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ME9 / P0451 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp

  P0451 00


EVAP Tank Pressure Sensor.Performance Problem.

Fault symptom

Malfunction Indicator Lamp

On-board diagnosis

Type of diagnosis:

Continuous

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.
Tank purge active.

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:

Test value:
Tank Pressure

(See also description of readings/activations in diagnostic tool)