Test results

Check the following, in order:

- no leaks in fuel circuit;

- condition of the air intake circuit;

- no obstructions in the catalytic converter;

- no water or impurities in the petrol - fuel filter very blocked

Go to Step 1

Fault in the air intake circuit

Restore the air intake circuit to correct operation

Obstruction in the catalytic converter

Replace the catalytic converter

 Op. 1080B62 CATALYTIC CONVERTER - R + R

Water in the petrol

Remove the water from the petrol

Leaks in fuel circuit

Eliminate leaks

Fuel filter blocked

Replace the fuel filter

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.

Check:

- that there are no errors in the control unit;

- parameter plausibility.

Go to Step 2

Error detected in the control unit

Continue following the instructions on the diagnostic equipment

Parameters not plausible

Continue following the instructions on the diagnostic equipment

Carry out a road test, keeping the diagnosis equipment connected.

Reproduce the conditions in which the problem occurs

Check:

- that there are no errors in the control unit;

- parameter plausibility.

End of diagnosis

Sudden onset of errors in the control unit detected

Continue following the instructions on the diagnostic equipment

Parameters off the scale.

Go to Step 3

Using the Examiner, check that the signal reaches 100% when reading the parameters and goes to the end of travel position

Go to Step 4

Accelerator pedal travel incorrect

Restore the accelerator pedal travel

Accelerator pedal potentiometer defective

Replace the accelerator pedal

 Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R

Check the condition of the motorized throttle actuator connection

Check the condition of the wiring

Check that the motorized throttle is working properly, carrying out

 See Test 1056BW Check on the throttle body actuator operation

Go to Step 5

Connection defective

Restore correct connection.

Wiring defective

Restore the correct wiring.

Motorized throttle defective

Replace the motorized throttle

 Op. 1056B14 THROTTLE BODY - R + R

Inspect the spark plugs, checking:

- for possible electrode wear;

- for carbon deposits;

- for any damage to the spark plug insulation;

- that the distance between the electrodes is correct;

- for the correct HT signal, by carrying out the

 See Test 5510CI CHECK ON OPERATION OF IGNITION COILS

 See Test 5510CE IGNITION CONTROL SIGNAL CHECK

 See Test 5510OB IGNITION COIL RESISTANCE CHECK

Go to Step 6

Spark plugs defective

Replace spark plugs

 Op. 5510D10 SPARK PLUGS - R+R

Coils defective

Replace coils

 Op. 5510C14 IGNITION COIL/S - R.R.

Using the Examiner, check in active diagnosis that all the injectors are working properly.

Identify any injector that may be mechanically stuck shut.

Go to Step 7

Injector defective

Replace the injector

 Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT

Check that the pump is receiving a correct power supply by carrying out the

 See Test 1040AA CHECK ON POWER SUPPLY VOLTAGE AND CURRENT UPTAKE

Go to Step 8

Connection to electric pump earth defective

Restore the correct earth connection.

Electric pump defective

Replace the electric pump

 Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R

Check that the fault is no longer present

End of diagnosis

The fault persists

Replace the engine management control unit

 Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R