Symptom Related Diagnostic Procedures

Symptom Chart

DTC P1146 Low input from the engine control module (ECM) on the voltage regulator request signal wire. Vehicles fitted with 2.5L or 3.0L engine.
Possible Source(s):
- Wiring harness.
- Generator.
- ECM.
Action(s) to take:
- [[G157288p1]]

DTC P1244 Generator overcharging. Vehicles fitted with 2.5L or 3.0L engine.
Possible Source(s):
- Battery.
- Wiring harness.
- Generator.
- Fuse 15 (5A) Primary junction fuse box.
- Circuit.
Action(s) to take:
- [[G157288p2]]

DTC P1632 Charging system failure. Vehicles fitted with 2.5L or 3.0L engine.
Possible Source(s):
- Accessory drive belt.
- Wiring harness.
- Fuse 15 (5A) Primary junction fuse box.
- Circuit.
- Generator.
- Battery.
- ECM.
Action(s) to take:
- CHECK drive belt tension.

DTC P1632 Charging system failure. Vehicles fitted with 4.2L engine.
Possible Source(s):
- Accessory drive belt.
- Wiring harness.
- Electrical connector.
- Fuse 30 (5A) rear power distribution box.
- Battery.
- Generator.
- ECM.
Action(s) to take:
- CHECK drive belt tension.

DTC P1629 Generator load monitoring signal failure. Vehicles fitted with 2.5L or 3.0L engine.
Possible Source(s):
- Electrical connector.
- Wiring harness.
- Generator.
- ECM.
Action(s) to take:
- [[G157288p4]]

The charging system warning indicator is on, intermittent or flickers with the engine running. Vehicles fitted with 4.2L engine.
Possible Source(s):
- Accessory drive belt.
- Wiring harness.
- Fuse 15 (5A) Primary junction fuse box.
- Battery (warning light on with low voltage).
- Generator.
- ECM.
- Instrument cluster (IC).
- Control area network (CAN).
Action(s) to take:
- CHECK drive belt tension.

The charging system warning indicator is on, intermittent or flickers with the engine running. Vehicles fitted with 2.5L or 3.0L engine.
Possible Source(s):
- Accessory drive belt.
- Wiring harness.
- Fuse 15 (5A) Primary junction fuse box.
- Battery (warning light on with low voltage).
- Generator.
- ECM.
- Instrument cluster (IC).
- Control area network (CAN).
Action(s) to take:
- CHECK drive belt tension.

Generator not charging battery keeps going flat.
Possible Source(s):
- Drive belt
- Wiring harness.
- Battery.
- Fuse 15 (5A) Primary junction fuse box.
- Generator.
- Generator pulley (vehicles fitted with manual transmission).
Action(s) to take:
- CHECK drive belt tension.

Generator noisy
Possible Source(s):
- Generator.
- Drive belt.
- Drive belt tensioner
Action(s) to take:
- CHECK drive belt tension.

Radio interference
Possible Source(s):
- Wiring harness
- Generator
Action(s) to take:
- [[G157288p9]]