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ME9 / P2500 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Charging lamp on with engine running. Higher idling speed.

  P2500 00


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:

Continuous

Enable criteria:

Engine running.
Generator active.

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:

Test value:
Alternator L Terminal
Alternator F Terminal

Activation:
Alternator L Terminal Load Dump

(See also description of readings/activations in diagnostic tool)