Page 129 of 363
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 2 LH side illuminatedFiche n° 27 side 1/2
COMPUTER CIRCUIT
XR25 aid:Computer faulty
2
NoneNOTES
The computer is incorrect or faulty.
Replace the computer.
17-84
Page 130 of 363
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 2 RH side illuminatedFiche n° 27 side 1/2
IMMOBILISER CIRCUIT
XR25 aid:*22 = 1 dEF CO, CC- or CC+ line 30 on the computer
*22 = 2 dEF Refer to the immobiliser fault finding
2
Ignore this bargraph if the vehicle is not fitted with an immobiliser.NOTES
Connect the bornier in place of the computer and check the insulation, continuity and that there is no
interference resistance on the wiring on track 30 of the computer.
Repair if necessary.
If the fault persists, refer to the immobiliser fault finding.
17-85
Page 131 of 363

Connect the bornier in place of the computer and check the insulation and continuity of the line:
Computer 2 2 Air temperature sensor
Computer 15 1 Air temperature sensor
Repair if necessary.
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 3 LH side illuminatedFiche n° 27 side 1/2
AIR TEMPERATURE SENSOR CIRCUIT
XR25 aid:CO, CC- or CC+line 2 or 15
3
For certain faults BG 6RH may be flashing
If BG 4LH or BG 5LH or BG 6LH or BG 6RH are also illuminated,check line 15 on the
computer.
NOTES
Check the resistance of the sensor. Replace it if necessary.
The fault persists! Replace the injection computer.
IMPORTANT: The computer has probably been damaged by an electric shock. The cause of the damage
must be found before fitting a new computer.
17-86
Page 132 of 363

Connect the bornier in place of the computer and check the insulation and continuity of the line:
Computer 22 C Oxygen sensor
Repair if necessary.
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Turn the engine, switch the ignition on and erase the computer memory using
G0**. Try to start the engine. Switch the ignition on, then deal with the other
faults. Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 3 RH side illuminated or flashingFiche n° 27 side 1/2
OXYGEN SENSOR CIRCUIT
XR25 aid:CO, CC- or CC+line 22
CO line 4
3
If BG 3RH is flashing, increase the engine speed to 2500 rpm for 5 minutes
If BG 3RH becomes permanently illuminated, deal with the fault.
NOTES
Check the connection and the condition of the connector on the oxygen sensor.
Check, ignition on during the timed phase, for :
-earth on track B of the oxygen sensor,
-+ 12 V after the fuel pump relay on track A of the oxygen sensor.
Repair if necessary.
Check for the presence of earth on track 4 on the injection computer.
Repair if necessary.
The fault persists. Replace the oxygen sensor.
The fault persists! Replace the injection computer.
IMPORTANT: The computer has probably been damaged by an electric shock. The cause of the damage
must be found before fitting a new computer.
17-87
Page 133 of 363

Connect the bornier in place of the computer and check the insulation and continuity of the line:
Computer 15 1 Coolant temperature sensor
Computer 6 2 Coolant temperature sensor
Repair if necessary.
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 4 LH side illuminatedFiche n° 27 side 1/2
COOLANT TEMPERATURE SENSOR CIRCUIT
XR25 aid:CO, CC- or CC+line 15 or 6
4
If BG 3LH or BG 5LH or BG 6LH or BG 6RH is also illuminated, check line 15 on the
computer. For certain faults, BG 4LH is only permanently illuminated when the
engine is running.
NOTES
The fault persists! Replace the injection computer.
IMPORTANT: The computer has probably been damaged by an electric shock. The cause of the damage
must be found before fitting a new computer.
Check the resistance of the sensor. Replace it if necessary.
17-88
Page 134 of 363

Connect the bornier in place of the computer and check the insulation, continuity and that there is no
interference resistance on the line:
Computer 8 B1 Vehicle speed sensor
Repair if necessary.
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 4 RH side illuminated or flashingFiche n° 27 side 1/2
VEHICLE SPEED CIRCUIT
XR25 aid:CO, CC- or CC+ line 8
4
Carry out a road test if BG 4RH is flashingNOTES
Check the sensor is correctly positioned.
Check on the vehicle speed sensor for:
-earth on track B2,
-+ 12 after ignition feed on track A.
Repair if necessary.
The fault persists! Replace the sensor.
The fault persists! Replace the injection computer.
IMPORTANT: The computer has probably been damaged by an electric shock. The cause of the damage
must be found before fitting a new computer.
17-89
Page 135 of 363

Connect the bornier in place of the computer and check the insulation, continuity and that there is no
interference resistance on the line:
Computer 5 C Pressure sensor
Computer 15 A Pressure sensor
Computer 23 B Pressure sensor
Repair if necessary.
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 5 LH side illuminatedFiche n° 27 side 1/2
PRESSURE SENSOR CIRCUIT
XR25 aid:CO, CC- or CC+ line 5, 15 or 23
5
If BG 6RH is also illuminated, check line 5 on the computer.
If BG 4LH or BG 3LH or BG 6LH or BG 6RH is also illuminated, check line 15 on the
computer.
NOTES
Check that the pressure sensor is connected correctly both electrically and pneumatically.
Check the conformity of the pressure sensor pipe (it must not be holed or blocked...).
The fault persists! Replace the injection computer.
IMPORTANT: The computer has probably been damaged by an electric shock. The cause of the damage
must be found before fitting a new computer.
The fault persists! Replace the sensor.
17-90
Page 136 of 363

Connect the bornier in place of the computer and check the insulation,
continuity and that there is no interference resistance on the line:
Computer 13 B Target sensor
Computer 31 A Target sensor
Repair if necessary.
JSA051.0
INJECTION
Fault finding - Interpretation of XR25 bargraphs17
D7F 710
engine -
35 tracks
Erase the computer memory using G0**.
Try to start the engine. Switch the ignition on, then deal with the other faults.
Remember to carry out a status and parameter check.AFTER REPAIR
Bargraph 5 RH side illuminated or flashingFiche n° 27 side 1/2
FLYWHEEL SIGNAL CIRCUIT
XR25 aid:*25 = CO.0 =>CO or CC- line 13 or 31
*25 = CC.0 =
>CC- line 13 or 31 on the computer
*25 = In =
>sensor incorrectly connected
5
Try to illuminate BG 5RH when the starter is activated.
BG 5RH often seen to flash if *25 = dEF as its permanent illumination is very quick.
In certain cases, BG 5RH may illuminate then extinguish.
NOTES
Check the resistance of the target sensor.
Replace the sensor if necessary.*25 = CO.0
*25 = CC.0
Check the condition of the flywheel, especially if it has been removed.
The fault persists! Replace the injection computer.
IMPORTANT: The computer has probably been damaged by an electric shock.
The cause of the damage must be found before fitting a new
computer.
Check the target sensor has been correctly connected (the sensor connector must
not be inverted).
Repair if necessary.*25 = In
The fault persists! Replace the sensor.
17-91