| 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 faults in the engine management control unit;- the plausibility of all the parameters. | Move on to Step 2 | 1. No communication with the control unit.2. Control unit faulty. | 1. Restore:a) connection between the engine management control unit and the diagnostic connector;b) engine management control unit power supply See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Continue following the instructions on the diagnostic equipment. |
| 2 | CORRECT OPERATION CHECK ON RELEVANT WARNING LIGHT | All OK | Problems encountered | Operation |
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| Carry out active diagnosis on the spark plug warning light using the diagnostic equipment in instrument panel mode. | Move on to Step 3 | The warning light does not flash. | Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R |
| 3 | SPARK PLUG CONTROL UNIT WIRING CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the wiring between the spark plug control unit and the engine control unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Check that the spark plug control unit power supply is correct See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | End of diagnosis. | 1. Wiring defective.2. Power supply not correct. | 1. Restore the correct wiring.2. Restore correct power supply. |
