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DTC P0325, P0327, P0328, P0330, P0332, or P0333

DTC P0325, P0327, P0328, P0330, P0332, or P0333

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P0325

Knock Sensor Circuit

DTC P0327

Knock Sensor Circuit Low Voltage

DTC P0328

Knock Sensor Circuit High Voltage

DTC P0330

Knock Sensor 2 Circuit

DTC P0332

Knock Sensor 2 Circuit Low Voltage

DTC P0333

Knock Sensor 2 Circuit High Voltage

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Knock Sensor 1 Signal

P0327

P0325, P06B6

P0328

P0326

Knock Sensor 2 Signal

P0332

P0330, P06B7

P0333

P0331



Circuit/System Description

The knock sensor system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The knock sensor is located on the intake side of the engine block. The knock sensor produces an AC voltage signal that varies depending on the vibration level during engine operation. The ECM receives the knock sensor signal through 2 isolated signal circuits. The ECM adjusts the spark timing based on the amplitude and the frequency of the knock sensor signal.

Conditions for Running the DTC


P0325, and P0330

• Engine speed is between 400-8,500 RPM.

• The ECT is warmer than -40°C (-40°F).

• The IAT is warmer than -40°C (-40°F).

• The DTCs run continuously when the above conditions are met.



P0327, P0328, P0332, and P0333

• Engine speed is between 400-8,500 RPM.

• The DTCs run continuously when the above conditions are met.


Conditions for Setting the DTC

P0325, and P0330

The ECM detects that the knock sensor signal circuits are open for greater than 8 s.

P0327 and P0332

The ECM detects that the knock sensor signal circuits are shorted to ground for greater than 8 s.

P0328 and P0333

The ECM detects that the knock sensor signal circuits are shorted to voltage for greater than 8 s.

Action Taken When the DTC Sets


• DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.

• The ignition timing is retarded to reduce the potential of engine damaging spark knock.


Conditions for Clearing the MIL/DTC

DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.

Diagnostic Aids


• Inspect the knock sensor for physical damage. A knock sensor that is dropped or damaged may cause a DTC to set.

• Inspect the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause a DTC to set. The knock sensor should be free of thread sealant.

• The knock sensor mounting surface should be free of burrs, casting flash, and foreign material.


Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

• Measuring Frequency


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Note
• Perform the Diagnostic System Check - Vehicle prior to using these diagnostic procedures.

• If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical .



P0325, P0327, P0328, P0330, P0332, and P0333

1. Ignition OFF, disconnect the affected B68 KS.

2. Verify the affected B68 KS is properly tightened, refer to Fastener Tightening Specifications (LDK, LHU) .

3. Ignition OFF, with appropriate length jumper wires, connect the B68A KS1 harness to the B68B KS2 sensor and the B68B KS2 harness to the B68A KS1 sensor.

4. Monitor the DTCs using a scan tool. Manoeuvre the vehicle within the conditions for running the DTC. Check that the fault does not follow the current sensor.

5. If the fault follows the sensor in question, replace the appropriate B68 KS.

6. Ignition OFF, remove the jumper wires from the previous step.

7. Ignition ON, measure for 1-4 V between each of the following circuits and ground on the K20 ECM side of the harness connector:

• The B68 KS signal circuit, terminal A or 1

• The B68 KS signal circuit, terminal B or 2

8. If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the K20 ECM.

9. If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.

10. Test for intermittent or poor connections at the ECM, B68 KS, and in-line connectors where present.

11. If all circuits test normal, replace the K20 ECM.


Repair Instructions


• Knock Sensor Replacement (Right Side) Knock Sensor Replacement (Left Side)

• Symptoms - Engine Mechanical

• Symptoms - Engine Controls

• Control Module References for ECM replacement, setup, and programming


Repair Verification

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.