ME9 / P0620 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Higher idling speed.
Generator L Terminal Circuit, Function Failure
Fault symptom
Higher idling speed.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| (Generator active means L Terminal high) |
Fault criteria:
| Regulator fault. Period duration is 0%/100% (or internal control module fault). |
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. |
| 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. |
Functions in the diagnostic tool related to the fault:
| • | Alternator L Terminal Load Dump |
| (See also description of readings/activations in diagnostic tool) |
