T8 / P0625 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Higher idling speed.
Generator F terminal Circuit, Open/Short to Ground
Fault symptom
Higher idling speed.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Engine speed under 3000 rpm. |
| (Generator active means L Terminal high) |
Fault criteria:
| Period length below 0.5% for more than 30 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:
System reaction to a fault:
| Control module continues working with the higher idling function. |
OK report:
| Fault criteria NOT fulfilled for 31 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:
| • | Alternator L Terminal Load Dump |
| (See also description of readings/activations in diagnostic tool) |
