P0327

KNOCK SENSOR, CYLINDER BANK 1 (REAR)





Fault Symptoms
CHECK ENGINE lamp (MIL) on.
Engine performance may be down, continuous retardation of the ignition timing.

Conditions.
Engine temperature above 45°C.
Engine speed above 2000 rpm.
Voltage variations too small having regard to engine rpm.





Diagnostic Procedure.
1. Check the knock sensor's ground connection
- Unplug the knock sensor's 2-pin connector.
- Connect a test lamp to battery positive (B+) and pin 2. The test lamp should light up.

Did the test lamp light up?

YES: Continue with point 2.
NO: Repair or replace the lead between pin 2 and crimped connection J134. Then continue with point 3.





2. Check the control module's knock sensor input

Take a resistance reading on the connector contacts (towards the control module).

- Turn the ignition switch to the OFF position.
- Take a resistance reading across pins 1 and 2 in the 2-pin connector.

The resistance should be about 1 Mohm.

Is the reading obtained OK?

YES: Check whether the bolt securing the knock sensor is loose.
If it is, tighten it to a torque of 22 Nm. Then continue with point 3.
If it is not loose, change the knock sensor. Then continue with point 3.

NO Check the lead in question and repair or replace it if necessary. Then continue with point 3.





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

Has the diagnostic trouble code recurred?

YES: Continue as described at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO: The steps taken to rectify the fault were correct.