ME9 / P2500 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Charging lamp on with engine running.
Higher idling speed.
Generator L Terminal Control Circuit, Short to Ground
Fault symptom
Charging lamp on with engine running.
Higher idling speed.
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| The lead between control module pin A43 and alternator pin 1 (D+) is short circuited to ground for more than 3 seconds. |
| (Which can be due to either the charge regulator pulling down the L terminal voltage level, to indicate a fault in the generator, or to a short circuit in the cable.) |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Electrical fault in connecting leads or component. |
Functions in the diagnostic tool related to the fault:
| • | Alternator L Terminal Load Dump |
| (See also description of readings/activations in diagnostic tool) |
