P0107

MANIFOLD ABSOLUTE PRESSURE SENSOR





Symptom Of Fault.
The CHECK ENGINE lamp (MIL) is on. Impaired driveability. Basic boost pressure only. Possible existence of other DTCs (misfiring, closed loop, boost pressure control).
The A/C compressor does not work.
The turbo/APC gauge gives implausible readings.

Conditions.
P0105: All embracing DTC.

P0106: <50 kPa or >140 kPa when the ignition switch is turned to the ON position or when the engine is running and the pressure is constant for 60 seconds despite throttle position changes.

P0107: Ignition switch in the ON position: <10 kPa for 2 seconds at wide throttle opening.

P0108: Ignition switch in the ON position: >245 kPa for 2 seconds at slight throttle opening.

Diagnostic Help.
^ The turbo/APC gauge is electric and shows the pressure sensor value.
^ The pressure sensor reading can be obtained on an ISAT scan tool.
^ Turn the ignition switch to the ON position and then back to the OFF position.

- Connect an ISAT scan tool.
- Select "READ FUNCTIONS".
- Select "INTAKE PRESSURE".
The reading obtained on the ISAT scan tool should be about 102 kPa.

NOTE: The reading obtained is dependent on the intake air pressure.

- Engine running at idling speed.

If the pressure sensor is in perfect working order the reading obtained on the ISAT scan tool should be 40-60 kPa.

Checking The Wiring
Intermittent faults may occur as a result of occasional short circuits and breaks in the wiring. Jiggle the leads and in-line connectors at several places and in different directions to reveal faults in the wiring, harness. Observe the multimeter, ISAT.





Diagnostic Procedure.
1. Check the vacuum hose
Inspect the vacuum hose between the pressure sensor and intake manifold for breaks, leakage, pinching or clogging.

Is the vacuum hose OK?
YES: continue with point 2.
NO: Rectify the fault and proceed to point 4.

2. Check the pressure sensor's ground connection and power supply
- Turn the ignition switch to the ON position and then back to the OFF position.
- Unplug the pressure sensor's 3-pin connector.
- Take voltage readings in the connector across:

^ Pin 3 and 13: about 5 V
^ B+ and pin 1: about 12 V.

Are all readings OK?
YES: Continue with point 3.
NO: Rectify the lead in question and proceed to point 4.





3. Check the engine control module's pressure sensor input

- Turn the ignition switch to the ON position and then back to the OFF position.
- Unplug the pressure sensor's 3-pin connector.
- Connect an ISAT scan tool.
Select "READ FUNCTIONS".
Select "INTAKE PRESSURE".
The ISAT scan tool reading should be 255 kPa.
- Connect a jumper lead between pins 2 and 1 of the pressure sensor connector.

The ISAT scan tool reading should be 0 kPa.

Are all readings OK?
YES: Change the pressure sensor and continue with point 4.
NO: Rectify the lead in question and proceed to point 4.





4. Final check:

- Clear the diagnostic trouble code.
- Implementation of driving cycle: Drive the car at varying loads and engine rpm for 5 minutes.
- Evaluation of the driving cycle: Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?
YES: Continue at "Before Replacing a Control Module. Component Tests and General Diagnostics
NO: The remedial measure taken was correct.