Malfunction Indicator Lamp (MIL), Intermittent Check Engine Light On, Engine Spark Knock/Ping (Detonation), DTC P0332 Set (Diagnose and Repair as Necessary)

Some customers may comment on a engine ping noise (commonly referred to as spark knock), usually during acceleration or when the engine is under a load.

Upon investigation, the technician may find DTC P0332 set as current or in history.

If the condition is found to be intermittent, it can be duplicated by performing a brake torque test keeping a constant 2,000 RPM. Do not vary the accelerator pedal. Engine coolant temperature should be more than 60°C (140°F). After more than 30 seconds of engine run time, the DTC should set.

This condition may be caused by the bank 2 knock sensor inline electrical connector not being fully seated.

Perform the following circuit/system test and repair as necessary. This procedure is being provided to aid in reduction of unnecessary knock sensor or control module replacement.

1. Check for a poor connection at the bank 2 knock sensor.
2. Check for good continuity in circuit 1876 between the PCM X2 connector pin 58 and the knock sensor connector. Check for a poor connection at the bank 2 knock sensor inline electrical connector X108. Wiggle both the engine harness side and jumper side of the connector to look for a intermittent connection or a partially broken wire.
3. With the ignition off, disconnect the knock sensor. While the connector is off, ensure that the sensor is properly tightened. Torque should be 18N·m(13 lb ft).
4. Measure the resistance from the knock sensor signal terminal to a good ground with a DMM. If the resistance does not measure 100 ohms +/- 20, replace the knock sensor.

Important: DO NOT tap on plastic engine components.

5. Connect the DMM between the terminal of the sensor. Set the DMM to the 400 Hz scale and let stabilize at 0 Hz. Tap on the engine block with a non-metallic object near the sensor while observing the signal indicated on the DMM. If the DMM does not display a fluctuating frequency while tapping on the engine block, then replace the sensor.
6. Turn the ignition ON with the engine OFF. Set the DMM to DC mV. Measure for 4.2 mV from the sensor signal circuit to a good ground.

•	If over 4.2 mV, turn the ignition OFF, disconnect the control module and test the sensor signal circuit for a short to voltage.

•	If under 4.2 mV, turn the ignition OFF, disconnect the control module and test the sensor signal circuit for an open, short to ground, or high resistance.

7. Check for intermittent or poor connection at the control module. Perform a drag test on the pins at the module connector.
8. If all circuits test normal, replace the control module.

For vehicles repaired under warranty, use: