P0330

P0330-KNOCK SENSOR 2 CIRCUIT






For a complete wiring diagram refer to: Electrical Diagrams

When Monitored
Engine running

Set Condition
The Knock Sensor circuit voltage falls below a minimum value at idle or deceleration. The minimum value is from a look-up table internal to the PCM and is based on engine RPM. DTC well also set if the sensor voltage goes above 5.0 volts. One Trip Fault. Three good trips to turn off the MIL. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes
- (K242) KNOCK SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
- (K242) KNOCK SENSOR NO.2 SIGNAL CIRCUIT OPEN
- (K924) KNOCK SENSOR NO.2 RETURN CIRCUIT OPEN
- (K242) KNOCK SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO (K924) KNOCK SENSOR NO.2 RETURN CIRCUIT
- (K242) KNOCK SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO GROUND KNOCK SENSOR
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. ACTIVE DTC





Ignition on, engine not running.
With a scan tool, read DTCs.

Is the DTC active at this time?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
2. (K242) KNOCK SENSOR NO.2 SIGNAL SHORTED TO BATTERY VOLTAGE





Turn the ignition off.
Disconnect the No.2 Knock Sensor harness connector.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K242) Knock Sensor No.2 Signal circuit in the Knock Sensor harness connector.

Does the voltmeter indicate voltage present?
Yes >> Repair the short to battery voltage in the (K242) Knock Sensor No.2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 3
3. (K242) KNOCK SENSOR NO.2 SIGNAL CIRCUIT OPEN





Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K242) Knock Sensor No.2 Signal circuit from the Knock Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
Yes >> Go To 4
No >> Repair the open in the (K242) Knock Sensor No.2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
4. (K924) KNOCK SENSOR NO.2 RETURN CIRCUIT OPEN





Measure the resistance of the (K924) Knock Sensor No.2 Return circuit from the Knock Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
Yes >> Go To 5
No >> Repair the open in the (K924) Knock Sensor No.2 Return circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
5. (K242) KNOCK SENSOR NO.2 SIGNAL SHORTED TO THE (K924) KNOCK SENSOR NO.2 RETURN CIRCUIT





Measure the resistance between the (K242) Knock Sensor No.2 Signal circuit and the (K924) Knock Sensor No.2 Return circuit in the Knock Sensor harness connector.

Is the resistance below 100 ohms?
Yes >> Repair the short between the (K242) Knock Sensor No.2 Signal circuit and the (K924) Knock Sensor No.2 Return circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 6
6. (K242) KNOCK SENSOR NO.2 SIGNAL SHORTED TO GROUND





Measure the resistance between ground and the (K242) Knock Sensor No.2 Signal circuit in the Knock Sensor harness connector.

Is the resistance below 100 ohms?
Yes >> Repair the short to ground in the (K242) Knock Sensor No.2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 7
7. KNOCK SENSOR
Replace the Knock Sensor.
Ignition on, engine not running.
With the scan tool, erase DTC.
Attempt to operate the vehicle using the information noted in the Freeze Frame.
With the scan tool, read DTCs.

Does the scan tool display the DTC that was previously erased?
Yes >>

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module per Service Information.

Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Test Complete.