Fault Conditions

Manifold Absolute Pressure Sensor Circuit. Performance Problem.







Fault symptoms
- CHECK ENGINE.
- Engine speed drops slower than normal when accelerator pedal is released.
- Misfiring can occur before trouble code 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 condition for this diagnostic trouble code: Atmospheric pressure must exceed 72 kPa as well as 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 differs 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 air mass/combustion for fuel calculation blocked.
- Charge air adaptation blocked and zeroed.

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 Component & Function
- Type III.

Diagnostic help
Fault diagnosis concerns sensor fault. A very large vacuum leak can generate this diagnostic trouble code.
Functions in the diagnostic tool related to the fault:
- Pressure sensor value, unit kPa. The value should correspond with the other two pressure sensors when the engine is stationary. Accepted difference is 10 kpa.

For information, Tech 2 Menu Structure, DTC Menu, Read Value, Activate, Sys Info

Proceed to Diagnostic Procedures Checking Air Leakage