SAAB WIS ONLINE

P1105

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Engine speed drops slower than normal when accelerator pedal is released.

P1105


Charge Air Absolute Pressure Sensor Circuit. Performance Problem.


Fault symptoms


• CHECK ENGINE.

• Engine speed drops slower than normal when accelerator pedal is released.


On-Board Diagnostics

Type of diagnosis:


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


Enable criteria:


- Engine running. Engine speed exceeding 1500 rpm. Intake manifold pressure exceeding a value that is 5 kPa lower than atmospheric pressure.


Fault criteria:


- Charge air pressure below a value 5 kPa higher than atmospheric pressure. Criteria fulfilled for more than 3 s.


Dependents:


- P0106, P0107, P0108, P1106, P1107, P1108, P1631, P1632, P1633 and P1641.


System reaction to a fault:


- Density compensation of the throttle angle is blocked.


OK report:


- Charge air pressure exceeds atmospheric pressure at any time during the driving cycle.


Fault handling: (See section Fault handling III, other emission-related components and functions for more information.)


- Type III.


Diagnostic help

Fault diagnosis concerns a leak in the hose to the sensor or between the compressor and the throttle body.

Functions in the diagnostic tool related to the fault:


• Diagnostic status for the diagnosis.

• Pressure sensor value, unit kPa.


During acceleration, the value should exceed the value for the two other pressure sensors.

This DTC is generated if the turbocharger is not able to build up pressure when the enable criteria for the diagnosis have been fulfilled. This can be due to any of the following causes:


• Defective turbo unit, e.g. open wastegate valve or sticking turbine shaft.

• Major air leak between turbocharger and throttle body.

This usually results in poor driveability and black exhaust smoke. Even trouble codes indicating misfiring or an adaptation fault may occur in case of a major air leak.

• Catalytic converter or exhaust system blockage.

If the flow of exhaust from the turbocharger is obstructed too much, the turbine speed will not be high enough to provide sufficient boost pressure. This will result in considerably impaired engine performance. Misfiring can also occur, above all at high engine speeds.


See also the description of readings under Menu "Read Values" for more information.