SIGNAL NOT VALID
Test results
1
ELECTRICAL CONNECTIONS CHECK
All OK
Problems encountered
Operation
Check for loose electrical connections at the water temperature 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
Check for breaks in the wiring continuity
See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
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
EARTH CONNECTIONS CHECK
Check the condition of the earth connections.
Go to Step 5
Restore the correct earth connections.
5
WATER TEMPERATURE SENSOR OPERATION CHECK
Check that the water temperature sensor is working properly by carrying out the
See Test 1056BC Engine coolant temperature sensor operation check
Go to Step 6
Water temperature sensor not working properly
Replace the water temperature sensor
Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
6
ENGINE MANAGEMENT CONTROL UNIT OPERATION CHECK
Check that the engine management control unit is working properly.
End of diagnosis
Engine management control unit faulty.
Replace the engine management control unit
Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
ABOVE THRESHOLD (short circuit to GND)
BELOW THRESHOLD (short circuit to Vbatt, short circuit to +5V)