Ignition System Inspection and Component Testing (Distributor
Contents
1. Hall effect sensor connector Cengage Learning 2012 Figure 38 28 Testing a Hall effect switch with a logic probe On one side the red light should come on The green light should illuminate when the probe is touched to the other side 14 Locate the ignition coil and disconnect the primary and secondary wiring Task Completed 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted 324 Job Sheet 92 15 Test the coil by measuring the resistance on the primary side and the secondary side of the coil Report your findings below Primary coil resistance __ ________ mmm Secondary coil resistance __E n ae Cengage Learning 2012 a b Figure 38 22 a Checking the resistance in coil windings b Checking a waste spark coil 16 Do your readings indicate a problem with the coil 17 Connect the voltmeter to a known good ground and the B connection of the primary circuit of the coil Crank the engine and check for voltage Does the primary circuit have voltage present 18 Reconnect the coil connections and start the engine Check the voltage drop of the ground side of the primary coil circuit Does the reading indicate a problem 19 Using a scan tool connect to the vehicle and view graph the camshaft sensor and or crankshaft sensor s output below 2012 Cengage Learning Inc Licensed for one time use by the pur2. 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 93 329 Problems Encountered INSTRUCTOR EVALUATION 4 Mastered Task Able to Perform Task Independently Some Additional Training Suggested Able to Perform Task with Close Supervision Requires Additional Training Unable to Perform Task Not Attempted Ooooagodqo orn Ww Comments Instructor Name __ eT Date Instructor Signature 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted
3. JOB SHEET 92 Ignition System Inspection and Component Testing Distributor Vehicle Name __ O Staton WCC N NUUUC DAtee NATEF Correlation This Job Sheet addresses the following NATEF task s 8 C 2 Inspect and test ignition primary and secondary circuit wiring and solid state components test ignition coil s perform necessary action P 1 8 C 3 Inspect and test crankshaft and camshaft position sensor s perform necessary action P 1 Performance Objective s Upon completion of this Job Sheet you will be able to understand how to properly test and inspect elec tronic distributor ignition systems You will also be able to test the individual circuits and components that relate to the operation and timing of the ignition system as well as test camshaft and or crankshaft amp sensors Tools and Materials Service manual Technician s tool set DMM Feeler gauge set or spark plug gapping tool Fused jumper wire Tape measure Scan tool Protective Clothing Equipment Goggles or safety glasses with side shields _Describe the vehicle being worked on vin ____Engine ypeandsize PROCEDURE 1 Check the firing order to make sure that the spark plug wires are installed correctly Visually inspect each of the spark plug wires and spark plug boots Note how the wires are routed and secured in wire looms for reinstallation Task Completed 320 2012 Cengage Learning Inc Licensed
4. ankshaft sensors Tools and Materials Service manual Technician s tool set DMM Tape measure Scan tool DSO Feeler gauge set or spark plug gapping tool Protective Clothing Equipment Goggles or safety glasses with side shields Describe the vehicle being worked on Engine type and size 326 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 93 327 PROCEDURE Note This Job Sheet can be used for COP or direct ignition vehicles by omitting 1 2 and 8 1 Check the firing order to make sure that the spark plug wires are installed and paired correctly Visually inspect each of the spark plug wires and spark plug boots Note how the wires are routed and secured in wire looms for reinstallation Task Completed Remove the spark plug wires and check the resistance and length of each wire Record your readings below What type of spark plug is supposed to be used in this vehicle Remove each of the spark plugs visually inspect them and report their condition below Pek eee ees ee pera S condition TT do So T To S Do the spark plugs require repair or replacement Reinstall or replace the spark plugs What is their torque specification Note Apply antiseize compound to the spark plug threads before installing them Do not apply too much antiseize a light coating on the threads is all
5. chaser only no additional copying or retransmission is permitted Job Sheet 92 325 20 Does this appear to be normal or is there a problem Problems Encountered INSTRUCTOR EVALUATION Oo ooaaqa OoOreN W Mastered Task Able to Perform Task Independently Some Additional Training Suggested Able to Perform Task with Close Supervision Requires Additional Training Unable to Perform Task Not Attempted Comments Instructor Name a o Date Instructor Signature 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Or ignition System Inspection and Component Testing DIS or COP Vehicle Name i OMUUUUC SSS latioon Dat NATEF Correlation This Job Sheet addresses the following NATEF task s 8 C 2 Inspect and test ignition primary and secondary circuit wiring and solid state components test ignition coil s perform necessary action P 1 8 C 3 Inspect and test crankshaft and camshaft position sensor s perform necessary action P 1 Performance Objective s Upon completion of this Job Sheet you will be able to understand how to properly test and inspect electronic distributorless ignition systems DIS You will also be able to test the individual circuits and components that relate to the operation and timing of the ignition system as well as test camshaft and or cr
6. for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 92 321 2 Remove the spark plug wires and check the resistance and length of each wire Record your readings below Cengage Learning 2012 Figure 38 16 Checking the resistance of a spark plug wire and distributor cap 3 What type of spark plug is supposed to be used in this vehicle 4 Remove each of the spark plugs visually inspect them and report their condition below ee Oe Geet Cees a eee ee ke eae ee Condition do do To T Condition i a g Gap Tim Gilles Figure 38 5 Worn and normal spark plugs 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted 322 Job Sheet 92 6 Do the spark plugs require repair or replacement 7 If needed adjust the gap of the spark plugs and reinstall them or replace the spark plugs What is their torque specification Note Apply antiseize compound to the spark plug threads before installing them Do not apply too much antiseize a light coating on the threads is all that is needed Apply anti seize compound here only 3 i q E Figure 38 7 This too is used to bend the ground Figure 38 11 A small amount of antiseize electrode to set the gap compound can be applied to the upper area of the spark plug threads 8 Check to see if the distributor cap i
7. s seated properly Task Completed 9 Remove the distributor cap and visually inspect the cap and rotor for cracks chips and carbon tracking Replace it if needed Task Completed Broken tower rotor contact 3 2 3 Carbon Burned terminal tracks z Figure 38 19 Places where a distributor cap can be damaged or worn 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted Job Sheet 92 323 10 If the vehicle has a pickup coil use the ohmmeter to check the resistance of the coil and compare it to the manufacturer s specification Does it have the correct resistance Note You can also check the pickup coil by measuring the AC voltage while the engine is cranking This is best done with an analog meter or a digital storage oscilloscope 11 If the vehicle has a pickup coil measure the air gap with a feeler gauge What is the clearance Permanent coil assembly Reluctor Cengage Learning 2012 Pole piece Figure 37 20 A magnetic type AC generator pickup 12 Compare your reading to the manufacturer s specification and adjust as needed Task Completed 13 If the vehicle has a Hall effect switch crankshaft or camshaft sensor connect the voltmeter to the output wire and ground Turn the ignition on Move a steel feeler gauge back and forth between the sensor and the magnet Report what the voltmeter reads when you do this
8. that is needed Visually inspect the coil towers of the coil pack for burns corrosion and any signs of arcing Task Completed Are there any TSBs related to the ignition system of this vehicle 2012 Cengage Learning Inc Licensed for one time use by the purchaser only no additional copying or retransmission is permitted 328 Job Sheet 93 10 Remove each of the coil packs and test the coil for resistance on the primary and secondary sides Report your findings below Primary coil resistance Secondary coil resistance 11 Reinstall the coil packs What is their torque specification 12 Locate the ignition control module Task Completed 13 Test the B wire of the ignition control module for voltage Task Completed 14 With the engine running test the ground wire connection of the ignition control module for voltage drop What is your reading 15 Where are the crankshaft and camshaft sensors located for this vehicle 16 Visually inspect the crank and cam sensor wiring connections Task Completed 17 Using the feeler gauge measure the air gap of the crank sensor if applicable 18 Set up the DSO to measure voltage over time and connect it to the crankshaft or camshaft sensor output wire and a known good ground Task Completed 19 Start the engine and let it idle Draw the graph that was displayed on the DSO below 20 Refer to the service manual Does the crank sensor appear to be working properly
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