| 1 | FUEL SUPPLY CIRCUIT CHECKS | All OK | Problems encountered | Operation |
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| Check that the air intake/vacuum circuit is working properlyCheck the condition of the fuel supply circuit and make sure that it is working properly.Also check:- wiring on engine correctly fastened to earth;- battery correctly fastened to earth;- positive battery terminal and all leads connected to it correctly fastened | Move on to Step 2 | Supply fastenings slack or oxidized | Restore correct fastenings See E1010 POWER SUPPLY |
| Earth fastenings slack or oxidized | Restore correct fastenings See E1010 POWER SUPPLY |
| 2 | CHECKS USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| With the Examiner connected to the engine control unit, check for the presence of any errors | Move on to Step 3 | Presence of errors | Continue as instructed by the diagnostic equipment |
| 3 | MOTORIZED THROTTLE CHECK | All OK | Problems encountered | Operation |
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| - Check that the motorized throttle is working properly See Test 1056BW Check on the throttle body actuator operation- Check the continuity of the wiring between the engine control unit and the motorized throttle | End of diagnosis | Motorized throttle defective | Replace the motorized throttle Op. 1056B14 THROTTLE CASE - R + R |