ABOVE THRESHOLD
Test results
1
ELECTRICAL CONNECTIONS CHECK
All OK
Problems encountered
Operation
Check for loose electrical connections at the throttle body connector 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 continuity of the earth connections.
Go to Step 5
Earths not correctly tightened, oxidised, painted.
Restore the correct earth connections.
5
WATER TEMPERATURE SENSOR 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
AIR TEMPERATURE SENSOR 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 7
Air temperature sensor not working properly
Replace the air temperature sensor
Op. 1056B54 INTAKE AIR PRESSURE/TEMPERATURE SENSOR - R.R.
7
ACCELERATOR PEDAL OPERATION CHECK
Check that the accelerator pedal potentiometers are working properly using the diagnostic equipment.
Go to Step 8
Accelerator pedal potentiometers not working properly
Replace the accelerator pedal
Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
8
RPM SENSOR CHECK
Check that the rpm sensor is working properly by carrying out the
See Test 5510CD RPM SENSOR COIL OPERATION CHECK
and the
See Test 5510CF RPM SIGNAL CHECK
Go to Step 9
Rpm sensor not working properly (engine rpm reading = 0 rpm)
Replace the rpm sensor
Op. 5510C26 ENGINE RPM SENSOR - R+R
9
THROTTLE BODY OPERATION CHECK
Check that the throttle body is working properly by carrying out the
See Test 1056BW Check on the throttle body actuator operation
Go to Step 10
Throttle body not working properly.
Replace the throttle body
Op. 1056B14 THROTTLE BODY - R + R
10
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
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