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T8 / P023D 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp Limp home

  P023D 00


Manifold Absolute Pressure and Charge Air Absolute Pressure, Plausibility Fault.

Fault symptom

Malfunction Indicator Lamp

Limp home

On-board diagnosis

Type of diagnosis:

Once per driving cycle.

Enable criteria:

Ignition ON.
NONE of the following DTCs must be detected: P0107, P0108, P0237 and P0238.
Vehicle speed 0 km/h.
0 rpm.
When these conditions are fulfilled, check the difference between both sensors.

Fault criteria:

Pressure difference between sensors is more than 12 kPa.

Dependent:

None

System reaction to a fault:

Torque limited to max. 170Nm.
Purge blocked.
Boost pressure adaption is blocked and reset.
Correction of mass air flow/combustion for fuel calculation is blocked.
Limited acceleration and idle function.
Cruise control blocked.
Secondary air pump not active, if fitted.

OK report:

Fault criteria NOT fulfilled for 2 s with engine running.

Fault handling:

Type III
(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 faulty sensor.

Functions in the diagnostic tool related to the fault:

Test value:
Manifold absolute pressure sensor
Absolute pressure sensor, charge air

And external barometer.