P0327

KNOCK SENSOR





Fault Symptoms
CHECK ENGINE lamp (MIL) on.
Performance down, continual retardation of the ignition timing.

Conditions.
^ Engine speed > 2500 rpm.
^ Engine temperature > 45°C.
^ Open circuit or short circuit after 5 seconds.

Diagnostic Help.
Check The Wiring.
Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the wiring at several points and in different directions to ascertain whether the wiring harness, including any connectors, is causing the trouble. Observe the multimeter, ISAT scan tool or test lamp while doing this.





Diagnostic Procedure.
1 Check the control module's electrical interface

- Unplug the knock sensor's 2-pin connector.
- Connect a multimeter to:
^ Battery positive (B+) and pin 2
^ pins 1 and 2 about 1 M ohm.

Are the readings OK?

YES:
^ Continue with point 3.

NO:
^ Continue with point 2.





2 Check The Wiring between the knock sensor and control module

- Check that the screening is connected to grounding point G7S.
- Check the leads for continuity between:
^ pin 1 of the connector and pin 71 of the control module
^ pin 2 of the connector and pin 70 of the control module.

Are the readings OK?

YES:
^ Continue with point 4.

NO:
^ Repair or replace the wiring. Continue with point 4.





3 Check the tightening torque

- Check that the sensor is tightened to a torque of 22 Nm.

Is the bolt securing the knock sensor loose?

YES:
^ Tighten the bolt to a torque of 22 Nm. Continue with point 4.

NO:
^ Change the knock sensor. Continue with 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 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 steps taken to rectify the fault were correct.