E39 / P0451 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
EVAP Tank Pressure Sensor.Performance Problem.
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
| The diagnosis runs after engine shut off. |
Enable criteria:
| Battery voltage greater than 11 V. |
Fault criteria:
| Sensor pressure signal does not match the expected start pressure. |
| The sensor's pressure signal does not drop sufficiently when the EVAP is active. |
Dependent:
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 Tank Pressure Sensor |
| (See also description of readings/activations in diagnostic tool) |
