Fault interpretation
| DF001 PRESENT OR STORED | COOLANT TEMPERATURE SENSOR CIRCUIT CC.0: Short circuit to earth |
INSTRUCTIONS
Conditions for applying the diagnosis for a stored fault:
If the fault is reported as present when the ignition is switched on (+ after ignition) or with the engine running
Special features:
If the fault is reported as present:
- the coolant temperature: PR064 "Coolant temperature" is frozen at 119 °C,
- the preheating time is greater than 10 seconds,
- the cooling fan unit switches to permanent control,
The severity 1 warning lamp is on.
Use terminal block Elé. 1681 for any work on the ECU connectors.
CC.0
INSTRUCTIONS
Without.
| Check the connector of the coolant temperature sensor. Repair if necessary. |
| Measure the resistance of the coolant temperature sensor between terminals 2 and 3 of its black connector. Replace the sensor if its resistance is not: 12460 ± 112 Ω at -10 °C |
| Check the connector of the injection ECU. Check continuity and ensure insulation of the following links: Brown 48-way connector B, injection ECU pin F2 → Pin 3 of coolant temperature sensor Repair if necessary. |
| If the fault persists and remains present, replace the coolant temperature sensor. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CO.1
INSTRUCTIONS
Without.
| Check the connector of the coolant temperature sensor. Repair if necessary. |
| Measure the resistance of the coolant temperature sensor between terminals 2 and 3 of its black connector. Replace the sensor if its resistance is not: 12460 ± 112 Ω at -10 °C |
| Check the connector of the injection ECU. Check continuity and ensure insulation of the following links: Brown 48-way connector B, injection ECU pin H1 → Pin 2 of coolant temperature sensor Repair if necessary. |
| If the fault persists and remains present, replace the coolant temperature sensor. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF003 PRESENT OR STORED | ATMOSPHERIC PRESSURE SENSOR CIRCUIT 1.DEF: Signal above upper limit |
INSTRUCTIONS
Conditions for applying the diagnosis for a stored fault:
The fault is declared present following:
- clearing of the fault memory,
- switching off the ignition with loss of communication with the diagnostic tool,
- switching on the ignition with communication re-established with the diagnostic tool,
- engine start followed by a 30-second delay with the engine running.
Priority in handling multiple faults (for 1.DEF or 2.DEF):
Apply the handling of fault "DF015: Main relay control circuit" first if it is present or stored.
Special features:
The atmospheric pressure sensor is integrated into the injection ECU and cannot be separated from it.
If the fault is present:
- a slight smoke is present,
- the atmospheric pressure value switches to fallback mode PR035 "Atmospheric pressure" 750 mbar,
- the severity 1 warning lamp is on.
Use terminal block Elé. 1681 for any work on the ECU connectors.
| 1.DEF 2.DEF | Check the power supply and earth of the injection ECU. Check parameter PR035 "Atmospheric pressure" and make sure it is the same on another vehicle (approximately 1000 mbar). Contact your Techline before replacing the injection ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
3.DEF
INSTRUCTIONS
Priority in handling multiple faults: Apply the handling of fault "DF004: Boost pressure sensor circuit" first if it is present or stored.
Check the power supply and earth of the injection ECU.Check parameter PR035 "Atmospheric pressure" together with parameter PR042 "Filtered boost pressure".
If the difference exceeds ± 20 hPa (20 mbar), go to the diagnosis of PR042 "Filtered boost pressure".
If the fault persists, contact your Techline before replacing the injection ECU.
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF004 PRESENT OR STORED | BOOST PRESSURE SENSOR CIRCUIT CO.0: Open circuit or short circuit to earth |
INSTRUCTIONS
Condition for applying the diagnosis for a stored fault:
The fault is reported as present following switching on the ignition or with the engine running.
Special features:
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
If the fault is present:
- the exhaust gas recirculation valve is switched off,
- the boost pressure switches to degraded mode, i.e. PR042 = 750 mbar,
- the intake air temperature switches to degraded mode, i.e. PR059 = 25 °C.
The severity 1 warning lamp will be on.
CO.0
INSTRUCTIONS
Without.
Check the connector of the boost pressure sensor.Check the connector of the injection ECU.
Repair if necessary.Injection ECU connector B, brown 48-way, pin K2 → Pin 3 of boost pressure sensor connector
Injection ECU connector B, brown 48-way, pin G4 → Pin 1 of boost pressure sensor connector
Repair if necessary.
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CC.1
INSTRUCTIONS
Without.
| Check the connector of the boost pressure sensor. Check the connector of the injection ECU. Repair if necessary. |
| Make sure continuity and insulation of the following links: Injection ECU connector B, brown 48-way, pin D4 → Pin 2 of boost pressure sensor connector Repair if necessary. |
| If the fault persists, replace the boost pressure sensor. |
1.DEF
INSTRUCTIONS
Check the consistency of parameter PR064 "Engine coolant temperature":
- replace the coolant temperature sensor if its signal drifts.
| If DF003 is also present, carry out diagnosis of PR042 "Filtered boost pressure". If the boost pressure sensor is within specification, contact your techline before replacing the ECU. |
| Check the connector of the boost pressure sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU brown connector B, 48-way, pin G4 → Pin 1 boost pressure sensor connector Repair if necessary. If the fault persists, contact your techline before replacing the ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF005 PRESENT OR STORED | ENGINE SPEED SENSOR CIRCUIT 1.DEF: No signal |
INSTRUCTIONS
Conditions for applying diagnosis on a stored fault: If the fault is reported present during successive starts or with the engine running.
Particularities: Use terminal block Elé. 1681 for any work on the ECU connectors.
The engine speed sensor is consistent with the camshaft sensor.
If the fault is present, the severity 2 warning lamp is on.
1.DEF 2.DEF
INSTRUCTIONS
Without.
| Check the connector of the top dead centre sensor. Repair if necessary. |
| Check that the air gap between the sensor and the flywheel is correct: 0.5 to 1.8 mm. |
| Measure the resistance of the top dead centre sensor between pins A and B of its black connector. The coil resistance is 800 ± 80 Ω at an engine temperature of 20 °C. |
| Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU brown connector B, 48-way, pin B1 → Pin A top dead centre sensor Repair if necessary. |
| Check the top dead centre sensor signal using an oscilloscope. If abnormal, check that the sensor is securely fitted and that the flywheel target is not damaged. |
| If the fault persists, contact your techline before replacing the ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF007 PRESENT OR STORED | RAIL PRESSURE SENSOR CIRCUIT CC.0: Short circuit to ground |
INSTRUCTIONS
Conditions for applying diagnosis on a stored fault: If the fault is reported present during successive starts or with the engine running.
Particularities: An immediate engine stop request will be issued if the fault is present.
The severity 2 fault warning lamp will be on.
Use terminal block Elé. 1681 for any work on the ECU connectors.
CC.0
INSTRUCTIONS
Without.
| Check the connector of the rail pressure sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity and insulation of the following connections: Injection ECU brown connector B, 48-way, pin G3 → Pin 2 rail pressure sensor Repair if necessary. |
| If the problem persists, replace the rail pressure sensor and tighten it to 35 ± 5 N.m, observing the safety instructions in the "Preliminary" chapter. |
CO.1
INSTRUCTIONS
Without.
| Check the connector of the rail pressure sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity and insulation from +12 V between the connections: Injection ECU brown connector B, 48-way, pin G3 → Pin 2 rail pressure sensor Repair if necessary. |
| If the problem persists, replace the rail pressure sensor, tighten it to 35 ± 5 N.m, and observe the safety instructions in the "Preliminary" chapter. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
1.DEF 2.DEF
INSTRUCTIONS
Particularity: The minimum value is 0.2 bar; the maximum stop value is 1350 bar.
| Check the connector of the rail pressure sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU brown connector B, 48-way, pin G3 → Pin 2 rail pressure sensor Repair if necessary. |
| Ignition on, engine stopped for more than one minute: Check the pressure value displayed by diagnostic tool PR038 "Rail pressure" in the tab "Fuel/LPG circuit - Engine control function",
In this case, contact your techline before replacing the ECU.
Observe the safety instructions in the "Preliminary" chapter. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF008 PRESENT OR STORED | ACCELERATOR PEDAL POTENTIOMETER TRACK 1 CIRCUIT CO.0: Open circuit or short circuit to earth |
INSTRUCTIONS
Conditions for applying diagnosis on a stored fault: the fault is declared present following a series of accelerator pedal actions - pedal fully pressed, pedal released.
Particularities: Boost and cruise control are not permitted.
The severity 1 warning lamp is on.
Engine speed is limited to 1400 rpm if there is a dual fault on tracks 1 and 2.
Use terminal block Elé. 1681 for any work on the ECU connectors.
CO.0
INSTRUCTIONS
Priority when handling multiple faults: If the fault "DF009: Pedal potentiometer track 2 circuit" is also present, check that the pedal sensor connector is correctly connected.
| Check the connector of the pedal sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU black connector A, 32-way, pin H2 → Pin 4 pedal sensor connector Repair if necessary. |
| Measure the resistance of pedal sensor track 1 between pins 5 and 3. Replace the sensor if the resistance is not 1.7 kΩ ± 0.9. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CC.1
INSTRUCTIONS
Priority when handling multiple faults: Apply the procedure for "DF011: Sensor supply voltage no. 1" first if it is present or stored.
| Check the connector of the pedal sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU black connector A, 32-way, pin H2 → Pin 4 pedal sensor connector Repair if necessary. |
| Measure the resistance of pedal sensor track 1 between pins 5 and 3. Replace the sensor if the resistance is not: 1.7 kΩ ± 0.9 |
1.DEF
INSTRUCTIONS
None
| Check the connector of the pedal sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: 32-pin black connector A, injection ECU pin H2 → pedal sensor connector pin 4 Repair if necessary. |
| If the fault persists, replace the pedal sensor. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF009 PRESENT OR STORED | ACCELERATOR PEDAL POTENTIOMETER TRACK 2 CIRCUIT CO.0: Open circuit or short to ground → CC.1: Short to +12 V → 1.DEF: Signal inconsistency |
INSTRUCTIONS
Conditions for applying the diagnosis on a stored fault: The fault is declared present following a series of accelerator pedal actions – fully pressed, then released.
Particularities: Boost and cruise control are not permitted.
The severity 1 warning lamp is on.
Engine speed is limited to 1400 rpm if there is a dual fault on tracks 1 and 2.
Use terminal block Elé. 1681 for any work on the ECU connectors.
CO.0
INSTRUCTIONS
Priorities when handling multiple faults: If fault DF008 (Pedal potentiometer track 1 circuit CO.0) is also present, check that the pedal sensor connector is correctly connected.
| Check the connector of the pedal sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: 32-pin black connector A, injection ECU pin F3 → pedal sensor connector pin 1 Repair if necessary. |
| Measure the pedal sensor resistance on track 2 between pins 2 and 6. Replace the sensor if the resistance is not: 2.85 kΩ ± 2.05. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CC.1
INSTRUCTIONS
Priority when handling multiple faults: Apply the treatment for fault "DF012: sensor power supply no. 2 voltage" first if it is present or stored.
| Check the connector of the pedal sensor. Check the connector of the injection ECU. Repair if necessary. |
| Repair if necessary. Check continuity, the absence of parasitic resistance and the insulation of the following links: 32-pin black connector A, injection ECU pin F3 → pedal sensor connector pin 1 Repair if necessary. |
| Measure the pedal sensor resistance on track 2 between pins 2 and 6. Replace the sensor if the internal resistance is not: 2.85 ± 2.05 kΩ. |
1.DEF
INSTRUCTIONS
Without.
| Check the connector of the pedal sensor. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: 32-pin black connector A, injection ECU pin F3 → pedal sensor connector pin 1 Repair if necessary. |
| If the fault persists, replace the pedal sensor. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF010 PRESENT OR STORED | EGR POSITION SENSOR CIRCUIT CO.0: Open circuit or short to ground |
INSTRUCTIONS
Condition for applying the diagnosis on a stored fault: If the fault reappears following:
- clearing of the fault memory, and
- actuator control "AC002: EGR solenoid valve".
Special features:
If the fault is present:
- presence of smoke from the exhaust,
- exhaust gas recirculation is deactivated.
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
CO.0
INSTRUCTIONS
Without.
| Check the connector of the exhaust gas recirculation valve. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU connector B brown 48-pin pin J2 → EGR valve pin 6 Repair if necessary. |
| If the fault persists, replace the exhaust gas recirculation valve. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CC.1
INSTRUCTIONS
Priority when handling multiple faults: Apply the treatment for fault "DF012: sensor power supply no. 2 voltage" first if it is present or stored.
| Check the connector of the exhaust gas recirculation valve. Check the connector of the injection ECU. Repair if necessary. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU connector B brown 48-pin pin J2 → EGR valve pin 6 Repair if necessary. |
| If the fault persists, check that the exhaust gas recirculation valve is not jammed. Display the feedback parameter "PR051: EGR valve position feedback": If its value is not between 0.75 V and 1.6 V:
|
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF011 PRESENT OR STORED | SENSOR POWER SUPPLY NO. 1 VOLTAGE 1.DEF: Sensor reference voltage too low |
INSTRUCTIONS
Condition for applying the diagnosis for a stored fault:
The fault reappears following:
- clearing of the fault,
- a 1-minute delay with the engine running.
Special features:
If the fault is present:
- cruise control is deactivated,
- engine torque is limited,
- the severity 1 warning lamp is on.
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
1.DEF 2.DEF
INSTRUCTIONS
Without.
The sensors connected to power supply no. 1 are as follows:
To locate the possibly faulty sensor and/or wiring, disconnect one of these sensors, then check whether the fault becomes stored. If the fault remains present, repeat the operation with the other sensor. (Wait a few seconds between each disconnection so the ECU can take its measurement.) If, following a disconnection, the fault becomes stored, replace the faulty sensor or repair its wiring (use the Technical Note "wiring diagrams" for the vehicle). Clear the faults created by the multiple disconnections. |
If, with these sensors disconnected, the fault is still present:
If these checks reveal a fault, carry out the necessary repairs. |
| If the fault persists, carefully examine the engine control ECU connector (look for conductive particles and bent pins). If the fault persists, contact your technical helpline before replacing the engine control ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF012 PRESENT OR STORED | SENSOR SUPPLY VOLTAGE NO. 2 1.DEF: Sensor reference voltage too low |
INSTRUCTIONS
Conditions for applying the stored fault diagnosis: The fault reappears stored after:
- clearing of the fault,
- a 1-minute delay with the engine running.
Special features:
If the fault is present:
- severity 1 warning lamp is on,
- EGR control, cruise control and positive temperature coefficient (P.T.C.) resistors are disabled,
- torque is limited,
- the severity 1 warning lamp is on.
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
1.DEF 2.DEF
INSTRUCTIONS
None
The sensors connected to supply No. 2 are as follows:
To locate the possible faulty sensor and/or wiring, disconnect one of these sensors then check whether the fault becomes stored. If the fault remains present, repeat the operation with the other sensors (one at a time). (Wait a few seconds between each disconnection so that the ECU can take its measurement). If, following a disconnection, the fault becomes stored, replace the faulty sensor or repair its wiring. (Use the vehicle's "Wiring diagrams" Technical Note). Clear the faults created by the multiple disconnections. |
If, with these three sensors disconnected, the fault is still present:
If these checks reveal a fault, carry out the necessary repairs. |
| If the fault persists, carefully examine the engine control ECU connector (look for conductive particles and bent pins). If the fault persists, contact your technical helpline before replacing the engine control ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF013 PRESENT OR STORED | SENSOR SUPPLY VOLTAGE NO. 3 1.DEF: Sensor reference voltage too low |
INSTRUCTIONS
Conditions for applying the stored fault diagnosis: The fault reappears stored after:
- clearing of the fault,
- a one-minute time delay with the engine running.
Special features: If the fault is present:
- "EGR" control is disabled,
- vehicle performance is limited,
- the severity 2 warning lamp will be on.
Use terminal block Elé. 1681 for any work on the engine control module connectors
1.DEF 2.DEF
INSTRUCTIONS
Without.
The sensors connected to supply No. 3 are as follows:
To locate the possible faulty sensor and/or wiring, disconnect one of these sensors then check whether the fault becomes stored. If the fault remains present, repeat the operation with the other sensor. (wait a few seconds between each disconnection so that the ECU can take its measurement). If, following a disconnection, the fault becomes stored, replace the faulty sensor or repair its wiring. (use the vehicle's "Wiring diagrams" Technical Note). Clear the faults created by the multiple disconnections. |
| If, with two sensors disconnected, the fault is still present: check the insulation to earth of the +5 V line of each of these sensors. check the insulation to +12 V of the +5 V line of each of these sensors. check the insulation between the following wires:
If these checks reveal a fault, carry out the necessary repairs. |
| If the fault persists, carefully examine the engine control ECU connector (look for conductive particles and bent pins). If the fault persists, contact your technical hotline before replacing the engine control module. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF015 PRESENT OR STORED | MAIN RELAY CONTROL CIRCUIT 1.DEF: Relay switched off too early |
INSTRUCTIONS
Conditions for applying the stored fault diagnosis: The fault reappears after it has been erased, a power-off until the end of the power latch (anti-theft indicator flashing), followed by switching the ignition back on with communication established.
Special features: The main relay is integrated into the protection and switching unit (P.S.U.).
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
1.DEF 2.DEF
INSTRUCTIONS
Without.
| Carry out a check of the connectors of the protection and switching unit (P.S.U.). Check the connector of the injection ECU. Repair if necessary. |
| Check that the battery terminals are tight and that the engine earth is correctly connected. |
| Check continuity, absence of parasitic resistance and insulation of the following wiring: Injection ECU connector B brown 48-way pin E1 → Connector D brown protection and switching unit pin D2 Repair if necessary. |
| If the fault persists and remains present, refer to the Technical Note for the protection and switching unit (P.S.U.). IMPORTANT: If the protection and switching unit no longer detects the frames from the injection ECU, cooling fan unit 1 will be switched on until the battery is completely discharged. If cooling fan unit 1 is faulty, cooling fan unit 2 will then be activated. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF016 PRESENT OR STORED | EGR CONTROL CIRCUIT CC.1: Short circuit to +12 V |
INSTRUCTIONS
Condition for applying the diagnosis on a stored fault: If the fault reappears following:
- clearing of the fault memory, and
- Actuator control AC002 "EGR solenoid valve".
Special features: Excessive smoke will be present and the exhaust gas recirculation valve and the turbocharger will be locked if the fault is present, and the severity 1 warning lamp will be on.
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
CC.1
INSTRUCTIONS
Without.
| Check the connector of the exhaust gas recirculation valve. Check the connector of the injection ECU. Repair if necessary. |
| Check the resistance of the exhaust gas recirculation valve solenoid between pins 1 and 5. If the resistance is not 8 Ω ±0.5 at 20°C, replace the exhaust gas recirculation valve. Check the continuity and insulation of the following wiring:Injection ECU connector B brown 48-way pin L2 → Pin 5 exhaust gas recirculation valve Repair if necessary. |
| If the fault persists and remains present, replace the exhaust gas recirculation valve. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CC.0 CO
INSTRUCTIONS
Special feature: If fault DF010 "EGR valve position sensor circuit" is present at the same time as CO.0, check that the exhaust gas recirculation valve connector is correctly plugged in.
| Check the connector of the exhaust gas recirculation valve. Check the connector of the injection ECU. Repair if necessary. |
| Check the resistance of the exhaust gas recirculation valve solenoid between pins 1 and 5. If the resistance is not approximately 8 Ω ±0.5 Ω at 20°C, replace the exhaust gas recirculation valve. Also check the insulation between the solenoid and the body of the exhaust gas recirculation valve. |
| Check the continuity, absence of parasitic resistance and insulation of the following wiring: Injection ECU connector B, brown 48-way pin L2 Check for +12 V after the protection and switching unit relay on pin 1 of the exhaust gas recirculation valve |
| Repair if necessary. If the fault persists and remains present, replace the exhaust gas recirculation valve. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
1.DEF
INSTRUCTIONS
None
| Check the connector of the exhaust gas recirculation valve. Check the connector of the injection ECU. Repair if necessary. |
| Check the resistance of the exhaust gas recirculation valve solenoid between pins 1 and 5. If the resistance is not approximately 8 Ω ±0.5 at 20°C, replace the exhaust gas recirculation valve. |
| Check continuity, absence of parasitic resistance and insulation of the following connections: Injection ECU connector B brown 48-way pin L2 → Pin 5 EGR valve Check for +12 V after relay on circuit 1 of the exhaust gas recirculation (EGR) valve. Repair if necessary. |
If the fault persists, check the ECU output stage. Run actuator command AC002 "EGR solenoid valve". If no valve movement can be felt, check the ECU output stage:
EGR valve connected: connect the oscilloscope ground to battery ground and the positive probe to pin 5 of the EGR valve. Clear any EGR valve fault, then run command "AC002": The oscilloscope must show a square wave with an amplitude of 12.5 V at a frequency of 140 Hz (with the Duty Cycle varying from 25% to 75%).
EGR valve connected: connect the voltmeter ground lead to pin 2 of the EGR valve and the positive lead to pin 1. Clear any EGR valve fault, then run command "AC002". The voltmeter must show two successive voltages approximately equal to the battery voltage multiplied by the current Duty Cycle. Successively: 3.15 V for a Duty Cycle of 25%, then 9.45 V for a Duty Cycle of 75% (ten cycles). If the oscilloscope (or voltmeter) shows no control signal or a DC voltage, contact your technical support line before replacing the injection ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF017 PRESENT OR STORED | GLOW PLUG CONTROL MODULE CIRCUIT CC.1: Short circuit to +12 V → CC.0: Short circuit to ground → CO: Open circuit → 1.DEF: Internal electrical fault |
INSTRUCTIONS
Conditions for diagnosis on stored fault: If the fault becomes present following actuator command AC001 "Glow plug control module".
Special notes: If the fault is present, the vehicle is difficult or even impossible to start when cold.
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
CC.1
INSTRUCTIONS
Without.
| Check the connectors of the glow plug control module and the glow plug supply cables. Check the connector of the injection ECU. Repair if necessary. |
| Check the condition of supply fuse F (70 A). Make sure there is continuity and no short to +12 V on the following connection: Injection ECU connector C, grey 32-way, pin E2 → Pin 8 of glow plug control module Repair if necessary. |
| If the fault persists, replace the glow plug control module. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
CC.0 CO
INSTRUCTIONS
Special notes: If the control module is shorted to ground, the glow plugs may be energised permanently, with a risk of engine damage.
| Check the connectors of the glow plug control module and the glow plug supply cables. Check the connector of the injection ECU. Repair if necessary. |
| Check the condition of supply fuse F (70 A). Check continuity, absence of parasitic resistance and isolation of the following connection: Injection ECU connector C, grey 32-way, pin A4 → Pin 8 of glow plug control module Repair if necessary. |
| If the fault persists, replace the glow plug control module. |
1.DEF
INSTRUCTIONS
Without.
| Check the connectors of the glow plug control module and the glow plug supply cables. Check the connector of the injection ECU. Repair if necessary. |
| Check the condition of supply fuse F (70 A). Check continuity and isolation of the following connection: Injection ECU connector C, grey 32-way, pin E2 → Pin 8 of glow plug control module Repair if necessary. |
| If the fault persists, check the ECU output stage. Glow plug control module connected: connect the voltmeter negative probe to pin 8 of the glow plug control module and the positive probe to battery +12 V. Run command AC002 "EGR solenoid valve". If the voltmeter does not show battery voltage for the whole duration of the command (ten ON-OFF cycles of one second), contact your technical support line before replacing the engine control ECU. |
AFTER REPAIR
Deal with any other faults. Clear the fault memory.
Switch off the ignition and carry out a road test, followed by a check with the diagnostic tool.
| DF025 PRESENT OR STORED | GLOW PLUG CONTROL UNIT DIAGNOSTIC LINK CC.0: Short circuit to earth |
INSTRUCTIONS
Condition for applying the diagnosis for a stored fault:
If the fault becomes present following actuator command AC001 "Glow plug control module".
Special notes: The vehicle is difficult or even impossible to start when cold.
Use terminal block Elé. 1681 for any work on the engine management ECU connectors.
CC.0 CO.1
INSTRUCTIONS
Without.
| Check the connectors of the glow plug control module. Check all glow plugs. Repair if necessary. |
| Check the glow plug resistance: replace any glow plug whose resistance is not 8 Ω ±0.5 Ω at 20 °C. Check continuity of the following connections: Glow plug control module pin 1 → glow plug |
Test yourself
A quick Renault Megane quiz: every answer comes with an explanation and a link to the manual page.