P0325
DTC P0325, P0327, P0328, P0330, P0332, or P0333 (LDK, LHU With Turbocharger) (2.0L With Turbocharger)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (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/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 ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
* Measuring Frequency (Measuring Frequency)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
Note:
* Perform the Diagnostic System Check - Vehicle (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 (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) (Fastener Tightening Specifications).
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. Operate the vehicle within the conditions for running the DTC. Verify the fault does not follow the sensor in question.
• If the fault follows the sensor in question, replace the appropriate B68 KS.
5. Ignition OFF, remove the jumper wires from the previous step.
6. 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
• 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.
• If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
7. Test for intermittent or poor connections at the ECM, B68 KS, and in-line connectors where present.
8. If all circuits test normal, replace the K20 ECM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Knock Sensor Replacement (Left Side) (Knock Sensor Replacement (Left Side))Knock Sensor Replacement (Right Side) (Knock Sensor Replacement (Right Side))
* Symptoms - Engine Mechanical (Symptoms - Engine Mechanical)
* Symptoms - Engine Controls (Symptoms - Engine Controls)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming