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T8 / P0621 00

Read the instructions below then start the fault diagnostic procedure.

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

  P0621 00


Generator L Terminal Circuit, Open

Fault symptom

Charging lamp on with engine running.

Higher idling speed.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.

Fault criteria:

Open circuit on the lead between control module pin B16 and generator pin 1 (D+) for more than 0.5 s.

Dependent:

P0337, P0339

System reaction to a fault:

Control module continues working with the higher idling function.

OK report:

No faults for 7 seconds with the ignition on and 60 seconds of idling.

Fault handling:

Type III without Check Engine.
(See section Fault handling III, "Other emission-related components and functions" for more information.)

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)