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T8 / P0626 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Higher idling speed.

  P0626 00


Generator F terminal Circuit, Short to B+

Fault symptom

Higher idling speed.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.
Engine speed under 3000 rpm.
Generator active.
(Generator active means L Terminal high)

Fault criteria:

Period length exceeds 6.5% for more than 3 s.
Generator connection for field current (DF). Originates in the internal regulator and shows the amount of period length for which the generator applies field current. Used to calculate generator torque requirement.

Dependent:

P0337, P0339
P0621, P2500, P2501

System reaction to a fault:

Control module continues working with the higher idling function.

OK report:

Fault criteria NOT fulfilled for 4 s.

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 F Terminal
Alternator L Terminal

Activation:
Alternator L Terminal Load Dump

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