| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| Check the following, in order:- engine control unit correctly fastened to earth;- correct fastening to earth of the battery; - correct fastening of the positive battery pole and all the cables fastened to it- correct connection of the engine control unit connector | Move on to Step 1 | Battery fastenings slack or oxidized | Restore correct fastenings |
| Control unit earth cable fastening loose | Tighten earth cable |
| Incorrectly connected engine control unit connector | Correctly engage engine control unit connector |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and 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 |
| Impossible to activate a dialogue with the control unit | Move on to Step 2 |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|
| Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected and check:- that there are no errors in the control unit;- parameter plausibility | Move on to Step 3 | The sudden onset of errors in the control unit is detected | Continue following the instructions on the diagnostic equipment |
| Parameters off the scale. | Continue following the instructions on the diagnostic equipment |
| Loss of dialogue between the control unit and the diagnostic equipment. | Restore the correct connections. |
| 3 | IGNITION SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| Check the continuity of the supply wiring for the coilsCheck that the ignition coils are working, by carrying out See Test 5510CI IGNITION COIL OPERATION CHECK See Test 5510CE IGNITION CONTROL SIGNAL CHECK | Move on to Step 4 | Power supply wiring to coils defective | Restore correct wiring |
| Coils defective | Replace coils Op. 5510C14 IGNITION COIL/S - R.R. |
| 4 | INJECTION SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| - Check the continuity of the power supply wiring See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 5 | Power supply wiring to injectors defective | Restore correct wiring. |
| 5 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the engine control unit is working properly. | End of diagnosis | Engine management control unit defective. | Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |
