145 - MiTo   1.4 16v TJet   Alternator signal electrical failure - Circuit short to battery or open   P0621-15   


 

 

 

 

Test results

 

1

 

COMPONENT CONCERNED

 

ELECTRICAL CONNECTION CHECK FOR THE ALTERNATOR AND THE POWERTRAIN CONTROL MODULE

 

OK (NO FAULTS DETECTED)

 

FAULT DETECTED

 

OPERATION

 

 

Electrical connections for alternator and Powertrain Control Module

 

Check for the presence of loose connections on the alternator and the Powertrain Control Module

 

Go to Step 2

 

Presence of loose connections

 

Restore the correct connections

 

2

 

COMPONENT CONCERNED

 

WIRING CONTINUITY CHECK BETWEEN ALTERNATOR AND POWERTRAIN CONTROL MODULE

 

OK (NO FAULTS DETECTED)

 

FAULT DETECTED

 

OPERATION

 

 

Wiring between alternator and Powertrain Control Module

 

With engine off, check for an open circuit on the wiring between the alternator and pin 17 of the Powertrain Control Module

 

Go to Step 3

 

Presence of open circuit

 

Restore the correct continuity of the wiring

 

3

 

COMPONENT CONCERNED

 

WIRING CHECK BETWEEN ALTERNATOR AND POWERTRAIN CONTROL MODULE

 

OK (NO FAULTS DETECTED)

 

FAULT DETECTED

 

OPERATION

 

 

Wiring between alternator and Powertrain Control Module

 

With engine off, check for a short circuit to battery on the wiring between the alternator and pin 17 of the Powertrain Control Module

 

Go to Step 4

 

Presence of short circuit to battery

 

Restore the correct wiring insulation to battery

 

4

 

COMPONENT CONCERNED

 

ALTERNATOR CORRECT OPERATION CHECK

 

OK (NO FAULTS DETECTED)

 

FAULT DETECTED

 

OPERATION

 

 

Alternator

 

Check that the alternator is working properly

 See Test 5530AB ALTERNATOR OPERATION CHECK

 

End of diagnosis

 

Alternator not working properly.

 

Replace the alternator

 Op. 5530A10 ALTERNATOR - R.R.