Test results
1
COMPONENT CONCERNED
ELECTRICAL CONNECTIONS CHECK
OK (NO FAULTS DETECTED)
FAULT DETECTED
OPERATION
Connections on engine rpm sensor and engine management control unit
Check for loose electrical connections at the sensor and at the engine management control unit.
Go to Step 2
Presence of loose electrical connections.
Restore the correct connections.
2
WIRING CONTINUITY CHECK
Engine rpm sensor wiring
Check for breaks in the wiring continuity caused by oxidised or corroded terminals
Go to Step 3
Breaks in the wiring continuity.
Restore the correct continuity for the wiring.
3
WIRING INSULATION CHECK
Check the condition of the wiring insulation
Go to Step 4
Wiring insulation faulty.
Restore correct wiring insulation.
4
RPM SENSOR OPERATION CHECK
Engine rpm sensor
Check that the rpm sensor is working properly
See Test 5510CD RPM SENSOR COIL OPERATION CHECK
See Test 5510CF RPM SIGNAL CHECK
End of diagnosis
Rpm sensor not working correctly.
Replace the rpm sensor
Op. 5510C26 ENGINE RPM SENSOR - R+R