Page 25 of 363

DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIRErase the computer memory (G0**), switch the ignition off, then carry out a road
test.
Finish the operation by checking using the XR25.
Bargraph 9 RH illuminated (co.0) or flashing (cc.1)
PAS pump assembly relay control circuit
XR25 aid:*29 :co.0 : Open circuit or short circuit to earth
cc.1 : Short circuit to 12 volts
9
Use bornier Elé. 1332 for any operations on the computer connector.NOTES
co.0
Measure the resistance of the PAS pump assembly relay coil (position C on the engine connection unit).
Replace the relay if its resistance is not approximately 65 ohms.
Ensure the continuity and insulation from earth of the connection between track 20 on the computer
connector and terminal 2 on the pump assembly relay mounting.
Ensure the presence of + after ignition feed at terminal 1 of the pump assembly relay mounting.
Check the connections on the computer connector and the relay mounting.
None NOTES
If the fault persists after these tests, replace the PAS pump assembly relay.
If the "PAS pump assembly relay control circuit" fault reappears, replace the injection computer (consult
the "Aid" section for this operation).
cc.1
Measure the resistance of the PAS pump assembly relay coil (position C on the engine connection unit).
Replace the relay if its resistance is not approximately 65 ohms.
Ensure the insulation from + 12 Volts of the connection between track 20 of the computer connector
and terminal 2 on the pump assembly relay mounting.
Even if present at the moment of testing, this fault is still declared
by a flashing BG 9RH side. To confirm its presence and the necessity
of following the fault finding below, erase the computer memory
then start command mode G36*.
The fault is present if the bargraph flashes again.
NOTES
If the fault persists after these tests, replace the PAS pump assembly relay.
If the "PAS pump assembly relay control circuit" fault reappears, replace the injection computer (consult
the "Aid" section for this operation).
Fiche n° 60 1/2
13-21
Page 26 of 363
DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIRErase the computer memory (G0**), switch the ignition off, then carry out a road
test.
Finish the operation by checking using the XR25.
Bargraph 10 LH flashing
Fault warning light circuit
XR25 aid:*10 : cc.1 : Short circuit to 12 volts
10
Even if present at the moment of testing, this fault is still declared by a flashing
BG 10LH side. To confirm its presence and the necessity of following the fault fin-
ding below, erase the computer memory then start command mode G21*1*.
The fault is present if the bargraph flashes again.
Use bornier Elé. 1332 for any operations on the computer connector.
NOTES
Fiche n° 60 1/2
cc.1
Ensure insulation in relation to 12 volts of the connection between track 18 of the computer connector
and the instrument panel warning light (track 6 on connector MA).
Test at the warning light bulb (bulb in short circuit).
None NOTES
13-22
Page 27 of 363

DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIRErase the computer memory (G0**), switch the ignition off, then carry out a road
test.
Finish the operation by checking using the XR25.
Bargraph 10 RH illuminated (Co.0) or flashing (cc.1)
Preheating warning light circuit
XR25 aid:*30 :cc.0 : Open circuit or short circuit to earth
cc.1 : Short circuit to 12 volts
10Fiche n° 60 1/2
co.0
Check the condition of the preheating warning light bulb then the presence of +after ignition feed at
the warning light.
Ensure the continuity and insulation in relation to earth of the connection between track 9 of the
computer connector and the instrument panel preheating warning light (track 5 on CY connector).
Test the connections on the computer connector.
None NOTES
cc.1
Ensure insulation in relation to 12 volts of the connection between track 9 of the computer connector
and the instrument panel preheating warning light (track 5 on connector CY).
Test at the preheating warning light bulb (bulb in short circuit).
Use bornier Elé. 1332 for any operations on the computer connector.NOTES
Even if present at the moment of testing, this fault is still declared
by a flashing BG 10RH side. To confirm its presence and the necessity
of following the fault finding below, erase the computer memory
then start command mode G21*2*.
The fault is present if the bargraph flashes again.
NOTES
13-23
Page 28 of 363
DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIRErase the computer memory (G0**), switch the ignition off, then carry out a road
test.
Finish the operation by checking using the XR25.
Bargraph 12 LH illuminated
Battery voltage
XR25 aid:*12 :1.dEF : Battery voltage low
2.dEF : Battery voltage too high
12
Carry out a complete check of the charging circuit using the Optima 5800 dia-
gnostic station.NOTES
Carry out the operations required to ensure correct voltage feed to the computer:
8 volts < correct voltage< 16 volts.
- Check the battery charge.
- Check the charging circuit.
- Check the tightness and condition of the battery terminals.
- Check the computer earth.
Ensure the presence of + after ignition feed on track 1 of the computer connector.
Fiche n° 60 1/2
13-24
Page 29 of 363
DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIRErase the computer memory (G0**), switch the ignition off, then carry out a road
test.
Finish the operation by checking using the XR25.
Bargraph 12 RH illuminated
Full load or no load not programmed12
None NOTES
Programme the full load position of the accelerator pedal using command G31* (do not adjust the load
lever directly).
Enter code G31* on the XR25 (engine speed zero).
- Press the accelerator pedal when the display flashes "PF".
The display then shows "bon", "Fin" then "6/7.dIE" when the procedure has been completed correct-
ly. Bargraph 12 RH side must be extinguished.
- Switch off the ignition.
Fiche n° 60 1/2
13-25
Page 30 of 363

DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIRErase the computer memory (G0**), switch the ignition off, then carry out a road
test.
Finish the operation by checking using the XR25.
Bargraph 13 LH flashing (cc.1)
Air conditioning cut out information circuit
XR25 aid:*13 :cc.1 : Short circuit to 12 volts
13
None NOTES
Fiche n° 60 1/2
cc.1
Ensure insulation in relation to 12 volts of the connection between track 19 on the computer connector
and track 18 on the air conditioning computer connector.
Test the connections on the 2 connectors (+ intermediate connection engine / dashboard).
Even if present at the moment of testing, this fault is still declared
by a flashing BG 13LH side. To confirm its presence and the necessity
of following the fault finding below, erase the computer memory
then start the engine. The fault is present if the bargraph flashes
when the engine is running.
NOTES
If the fault persists after these tests, replace the air conditioning control module.
If the "air conditioning cut out information "fault reappears, replace the diesel injection computer (consult
the "Aid" section for this operation).
13-26
Page 31 of 363
DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIR
Bargraphs 2 RH and LH sides and bargraph 3 RH side
Solenoid valve control2
None NOTES
These bargraphs visualise the control of the various solenoid valves:
- Advance solenoid valve (bargraph 2 LH side is always illuminated).
- Fast idle solenoid valve .
- EGR solenoid valve.
Fiche n° 60 2/2
3
Ensure the bargraphs operate correctly
Bargraph 4 LH side
Erase stored faults
XR25 aid :BG 4LH is illuminated if command mode G0** to erase the memory
has been used since the last XR25 dialogue began.
4Fiche n° 60 2/2
None
NOTES
Bargraph 4 RH side
Preheating prevented
XR25 aid :BG 4RH is illuminated if command mode G59*1* to prevent control
of the heater plugs has been used since the last XR25 dialogue be-
gan.
4Fiche n° 60 2/2
None
NOTES
13-27
Page 32 of 363

Bargraphs 9 RH and 9 LH side
Air conditioning
XR25 aid :BG 9LH illuminated if AC requested
BG 9RH illuminated if AC authorised
DPCF01 1.0
LUCAS DIESEL INJECTION
Fault finding - Interpretation of XR25 bargraphs13
AFTER REPAIR
Bargraphs 5 and 6 RH and LH sides
Relay control5
None NOTES
These bargraphs visualise the control of the various relays:
- Preheating relay N° 1.
- Preheating relay N° 2 (not used).
- Power assisted steering pump assembly relay (for AC + PAS).
- Altimetric corrector relay.
Fiche n° 60 2/2
6
Ensure the bargraphs operate correctly
9Fiche n° 60 2/2
If
BG 9LH is extinguished when AC is requested, ensure the continuity and insula-
tion of the connection between track 11 of the diesel computer connector and
track 20 of the AC computer connector.
NOTES
Bargraph 10 LH side
Warning light control
XR25 aid :BG 10LH is illuminated if the warning light on the instrument panel
is controlled. This bargraph is normally illuminated; it extinguishes
when the engine is running if there is no fault.
10Fiche n° 60 2/2
None
NOTES
13-28