ME9 / 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:
Enable criteria:
| Battery voltage must be between 10 - 18 V. |
| Fuel level between 15% and 85%. |
| Atmospheric pressure greater than 680 kPa. |
| Difference between atmospheric pressure and boost pressure is less than 480 Pa. |
| In order to run diagnostics, the vehicle must first be run at idling speed and then at a speed up to 30 km/h. |
Fault criteria:
| Sensor pressure signal does not match the expected start pressure. |
| Sensor pressure signal does not drop enough when tank purge is active. Drop less than 80 Pa. |
| Sensor pressure signal oscillates too much. |
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) |
