| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| 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 fuelFuel 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 Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| 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 |
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| 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 |
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| Using the Examiner, check that the signal reaches 100% when reading the parameters and 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 |
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| Check the condition of the motorized throttle actuator connectionCheck the condition of the wiringCheck that the motorized throttle is working properly by doing the following: 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 |
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| 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 doing the following: See Test 5510CI IGNITION COIL OPERATION 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 |
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| 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 |
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| Check that the electric pump is receiving the correct power supply | 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 |
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| Check that the fault is no longer present | End of diagnosis | The problem persists | Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |