Symptom Related Diagnostic Procedures

Symptom chart

DTC P1146 Low input from the Engine control module (ECM) on the voltage regulator request signal wire

Possible Source(s):
- Circuit.
- Generator.
- ECM.
Action(s) to take:
- GO to Pinpoint Test B.

DTC P1244 Generator overcharging

Possible Source(s):
- Generator.
- Circuit.
- Battery.
Action(s) to take:
- GO to Pinpoint Test C.

DTC P1629 Generator load monitoring signal failure

Possible Source(s):
- Circuit.
- Generator.
- ECM.
Action(s) to take:
- GO to Pinpoint Test D.

DTC P1632 Charging system failure

Possible Source(s):
- Fuse 82 (20A).
- Circuit.
- Generator.
- Battery.
- ECM.
Action(s) to take:
- GO to Pinpoint Test A.

The charging system warning indicator is on, intermittent or flickers with the engine running

Possible Source(s):
- Accessory drive belt.
- Fuse 82 (20A).
- Circuit.
- Generator.
- Generator pulley (vehicles fitted with manual transmission).
- Battery.
- ECM.
- Instrument cluster (IC).
- Control area network (CAN).
Action(s) to take:
- CHECK the accessory drive belt tension.
- GO to Pinpoint Test A.

Generator not charging, battery keeps going flat

Possible Source(s):
- Accessory drive belt.
- Fuse 82 (20A).
- Circuit.
- Generator.
- Generator pulley (vehicles fitted with manual transmission).
- Battery.
Action(s) to take:
- CHECK drive belt tension.
- GO to Pinpoint Test A.

Generator noisy

Possible Source(s):
- Accessory drive belt.
- Accessory drive belt tensioner.
- Generator pulley (vehicles fitted with manual transmission).
Action(s) to take:
- CHECK the accessory drive belt and tensioner.
- GO to Pinpoint Test G.

Radio interference

Possible Source(s):
- Circuit.
- Generator.
Action(s) to take:
- GO to Pinpoint Test H.