FAULT CODE READER
Contents
1. RestfarCASsgmltECU 2 Jiiector valve contri Taneknock control fS 4 Knock sensor No CY 5 lgnition coll ontro No ff Hs mrepremwevawe ZZ E torso pressure regulation SI Lambdasensor NIN Ez uambdasptemconri ReereTPNS 3 f rge 4 C and antik modal Es Eo misture potentiometer Ci CCS s eodedantihe 57 lgnition coll conerotNo CY lex jKmeeksemorNa CS CS SEEN ReertsTENS 4 Mixture control ReferteTENS s C Gunson Fault Code Reader 9 TEST PROCEDURE NOTES TPN I VANE AIR FLOW METER This is positioned in the airstream and is opened by the flow of the air intake The greater the airflow the more the flap plate opens The flap plate is connected to a potentiometer that will produce a voltage reading proportional to the position of the flap plate To test a Vane Air Flow Meter probe the airflow meter connector with a voltage meter until the sensor output is identified The output will be a voltage of 0 5v to 4 5v or 4 5v to 9v The reading changes as the air flow is varie2. PTC TEMPERATURE SENSOR of POSITIVE TEMPERATURE COEFFICIENT type Low resistance when cold NTC NEGATIVE TEMPERATURE COEFFICIENT is low resistance hot ATS FTS CTS TTS TEMPERATURE SENSORS Air Fuel Coolant Transmission Gunson Fault Code Reader Il WARRANTY AND CUSTOMER SERVICE This warranty is in addition to the statutory rights of the purchaser The Tool Connection has made every effort to ensure that this product is of the highest quality and value to the customer However The Tool Connection can accept no responsibility for consequential damage howsoever caused arising from the use of this product All technical enquiries regarding this product should be made to The Tool Connection Technical Service Department 44 0 1926 818181 Please note that The Tool Connection cannot provide technical information or advice or service data on particular motor vehicles If this product should require service or repair it should be returned to The Tool Connection Technical Service Department Kineton Road Southam Warwickshire CV47 ODR England Please give full details of faults requiring attention when sending goods for service or repair Gunson 05 2005 Do you need a thingamajig or a whatsit for a doo dah LASER s New Tools Forum e Helps you find the tools you need e Helps us supply the tools you need e Helps others get more information New Tool Forum lasertools co uk If you do tools come and talk to
3. all of the connections and wiring associated with the indicated component are checked When multiple faults are indicated it is possible that the fault on one component is causing incorrect readings from other components but all the components will have to be checked to eliminate the true cause Gunson Fault Code Reader 5 CONNECTION DIAGNOSTIC SOCKET LOCATION The diagnostic socket is usually located close to the ECU or the main relays in the engine compartment It is a two pin socket with Female contacts the moulding is usually green Fault Code Reader connection Flat blade connector to socket A Alligator Clip to battery earth FAULT INDICATION AND DISPLAY TYPE It is normal for Citroen Peugeot vehicles to have an engine check light fitted to the instrument panel If a significant continuous fault is present this light should be illuminated An intermittent fault may record a code without setting the engine check light The engine check light is orange in appearance has a small engine silhouette with a transistor symbol on it It should illuminate with the ignition ON and engine not running to check the bulb and wiring FAULT STORAGE MEMORY This facility is included Intermittent fault detection will result in a code being set After a num ber of repeat vehicle journeys without a fault the code may be automatically deleted 6 DISPLAY CODES Carry out a basic inspection under the bonnet before proceeding ensuring t
4. 3 5 KO 80C A sensor simulator that can simulate resistance can be used to simulate the resistance value of the sensor and positively identify a defective sensor 3 AIR TEMPERATURE SENSOR This may be tested by connecting an ohms meter across the sensor and check ing against the typical values given below Typical Air Temperature Sensor Resistance Most systems Exceptions Cold 5KQ 500 Q 0 C Warm 2 5 KQ 2000 200C Exceptions KE L LE2 and LE3 Jetronic Lucas P Digital The sensor is intended for fine tuning the petrol air mixture Therefore dynamic tests while observing the injection duration are inconclusive The use of a Sensor Simulator to simulate extreme temperature variations is useful to show the injection duration can be affected by air temperature and there fore that the circuit is fully operational 4 THROTTLE SWITCH This is a switch which connects two terminals at idle or closed throttle and connect two other terminals when the throttle is open At idle A B connected Open throttle B C connected Gunson Fault Code Reader Typical throttle position switch Therefore to test a throttle switch connect an ohms meter across A B If the throttle is closed then there should be 0 ohms across A B With the throttle open the reading should be open circuit or infinity Connect the ohms meter across B C Vary the throttle positions and the opposite should be true Throttle closed Ato B 0 closed circuit
5. Typical throttle switch resistance Throttle open A to B infinity open circuit Throttle closed B to C infinity open circuit Throttle open B to C 0 closed circuit 5 THROTTLE POTENTIOMETER This is variable resistor with a reference voltage supplied to the resistor As the throttle position changes the voltage on the output of the potentiometer varies This voltage informs the ECU of the exact position of the throttle In some cases the ECU measures the rate of change of throttle position and so a clean potentiometer track can be very important A Variable Voltage 0 5 to 4 5v B C Resistor fixed 3K 10K Q Typical throttle potentiometer To test the throttle potentiometer disconnect the connector to the sensor and connect an ohms meter to terminals B and C This is usually the fixed resistance of the potentiometer A resistance of between 3k 10k should be observed Re connect the ohms meter to terminals A and B A resistance of 0 Ik to 5k IOk should be observed between throttle closed and throttle open From throttle closed slowly open the throttle observing the steady change in resistance A rapid change in resistance or an open closed circuit reading indicates a faulty sensor To further test the sensor reconnect the connector to the sensor and start the engine Connect a voltage meter between terminal A and earth Observe the voltage at idle Slowly open the throttle observing the change in voltage The vol
6. this product can involve working on a car while the engine is running This is a potential hazard and the user should take every precaution to avoid any possibility of damage or injury 2 HOW FAULT CODES MAKE IT EASY Modern vehicles have electronic control units that are able to identify and remember faults which occur in the vehicle s equipment This system was introduced on the higher specification electronic fuel injection vehicles around 1986 and was applied to other types of ECU a little later ABS and Ignition Its application is now virtually universal to all petrol engine vehicles This is a great benefit to service and maintenance personnel as it can considerably simplify vehicle repair The vehicle faults are stored in the vehicle s Electronic Control Unit ECU as Fault Codes The system is so simple that retrieving vehicle fault codes does not require particular skill However in order to read these fault codes some equipment is necessary E g a Fault Code Reader which is used to instruct the vehicle s ECU to download fault codes and or present them to the user on a display By far the most common system is to present the code as a blink code The Fault Code Reader will activate that part of the OBD programme which identifies the defective component and cause a code to be displayed usually by a light on the Fault Code Reader or by an instrument panel Check Engine light These provide a series of pulses to simply count a cod
7. Gunson for Petrol Engines Citroen Peugeot PART NO G4154 HANDBOOK Gunson Fault Code Reader Gunson Fault Code Reader Fault Code Reader for Petrol Engines Citroen Peugeot For vehicles with fuel injection or electronic control units INDEX Contents Safety First 2 How Fault Codes make it easy 3 The Fault Code Reader 4 How to use the Fault Code reader 5 Connection 6 Display codes 7 Vehicle applications 8 Citroen Peugeot Fault Codes 9 Test procedure notes TPN 10 Common terms I I Warranty and customer service Page Gunson Fault Code Reader I SAFETY FIRST General safety guidelines to follow when working on vehicles Always operate the vehicle in a well ventilated area Do not inhale exhaust gases they are very poisonous Always make sure the vehicle is in park Automatic transmission or neutral manual transmission and that the parking brake is firmly set Block the drive wheels Always keep yourself tools and test equipment away from all moving or hot engine parts Treat high tension ignition components with respect remembering that electrical shocks can cause involuntary movement which may result in secondary injury Wear approved eye protection Never wear loose clothing that can catch in moving engine parts and always tie up or cover long hair Never lay tools on a vehicle battery You may short the terminals together causing harm to yourself the tools or the batt
8. c MP3 1 3 2 5 1 5 1 1 Fenix 3B amp 4 1993 Magneti Marelli G6 8P Mono Motronic MA3 0 Motronic MP3 2 MP5 1 Gunson Fault Code Reader MODELS YEAR SYSTEM Citroen 1991 Mono Jetronic Mono Motronic MA3 0 Magneti Marelli G6 11 Motronic MP3 I eee ex 1990 Motronic MI 3 MP3 I MP4 I Fenix IB 1989 Magneti Marelli G5 Single amp Multipoint Motronic MP3 l EBEN ee ees MP3 2 MP5 1 MP5 1 1 Fenix 3B amp 4 SAXO 1996 Mono Motronic MA3 I Motronic MP5 I Magneti Marelli 8p EHE od b bd 1991 Mono Jetronic Mono Motronic MA3 0 Motronic MI 3 MP3 I EE P MP3 2 MP5 I Magneti Marelli G5 G6 8P 8 CITROEN PEUGEOT FAULT CODES agua aad soe End oftest nn Air Temp sensor 4 Coolant Temp sensor TE Test pump circ P Throttle position sensoridie Referto TEN O a2 iste speed concrotvaie ReferseTPNTS 15 iie speed conrolvave Referto TEN 19 1 Lambda system contro EEN 2 Lambda system control ReferteTENS n__n EEN EO esbonfiterselenoid vae CCS s fome position sensorfullicad Referts TEN Bs Lambsda sensor heating control aT erkAmgeSemor
9. d The airflow can be varied by varying the engine speed Test the output of the airflow meter with the ignition on at idle at 1500 RPM at 3000 RPM and during a rapid acceleration and compare to typical values given below Ignition on 0 25v 0 5v 3 5v Idle 0 5v 1 5v 4 5v 5 0v 1500 RPM 0 7v 2v 5 0v 5 5v 3000 RPM l 1v 3v 6 7v Rapid Acceleration 3v 4 5v 28v Typical Air Flow sensor output Most systems give an increase in voltage with air flow rate but some systems give a fall in voltage Gradually increase engine speed from idle to 3000 RPM observing the voltage change If the voltage becomes Ov or 5v at any point repeat the test If the same result is obtained the resistive track of the airflow meter is damaged If the voltage stays at a value as the engine speed changes it indicates a sticking flap plate A sensor simulator that can simulate a varying voltage can be used to provide a voltage to the ECU to simulate the output of the airflow sensor and positive ly diagnose a faulty airflow meter 2 COOLANT TEMPERATURE SENSOR This should be tested by an ohms meter when the engine is cold and also when warm with any connections to the sensor disconnected The results should be checked against manufacturer s specifications or typical values as 12 Gunson Fault Code Reader given overleaf Typical Coolant Temperature Sensor Resistance Most systems Exception KE Jetronic EECIV Cold 3 5 K O 50K Q 15eC Warm 300 400 Q
10. d then 5 more pulses 3 R 1o d dX X 2 5 25 Gunson Fault Code Reader In practice the Fault Code Reader code will be output as a series of numbers one after the other and the user has to recognise individual numbers and recognise the gaps between numbers This is made easy by the fact that the pause between two numbers is much greater than the pause between the individual digits of a number Similarly there is an even greater pause between one series of code numbers egg representing current faults and another series of code numbers e g representing faults stored in memory To make matters even easier the ECU in most instances repeats a series of code numbers so that the user has the opportunity to check the reading Each code has a particular meaning which is identified by reference to the tables of Fault Codes which follow GENERAL NOTES Before connecting the Fault Code Reader to the car the user should ensure that the TEST SWITCH is set to O and the diagnostic socket has been correctly identified Check that the car ignition is off the car is out of gear and that the handbrake is applied When a fault code appears it does not necessarily mean that the component indicated is faulty It could mean that the ECU has received a signal from the component or it s wiring which is outside specification Therefore before tests are performed using the Test Procedure Notes later in this Manual it is important
11. e number Systems with an instrument panel Check engine light are able to illuminate this when the engine is running to warn of faults other systems are more secretive and need to be interrogated The Fault Code Reader is an economical but very effective product It is available for a wide range of vehicles and enables the user to instruct the vehicle to download stored fault codes Having obtained the fault codes the user then identifies the nature of faults by referring to a list of code numbers Comprehensive lists of code numbers are included in this handbook 5 Gunson Fault Code Reader NB Car manufacturers have in the past used a connector type unique to their own cars Many manufacturers have used different types of connector at various times Only recently have there been moves to standardise to a 16 pin socket Makes and models of car also vary in the degree of testing and fault diagnosis that is possible In general the ECU will identify faults that exist at the time of the test but the ECU may also have a memory that remembers faults that have occurred in the recent past and these can also be read out from memory using the Fault Code Reader For instance in some vehicles the readout consists of the faults that are present at that time followed after a separator code by the codes that are held in memory from some previous time In most vehicles tests are carried out with the engine off but ignition on Occasio
12. ery When carrying out tests on a motor vehicle remember NEVER run the engine with the car battery disconnected either or since the alternator would then run at a damaging over voltage Never smoke or have open flames near vehicle Vapours from gasoline and charging battery are highly flammable and explosive Always keep a suitable fire extinguisher handy Never leave vehicle unattended while running tests Keep children and animals out of the area Always turn ignition key OFF when connecting or disconnecting electrical components unless otherwise instructed Always follow vehicle manufacturer s warnings cautions and service procedures CAUTION Some vehicles are equipped with safety air bags You must follow vehicle service manual cautions when working around the air bag components or wiring If the cautions are not followed the air bag may open up unexpectedly resulting in personal injury Note The air bag may still open up several minutes after the ignition key is off or even if the vehicle battery is disconnected because of a special energy reserve module Gunson Fault Code Reader Precautions to be followed when using the Fault Code Reader Before connecting the leads ensure that the correct connector of the car has been identified Using this product may cause vehicle systems to self test items such as coolant fans to suddenly start with no warning and engine speed to suddenly increase Using
13. hat all leads and connectors are secure and the ignition is turned off TEST PROCEDURE I Set the Code Reader switch to the O position and connect the Code Scanner to the diagnostic socket Fig I 2 Turn on the ignition ON but do not start the engine 3 Set the Code Reader switch in the I position for a period of approximately three seconds then return it to the 0 position After about five seconds the Test Start code will be transmitted as a series of pulses reading code 12 PULSE PAUSE PULSE PULSE 4 After a further five seconds the LED will extinguish 5 Set the switch into the I position again for three seconds and then return to the 0 position the LED will now come on After about five seconds the next code will be transmitted 6 If the code is code I I PULSE PAUSE PULSE this denotes the end of the test sequence with no faults registered therefore proceed to 6 If any other code is transmitted there is a fault continue to 5 below 9 Gunson Fault Code Reader 7 Wait for five seconds and the Code Reader LED will extinguish if a fault code was transmitted set the switch into the I position again for three seconds and then return to the 0 position After about five seconds a further fault code may be transmitted 8 This switch sequence must be repeated until code I I end of test is transmitted 9 The test can be repeated in order to confirm any codes or terminated by switching off the ignition and disconnect
14. he hot wire and the greater the flow the greater the cooling effect A control unit which regulates the temperature of the hot wire provides a voltage signal to the ECU relative to the air flow To test a mass air flow sensor probe the airflow meter connector with a voltage meter until the sensor output is identified The output will be a voltage of 0 5v to 4 5v or 4 5v to 9v This voltage changes as the air flow is varied The airflow can be varied by varying the engine speed Test the output of the airflow meter with the ignition on at idle at 1500 RPM at 3000 RPM and during a rapid acceleration and compare to the typical values below Ignition on 0 25v 0 5v Idle 0 5v 1 5v 1500 RPM 0 7v 2v 3000 RPM I 1v 3v Rapid Acceleration 3v 4 5v Typical Air Flow sensor output Some systems produce a fall in the output voltage relative to an increase in air flow A sensor simulator can be used to provide a voltage to the ECU to 15 Gunson Fault Code Reader simulate the output of the airflow sensor and positively diagnose a faulty airflow meter 8 PETROL TEMPERATURE SENSOR This measures the fuel temperature in the fuel manifold pipe If the temperature exceeds 90C the ECU will enrich the mixture by increasing the injection duration as fuel evaporation is likely above 90C 9 LAMBDA OR OXYGEN SENSOR This sensor is positioned in the exhaust system It provides a voltage signal to the ECU which is used to vary the injection duration to
15. ing the Code Reader Reference should be made to the Fault Code Table to identify any codes and to assist in repair procedures CLEARING CODES AFTER CORRECTING ANY VEHICLE FAULTS When the end of the test procedure is indicated by the end of code I I there will be a pause of about five seconds and the LED will extinguish I Put the switch into the I position for about ten seconds Then put the switch into the 0 position and switch off the ignition 2 Perform the test procedure again to ensure that the fault codes have been deleted 3 Drive the vehicle sufficient to warm the engine fully and then operate it under a variety of part and full load conditions 4 Perform the test procedure again to ensure that the fault codes have not been reset 7 VEHICLE APPLICATIONS APPLICATIONS Peugeot vehicles with petrol engines and electronic injection systems These instructions only apply to the vehicles fitted with an ECU fault diagnostic system with a blink code output and a check engine light on the instrument panel Manufacturer MODELS YEAR SYSTEM 1991 Magneti Marelli G6 8P Mono Motronic MA3 0 Motronic MP3 I 1993 Mono Jetronic Magneti Marelli G5 G6 Mono Motronic MA3 0 Motronic MI 3 1988 Mono Jetronic Magneti Marelli G5 G6 Motronic MI 3 ML4 1 1987 lt Magneti Marelli G5 G6 8PL AP Mono Motronic MA3 0 Motronic MI 3 MP3 1 MP3 2 ML4 I MP5 I 1990 lt Magneti Marelli G5 single amp multipoint Motroni
16. maintain an air fuel ratio of 14 parts air to I part of fuel A Lambda sensor tester is required to test the operation of this sensor On vehicles with a catalytic converter the Lambda sensor is essential as the sensor enables the ECU to maintain an oxygen content of about 2 in the exhaust The catalytic converter requires the 2 of oxygen to perform its function 10 VALVES The ECU uses valves in the fuel system to pass or restrict fuel or gases according to engine load conditions Use the relay test to ensure that the ECU is actuating the valve Valves are mechanical devices which can be sticking or jammed therefore removal and testing when removed from the vehicle may be required Gunson Fault Code Reader 10 COMMON TERMS Many abbreviated terms are peculiar to a particular manufacturer and are explained in the relevant text Some more common or universal ones appear below COMPUTER SYSTEMS ECU OBD ELECTRONIC CONTROL UNIT These units may control a separate function for example fuel injection ignition ABS Modern systems tend to be more multi function as this saves cost wiring complications and ensures greater resistance to interference and more control over emitted interference ON BOARD DIAGNOSTICS The facility provided by modern ECU s to self diagnose and report faults in the ECU sensors wiring connections etc Fault codes are used to differentiate faults KEEP ALIVE MEMORY A system for maintaining a record
17. nally additional tests may be carried out with the engine running this depends on the sophistication of the ECU and is not available on all makes of vehicle Having identified the fault codes and eliminated the faults the user may then wish to erase the faults from the ECU s memory With some cars this is possible using a special sequence of operations or a sequence of switch operations on the Fault Code Reader With other vehicles this is not possible and it may be necessary to erase the memory by disconnecting the battery connection with engine not running this has the disadvantage that codes for radio security system and also some ECU memory settings are temporarily lost Fault codes generally disappear anyway after the fault has not been present for a certain number of engine start cycles but deletion of the codes followed by a short drive has the advantage that it allows the operator to check if the fault has truly been rectified This is confirmed if the code does not re occur Before using this product or indeed carrying out any vehicle maintenance the user is recommended to read the precautions presented in later sections of this manual In particular note that during the use of this product the vehicle s On Board Diagnostic programme OBD takes control of the vehicle and may activate various vehicle systems such as turning on the cooling fan this can constitute a safety hazard and the user should keep fingers clear duri
18. ng tests Gunson Fault Code Reader 3 THE FAULT CODE READER Fault Code Reader is complete with the connections for the vehicle listed on the packaging It is not suitable for use on any other vehicle INSTRUCTIONS FOR USE please read carefully and it will help you to use the product and interpret the information it can provide TEST SWITCH Labelled 0 and I Moving from 0 to 1 starts a test or changes the way the vehicle s Electronic Control Unit ECU functions LED CODE INDICATOR If fitted will transmit Fault Finder pulses which represent the fault codes On models where this is not fitted the pulses will generally be seen on the engine check light on the vehicle instrument panel 4 HOW TO USE YOUR FAULT CODE READER NUMBER CODE IDENTIFICATION Identifying fault codes is in fact very easy and simple though it may seem complicated at a first reading the user will soon get accustomed to the technique Basically the ECU communicates with the Code Reader in a series of pulses and the user simply counts these pulses to identify particular numbers For example the number 6 would be transmitted as 6 pulses in rapid succession If we use the symbol to indicate a pulse then the number 6 will be transmitted as 7 o 2 23 6 If the number is a 2 digit number then each digit is transmitted separately For example the number 25 would be represented as 2 pulses followed by a brief pause an
19. of faults encountered to be accessed later These may be intermittent or recorded only under particular conditions and therefore not accessible during no load testing IGNITION DIS EDIS CID RON DISTRIBUTOR LESS IGNITION SYSTEM These use one coil per cylinder or an arrangement which provides one coil per two cylinders and sparks every rotation of the engine instead of every two rotations wasted spark The net result is that H T voltages do not have to be mechanically distributed Together with ignition advance mapping in the ECU this provides a high reliability and performance ELECTRONIC DISTRIBUTOR LESS IGNITION SYSTEM CYLINDER IDENTIFICATION SIGNAL Determines which cylinder is not only receiving a spark but is also on the compression stroke Defines the OCTANE NUMBER of petrol Multiple position plug socket arrangements allow ignition requirements to be changed for different rated fuels e g octane multiplug Gunson Fault Code Reader INJECTION FUEL LAMBDA SENSOR See EGO and HEGO sensors EGO EXHAUST GAS OXYGEN SENSOR Sensitive to low concentrations of oxygen in hot exhaust gas Essential for accurate feedback control of injection HEGO HEATED EGO SENSOR MAP MANIFOLD ABSOLUTE PRESSURE SENSOR Manifold pressure sensor measures differential pressure with vacuum sealed capsule not atmospheric pressure MAF MANIFOLD AIR FLOW SENSOR Vane or hot wire flow sensor SENSORS GENERAL
20. ols Distributed by The Tool Connection Ltd Kineton Road T 44 0 1926 815000 T TOOL Southam F 44 0 1926 815888 J CONNECTION Warwickshire info toolconnection co uk CV47 ODR www toolconnection co uk
21. tage is typically O 5v to 4 5v A rapid change in the voltage or a loss of the 14 Gunson Fault Code Reader voltage indicates a faulty sensor If the sensor is not producing a producing a voltage or the tests are inconclusive the use of a sensor simulator to simulate the sensor output should be used to provide a voltage to the ECU If symptoms persist while using a Sensor Simulator then the fault is not with the Throttle Position sensor If the system works correctly while the sensor is being simulated replaced the sensor is positively identified as faulty 6 MANIFOLD ABSOLUTE PRESSURE SENSOR This produces a voltage of 0 5 to 4 5v dependant upon the pressure vacuum in the inlet manifold The connector usually has three terminals Use a voltage meter to identify the 5 volt supply the ground and the output voltage of the sensor Test the response of the sensor output relative to engine speed as for 1 If there is little or no response disconnect the vacuum pipe from the sensor and apply a vacuum directly to the sensor If the voltage now varies check the vacuum pipe for leaks or blockages If the voltage does not vary with a direct vacuum it is likely that the sensor is defective To positively identify the MAP sensor as faulty use a Sensor Simulator to simulate the output of the sensor 7 MASS AIR FLOW SENSOR This is a hot wire positioned in the air stream The air flow through the air intake has a cooling effect on t
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