Conditions

Manifold Absolute Pressure Sensor Circuit. Performance Problem.





Fault symptoms
- CHECK ENGINE.
- Engine speed drops slower than normal when the accelerator is released
- Possible misfiring before DTC is generated.

On-Board Diagnostics

Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:





- General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperature must exceed -7 °C.
- Test 1: Crankshaft stationary, even after ignition OFF. Car stationary. The difference in pressure between the other two absolute pressure sensors in the system less than 10 kPa.
- Test 2: Engine running. Engine speed above 1300 rpm. Engine load lower than 110 mg/c. Accelerator pedal fully released.

Fault criteria:
- Test 1: Sensor value deviates more than 15 kPa from atmosphere absolute pressure sensor.
- Test 2: Sensor value exceeds 50 kPa.

Dependents:
- P0336 and P0337.

System reaction to a fault:
- Purging blocked. Correction of the air mass/combustion for fuel calculation is blocked. Charge pressure adaptation is blocked and reset.

OK report:
- Test 1 and Test 2 performed once and fault criteria not fulfilled. Fault criteria for P0107 or P0108 not fulfilled.

Fault handling: Fault Handling III, Other Emission-Related Comp. & Function
- Type III.

Diagnostic help
Fault diagnosis concerns sensor fault. A very large vacuum leak can generate the DTC.

Diagnostic tool functions related to this fault are:
- Pressure sensor reading, in kPa. With the engine switched off, this reading should be the same as those for the other two pressure sensors. Permissible variance is 10 kPa.

See also the description of test values under "Fault diagnosis, general" for more information.
Tech 2 Menu Structure, DTC Menu, Read Value, Activate, Sys Info

Proceed to Diagnostic Procedures Checking Air Leakage