E39 / P0685 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE
The engine may not start.
Main Relay Circuit, Performance Problem
Fault symptom
CHECK ENGINE
The engine may not start.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 11 - 18 V. |
Fault criteria:
| Open circuit or short circuit on the control module output |
Dependent:
System reaction to a fault:
Fault handling:
| (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:
| (See also description of readings/activations in diagnostic tool) |
