1.DEF : Relay cut off too soon 2.DEF : Relay cut off too late
NOTES
Conditions for applying the fault finding procedure:
The fault reappears after:
– the fault memory has been cleared, – starting the engine,
– the ignition is switched off with loss of communication, – switching on the ignition,
– establishing communication.
Special notes:
Use bornier Elé. 1681 for all operations on the engine management computer connectors.
Refer to the Wiring diagrams Technical Note for the vehicle to locate the relevant fuses and relays.
1.DEF NOTES None.
Check the connections of the injection supply relay mounting.
Check the engine management computer connections.
Repair if necessary.
Check the tightness and condition of the + and - battery terminals.
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
EDC15C3_V08_DF098M
CONTINUED 1
For F9Q 732 and 740 engines:
Check the continuity of the following connections:
Injection supply relay track B5 Tracks M2 and M3, connector B of the engine management computer
Injection supply relay track B2 Track D4, connector B of the engine management computer
For F9Q 718 and G9T 720 engines:
Check the continuity of the following connections:
Injection supply relay mounting track 5 Tracks M2 and M3, connector B of the engine management computer
Injection supply relay track 2 Track D4, connector B of the engine management computer
For the G9T 710 engine:
Check the continuity of the following connections:
Injection supply relay track A5 Tracks M2 and M3, connector B of the engine
DF098 CONTINUED 2
2.DEF NOTES None.
Check the main relay connections.
Check the engine management computer connections.
Repair if necessary.
Check the conformity of the main relay (relay removed):
– Insulation of contacts between tracks 3 and 5 or A3 and A5 or B3 and B5 (depending on the engine).
– Coil resistance between tracks 1 and 2 or A1 and A2 or B1 and B2 (depending on the engine).
Replace the relay if its resistance is not: 60 ΩΩΩΩ ±±±± 5 at + 20°°°°C.
For F9Q 732 and 740 engines:
Check the insulation against earth on the following connection:
Injection supply relay track B2 Track D4, connector B of the engine management computer
For F9Q 718 and G9T 720 engines:
Check the insulation against earth on the following connection:
Injection supply relay track 2 Track D4, connector B of the engine management computer
For the G9T 710 engine:
Check the insulation against earth on the following connection:
Injection supply relay track A2 Track D4, connector B of the engine management computer
If the fault is still present, replace the injection feed relay.
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
OR STORED
1.DEF: over-current L 2.DEF: over-current H 3.DEF: error during clearing
NOTES
Conditions for applying the fault finding procedure to stored faults:
If the fault becomes present following an engine start.
Special notes:
Use bornier Elé. 1681 for all operations on the engine management computer connectors.
WARNING
– Please observe the cleanliness guidelines and safety advice.
CO NOTES None.
Check the connections on injector n° 1.
Check the engine management computer connections.
Repair if necessary.
DF099 CONTINUED
1.DEF
2.DEF NOTES
Priorities in dealing with a number of faults:
Deal with fault DF089 Injector control capacitor voltage first if it is present.
Check the connections on injector n° 1.
Check the engine management computer connections.
Repair if necessary.
Measure the resistance of injector n° 1.
Replace the injector if there is a short circuit (R = 0 ΩΩΩΩ).
Check the insulation between the following two connections:
Engine management computer, connector C track M1
track 2 of the injector n° 1 connector
Engine management computer, connector C track M3
track 1 of the injector n° 1 connector
Check the insulation against earth and + 12 V of the following connections:
Engine management computer, connector C track M1
track 2 of the injector n° 1 connector
Engine management computer, connector C track M3
track 1 of the injector n° 1 connector
If the fault is still present: run Test 10 Poor injector operation.
3.DEF NOTES None.
If the fault is stored, clear the fault from the engine management computer memory.
Switch off the ignition, then switch it on again to initialise the computer.
If the fault is present, contact the Techline.
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
OR STORED
1.DEF: over-current L 2.DEF: over-current H 3.DEF: error during clearing
NOTES
Conditions for applying the fault finding procedure to stored faults:
If the fault becomes present following an engine start.
Special notes:
Use bornier Elé. 1681 for all operations on the engine management computer connectors.
WARNING
– Please observe the cleanliness guidelines and safety advice.
CO NOTES None.
Check the connections on injector n° 2.
Check the engine management computer connections.
Repair if necessary.
DF100 CONTINUED
1.DEF
2.DEF NOTES
Priorities in dealing with a number of faults:
Deal with fault DF089 Injector control capacitor voltage first if it is present.
Check the connections on injector n° 2.
Check the engine management computer connections.
Repair if necessary.
Measure the resistance of injector n° 2.
Replace the injector if there is a short circuit (R = 0 ΩΩΩΩ).
Check the insulation between the following two connections:
Engine management computer, connector C track L4
track 2 of the injector n° 2 connector
Engine management computer, connector C track L3
track 1 of the injector n° 2 connector
Check the insulation against earth and + 12 V of the following connections:
Engine management computer, connector C track L4
track 2 of the injector n° 2 connector
Engine management computer, connector C track L3
track 1 of the injector n° 2 connector
If the fault is still present: run Test 10 Poor injector operation.
3.DEF NOTES None.
If the fault is stored, clear the fault from the engine management computer memory.
Switch off the ignition, then switch it on again to initialise the computer.
If the fault is present, contact the Techline.
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
OR STORED
1.DEF: over-current L 2.DEF: over-current H 3.DEF: error during clearing
NOTES
Conditions for applying the fault finding procedure to stored faults:
If the fault becomes present following an engine start.
Special notes:
Use bornier Elé. 1681 for all operations on the engine management computer connectors.
WARNING
– Please observe the cleanliness guidelines and safety advice.
CO NOTES None.
Check the connections of injector n° 3.
Check the engine management computer connections.
Repair if necessary.
DF101 CONTINUED
1.DEF
2.DEF NOTES
Priorities in dealing with a number of faults:
Deal with fault DF089 Injector control capacitor voltage first if it is present.
Check the connections of injector n° 3.
Check the engine management computer connections.
Repair if necessary.
Measure the resistance of injector n° 3.
Replace the injector if there is a short circuit (R = 0 ΩΩΩΩ).
Check the insulation between the following two connections:
Engine management computer, connector C track M2
track 2 of the injector n° 3 connector
Engine management computer, connector C track L2
track 1 of the injector n° 3 connector
Check the insulation against earth and + 12 V of the following connections:
Engine management computer, connector C track M2
track 2 of the injector n° 3 connector
Engine management computer, connector C track L2
track 1 of the injector n° 3 connector
If the fault is still present: run Test 10 Poor injector operation.
3.DEF NOTES None.
If the fault is stored, clear the fault from the engine management computer memory.
Switch off the ignition, then switch it on again to initialise the computer.
If the fault is present, contact the Techline.
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
OR STORED
1.DEF: over-current L 2.DEF: over-current H 3.DEF: error during clearing
NOTES
Conditions for applying the fault finding procedure to stored faults:
If the fault becomes present following an engine start.
Special notes:
Use bornier Elé. 1681 for all operations on the engine management computer connectors.
WARNING
– Please observe the cleanliness guidelines and safety advice.
CO NOTES None.
Check the connections on injector n° 4.
Check the engine management computer connections.
Repair if necessary.
DF102 CONTINUED
1.DEF
2.DEF NOTES
Priorities in dealing with a number of faults:
Deal with fault DF089 Injector control capacitor voltage first if it is present.
Check the connections on injector n° 4.
Check the engine management computer connections.
Repair if necessary.
Measure the resistance of injector n° 4.
Replace the injector if there is a short circuit (R = 0 ΩΩΩΩ).
Check the insulation between the following two connections:
Engine management computer, connector C track L1
track 2 of the injector n° 4 connector
Engine management computer, connector C track M4
track 1 of the injector n° 4 connector
Check the insulation against earth and + 12 V of the following connections:
Engine management computer, connector C track L1
track 2 of the injector n° 4 connector
Engine management computer, connector C track M4
track 1 of the injector n° 4 connector
If the fault is still present: run Test 10 Poor injector operation.
3.DEF NOTES None.
If the fault is stored, clear the fault from the engine management computer memory.
Switch off the ignition, then switch it on again to initialise the computer.
If the fault is present, contact the Techline.
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
OR STORED
CO.0 : Open circuit or short circuit to earth CC.0 : Short circuit to earth
CO : Open circuit
NOTES
Conditions for applying the fault finding procedure to stored faults:
If the fault reappears as present after:
– an actuator command AC302 Thermoplunger n°°°° 2 relay,
– the engine has been started, after the engine has been running at idle speed for 30 seconds, with windscreen de-icer not selected and the engine temperature at starting less than 70°C.
Special notes:
Use bornier Elé. 1681 for all operations on the engine management computer connectors.
The thermoplunger n° 2 relay supplies two thermoplungers in parallel.
Refer to the Wiring diagrams Technical Note for the vehicle to locate the relevant fuses and relays.
CC.1 NOTES None.
DF104 CONTINUED 1
For G9T 710 and 720 engines:
Check the insulation against + 12 V on the connection between:
Engine management computer, connector B track F3
track 2 thermoplunger n° 2 relay mounting
Also check that this connection is insulated against the following connections:
Thermoplunger n° 2 relay mounting, track 1 + 12 V after relay
Thermoplunger n° 2 relay mounting, track 3 + 12 V battery after fuse feed For G9T 720 engines (specific to 16-seat Master bus):
Check the insulation against + 12 V on the connection between:
Engine management computer, connector B track F3
track 6 thermoplunger n° 2 relay mounting
Also check that this connection is insulated against the following connections:
Thermoplunger n° 2 relay mounting, track 10 + 12 V after relay
Thermoplunger n° 2 relay mounting, track 9 + 12 V battery after fuse feed
AFTER REPAIR
Deal with any other possible faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic tool.
CONTINUED 2
CO.0 CC.0 CO
NOTES None.
Check the thermoplunger n° 2 relay connections.
Check the engine management computer connections.
Repair if necessary.
Measure the resistance of the thermoplunger n° 2 relay coil between tracks 1 and 2 or 6 and 10.
Replace the relay if its resistance is not: 60 ΩΩΩΩ ±±±± 5 at + 20°°°°C.
For G9T 710 and 720 engines:
Check the continuity and insulation against earth of the connection between:
Engine management computer, connector B track F3
track 2 thermoplunger n° 2 relay mounting
For G9T 720 engine (specific to 16-seat Master):
Check the continuity and insulation against earth of the connection between:
DF105 PRESENT
OR STORED