Test results
1
COMPONENT CONCERNED
ELECTRICAL CONNECTIONS CHECK
OK (NO FAULTS DETECTED)
FAULT DETECTED
OPERATION
Connections on fuel pump relay and engine management control unit
Check for loose connections at the relay and at the engine management control unit.
Go to Step 2
Presence of loose electrical connections.
Restore the correct connections.
2
FUEL PUMP RELAY WIRING CHECK
Fuel pump relay wiring
Check for the presence of a short circuit to earth in the wiring from fuel pump relay to engine management control unit
Go to Step 3
Presence of short circuit to earth
Restore correct insulation to earth
3
Check for the presence of a short circuit to Vbatt in the wiring from fuel pump relay to engine management control unit
Go to Step 4
Presence of short circuit to Vbatt.
Restore correct insulation to +battery
4
Check for the presence of an open circuit in the wiring from fuel pump relay to engine management control unit
End of diagnosis
Presence of open circuit in the wiring
Restore the correct continuity