ME9 / P0091 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
Fuel Pump Module, Control Circuit, Short to Ground
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Motor running more than 5 s. |
Fault criteria:
| When the voltage at the output during ignition is lower than 2.15 V or lower than 2.35 V with the engine running. |
OK report:
| No fault for 240 seconds. |
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:
| • | Fuel Pump Control Signal |
| • | Signal from Variable Fuel Pump |
| (See also description of readings/activations in diagnostic tool) |
