ABOVE THRESHOLD (short circuit to GND)
Test results
1
ELECTRICAL CONNECTIONS CHECK
All OK
Problems encountered
Operation
Check for loose electrical connections at the air 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
AIR TEMPERATURE SENSOR OPERATION CHECK
Check that the air temperature sensor is working properly by carrying out the
See Test 1056BU CHECK ON OPERATION OF PRESSURE SENSOR AND/OR INTAKE AIR TEMPERATURE SENSOR
Go to Step 6
Air temperature sensor not working properly.
Replace the air temperature sensor
Op. 1056B54 INTAKE AIR PRESSURE/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
BELOW THRESHOLD (short circuit to Vbatt, open circuit)