Test results

If the error type is MUTE, check:

- CAN line continuity

- Engine management control unit connector (control unit disconnected from the network)

 See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT

Go to Step 2

1. CAN line wiring interrupted

2.Engine control unit connector disconnected.

1. Restore the CAN line continuity

2.Connect the engine control unit connector

If the type of error is 'BUS OFF'

Check for control unit errors using an Examiner in 'CAN information' mode

Check the insulation of the CAN High to earth

Check the insulation of the CAN Low to + battery

Go to Step 3

1. Network control unit faulty (CAN overload)

2. CAN short circuit to earth

3. Short circuit to + battery

1. Continue as instructed by the diagnostic equipment

2. Restore insulation to earth

3. Restore insulation to + battery.

If the error type is "CAN register", replace the engine control unit and check correct operation

 Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R

End of diagnosis