 C 90 F e Fuel level is between 25 and 75 CIRCUIT SYSTEM VERIFICA
37. t Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro Engine Controls Schematics Connector End View Reference Component Connector End Views Electrical Information Reference e Circuit Testing e Connector Repairs e Testing for Intermittent Conditions and Poor Connections e Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code DTC Type Definitions Scan Tool Reference Control Module References for scan tool information Special Tools e CH 48027 Digital Pressure Gauge e J 26792 Spark Tester e For equivalent regional tools refer to Special Tools CIRCUIT SYSTEM VERIFICATION NOTE This diagnostic assumes the following e The battery is completely charged Refer to Battery Inspection Test e The engine cranking speed is acceptable Refer to Engine Cranks Slowly e There is adequate fuel in the fuel tank 1 Attempt to start the engine Observe the DTC information with a scan tool Verify that DTC P0116 P0118 P0119 P0335 P0336 P0338 P0513 P0601 P0602 P0603 P0606 PO62B P0627 P0628 P0629 P0633 P0685 P0690 PO69E P1631 P1649 P167D P1682 P2105 or U0109 does not set o If any of the listed DTCs are set refer to Diagnostic Trouble Code DTC List Vehicle 2 Ignition ON observe the Theft Deterrent parameter with a scan tool The parameter should display Disabled o If Enabled is displayed refer to Diagnostic Trouble Code DTC List Vehic
38. t tests normal and the ignition circuit fuse is open test all the components connected to the ignition voltage circuit and replace as necessary 3 Crank or start the engine Test for 200 400 mV between the appropriate IC circuit terminal C and ground o If less than the specified value test the IC circuit for a short to ground or an open high resistance If the circuit connection tests normal replace the K20 ECM o If greater than the specified value test the IC circuit for a short to voltage If the circuit connection tests normal replace the K20 ECM 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro 4 Connect a test lamp between the each of the ground circuits terminal A and terminal B and B The test lamp should illuminate on each circuit o If the test lamp does not illuminate test the suspected circuit for an open high resistance 5 If all circuits connections test normal replace the T8 ignition coil REPAIR PROCEDURES Perform the Diagnostic Repair Verification after completing the diagnostic procedure e Ignition Coil Replacement Bank 1 e Ignition Coil Replacement Bank 2 INSPECTION MAINTENANCE SYSTEM CHECK DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedure e Review Strategy Based Diagnosis for an overview of the diagnostic approach e Diagnostic Procedure Instructions provides an over
39. ter 7 Monitor the fuel pressure for 1 min o If the fuel pressure does not decrease more than 34 kPa 5 psi within the specified time replace the primary fuel pump module 3 Relieve the fuel pressure to 69 kPa 10 psi Verify that the fuel pressure does not decrease more than 14 kPa 2 psi in 5 min o If the fuel pressure decreases more than the specified value replace the primary fuel pump module 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro 4 Operate the vehicle within the conditions of the customer s concern while monitoring the fuel pressure with the CH 48027 Gauge The fuel pressure should not drop off during acceleration cruise or hard cornering o Ifthe fuel pressure drops off test inspect and repair the items listed below If all items test normal replace the primary fuel pump module e Restricted fuel feed pipe e Inspect the harness connectors and the ground circuits of the fuel pump for poor connections 5 If the fuel system tests normal refer to Symptoms Engine Controls REPAIR PROCEDURES Perform the Diagnostic Repair Verification after completing the diagnostic procedure e Fuel Feed Pipe Replacement e Fuel Line Replacement Chassis e Fuel Tank Fuel Pump Module Replacement Right Side FUEL INJECTOR SOLENOID COIL TEST DIAGNOSTIC INSTRUCTIONS e Perform the Diagnostic System Check Vehicle prior to using this diagnostic procedur
40. the following represents ways to clear an I M Test DTC e If the MIL goes out due to 3 passing drive cycles scan tool code clear is not used the I M Test DTC is erased at power down of the last drive cycle e Ifa scan tool code clear is used to turn OFF the MIL the I M Test DTC is not erased the DTC must PASS and not FAIL The I M Test DTC is erased at power down of the drive cycle e If the controller is reflashed reprogrammed all I M Test DTCs are erased 2 For the OBD II System to run a single drive cycle for clearing an I M Test DTC all of the following conditions must occur e Cumulative time of engine run time is greater than 600 s e Cumulative vehicle operation above 41 kPa 25 mph for over 300 s e Continuous vehicle idle for greater than 30 s e Turn ignition OFF for 5 s and allow the code to clear MONITORED EMISSION CONTROL SYSTEMS The OBD II system monitors all emission control systems that are on board Not all vehicles need every possible emission control system For example a vehicle may not be equipped with secondary air injection AIR or exhaust gas recirculation EGR The OBD I regulations require monitoring of the following if equipped e The air conditioning system e The catalytic converter efficiency e Comprehensive component monitoring Emission related inputs and outputs e The evaporative emission EVAP system e The fuel delivery system e Heated catalyst monitoring e Misfire monitoring e The o
41. trogen smoke hose to the vehicle as directed in the service procedures Some vehicles require that the nitrogen smoke hose be connected at the front of the EVAP system at the EVAP service port An adapter may be necessary Other vehicles require the connection be made at the rear of the system using an adapter at the fuel fill cap Consult the service procedures for DTCs that relate to evaporative emission EVAP system leaks for vehicle specific instructions regarding connection location and adapters 3 Open the nitrogen tank valve and turn the NITROGEN SMOKE valve on the control panel to SMOKE NOTE The remote switch operates in a push ON push OFF fashion 4 Press and release the remote switch to activate the tester and inject smoke into the EVAP system 5 Verify smoke has filled the EVAP system by opening the system opposite the end where smoke is injected When injecting smoke at the service port remove the fuel fill cap or temporarily leave the EVAP canister vent valve open until smoke is observed Then close the system and continue testing If using a special tool fuel fill cap adapter at the filler neck vent the system at the service port until smoke is observed then close the system to continue with the test NOTE Inject smoke in less than 2 minute cycles for optimum tester performance 6 Press and release the remote switch to deactivate the tester NOTE For optimum visual smoke performance deactivate the smoke flow and allow th
42. uit opens between the fuse and the splice all the ignition coils for one bank of the engine would be inoperative If the ground circuit opens at the engine block the ignition coils would be inoperative for one bank of the engine 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro e Inspect the ignition coils for aftermarket devices An aftermarket device connected to the ignition coil circuits may cause a condition with the ignition coils REFERENCE INFORMATION Schematic Reference Engine Controls Schematics Description and Operation Electronic Ignition System Description Electrical Information Reference e Circuit Testing e Connector Repairs e Testing for Intermittent Conditions and Poor Connections e Wiring Repairs Scan Tool Reference Control Module References for scan tool information Special Tools e J 26792 Spark Tester See Special Tools e J 43244 Relay Puller Pliers See Special Tools CIRCUIT SYSTEM TESTING NOTE Do not perform this diagnostic procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic 1 Ignition OFF disconnect the harness connector of the T8 ignition coil 2 Ignition ON load test for battery voltage between the ignition voltage circuit terminal D and ground o If less than B test the ignition voltage circuit for a short to ground or an open high resistance If the circui
43. view of each diagnostic category DESCRIPTION Several states require that a vehicle pass on board diagnostic OBD system tests and the inspection maintenance I M emission inspection in order to renew license plates This is accomplished by viewing the I M System Status display on a scan tool Using a scan tool the technician can observe the I M System Status in order to verify that the vehicle meets the criteria that complies with the local area requirements While testing in the I M System Status mode some DTCs may occur that are called I M Test DTCs An I M Test DTC is defined as a fault code that is currently commanding the MIL ON and is stored in non volatile memory The intended use of this data is to prevent vehicles from passing I M inspection without proper repair to the vehicle These fault codes are not erasable from any scan tool command or erasable by disconnecting power to the controller The I M Test DTCs will be supported by all emissions related ECUs such as ECMs TCMs FPCMs etc An I M Test DTC will not be stored or erased from the ECU except at the end of trip processing which occurs 5 s after ignition OFF CONDITIONS FOR UPDATING THE I M SYSTEM STATUS Each system requires at least one and sometimes several diagnostic tests The results of these tests are reported by a diagnostic trouble code DTC A system monitor is complete when either all of the DTCs comprising the monitor have Run and Passed or any one of the DTCs com
44. xygen sensor system O2S or HO2S 2010 Chevrolet Camaro LS 2010 ENGINE PERFORMANCE Engine Controls and Fuel 2 8L 3 0L 3 2L or 3 6L Camaro e The oxygen sensor heater system HO2S heater For the specific DTCs required for each system refer to Inspection Maintenance System DTC Table Systems such as misfire and comprehensive components may not be listed in a system status list These tests run continuously and do not require an I M System Status indicator DIAGNOSTIC AIDS The I M System Status display provides an indication of when the control module has completed the required tests This does not necessarily mean that the test has passed only that a decision was made If the diagnostic fails a DTC will indicate the failure If a failure indication is present for a DTC associated with one of the I M regulated systems it may prevent other required tests from running For example a DTC for the control circuit of the EVAP purge solenoid may not be listed in the Inspection Maintenance System DTC Table because it is a continuous test If this DTC is set the Active Tests for the EVAP system may not run The I M System Status information may be useful for a technician to determine if diagnostics have run when verifying repairs CIRCUIT SYSTEM VERIFICATION Review the I M System Status indicators All I M System Status indicators should report YES and no I M Test DTCs should be present CIRCUIT SYSTEM TESTING NOTE Many DTC r
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