| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| 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 | Move on to Step 1 | Fault in the air intake circuit | Renew the air intake circuit |
| Obstruction in the catalytic converter | Replace the catalytic converter Op. 1080B62 CATALYTIC CONVERTER - R + R |
| Water in the fuel | Remove water from the fuel |
| Leaks in fuel circuit | Eliminate leaks |
| Fuel filter blocked | Replace the fuel filter |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check:- that there are no errors in the control unit;- parameter plausibility. | Move on to Step 2 | Error detected in the control unit | Continue following the instructions on the diagnostic equipment |
| Implausible parameters | Continue following the instructions on the diagnostic equipment |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|
| Carry out a road test, keeping the diagnostic equipment connected. | Make sure that the conditions in which the problem occurs are reproduced |
Check:- that there are no errors in the control unit;- parameter plausibility. | End of diagnosis | The sudden onset of errors in the control unit is detected | Continue following the instructions on the diagnostic equipment |
| Parameters off the scale. | Move on to Step 3 |
| 3 | ACCELERATOR PEDAL CHECK | All OK | Problems encountered | Operation |
|---|
| Using the Examiner, check that the signal reaches 100% when reading the parameters and that it goes to the end of travel position | Move on 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 |
| 4 | MOTORIZED THROTTLE OPERATION CHECK | All OK | Problems encountered | Operation |
|---|
| Check the condition of the motorized throttle actuator connectionCheck the condition of the wiringCheck that the motorized throttle is working properly, carrying out See Test 1056BW Check on the throttle body actuator operation | Move on to Step 5 | Connection defective | Restore correct connection. |
| Wiring defective | Restore the correct wiring. |
| Motorized throttle defective | Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R |
| 5 | IGNITION SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| Inspect the spark plugs, checking:- for possible electrode wear;- for carbon deposits;- for any damage to the spark plug insulator;- that the distance between the electrodes is correct;- the correct HV signal, by carrying out the See Test 5510CI IGNITION COIL OPERATION CHECK See Test 5510CE IGNITION CONTROL SIGNAL CHECK See Test 5510OB IGNITION COIL RESISTANCE CHECK | Move on 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. |
| 6 | INJECTOR CHECK | All OK | Problems encountered | Operation |
|---|
| Using the Examiner, check in active diagnosis that all the injectors are working properly.Identify any injector that may be mechanically stuck shut. | Move on to Step 7 | Injector defective | Replace the injector Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT |
| 7 | ELECTRIC PUMP CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the electric pump is receiving the correct power supply by carrying out the following: See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKE | Move on 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 |
| 8 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
|---|
| 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 |
