P06B7
DTC P0324-P0328, P0330-P0333, P06B6, or P06B7 (w/LF1)
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 P0324
- Knock Sensor System Performance
DTC P0325
- Knock Sensor Circuit Bank 1
DTC P0326
- Knock Sensor Performance Bank 1
DTC P0327
- Knock Sensor Circuit Low Voltage Bank 1
DTC P0328
- Knock Sensor Circuit High Voltage Bank 1
DTC P0330
- Knock Sensor Circuit Bank 2
DTC P0331
- Knock Sensor Performance Bank 2
DTC P0332
- Knock Sensor Circuit Low Voltage Bank 2
DTC P0333
- Knock Sensor Circuit High Voltage Bank 2
DTC P06B6
- Control Module Knock Sensor Processor 1 Performance
DTC P06B7
- Control Module Knock Sensor Processor 2 Performance
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 produces an AC voltage signal that varies depending on the vibration level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the knock sensor signal. The ECM receives the knock sensor signal through 2 isolated signal circuits for each bank. The ECM learns a minimum knock sensor noise level for all of the RPM range. The ECM monitors for a normal knock sensor signal. The ECM monitors the internal knock sensor processor by verifying a 20 KHz signal generated on the output circuit is detected on the return circuit.
Conditions for Running the DTC
P0324, P0326 and P0331-Excessive Knock Detection Mode
* Engine speed is between 400-8,500 RPM.
* The engine coolant temperature (ECT) is greater than -40°C (-40°F).
* The intake air temperature (IAT) is greater than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
P0324, P0326 and P0331-Abnormal Noise Detection Mode-Improperly Bolted Knock Sensor
* Engine speed is between 2,200-8,500 RPM.
* The ECT is greater than -40°C (-40°F).
* The IAT is greater than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
P0325, P0327, P0328, P0330, P0332, and P0333
* Engine speed is between 400-8,500 RPM.
* The ECT is greater than -40°C (-40°F).
* The IAT is greater than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
P06B6 and P06B7
* Engine speed is between 400-4,000 RPM.
* The ECT is greater than -40°C (-40°F).
* The IAT is greater than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
P0324
The knock sensor signal indicates an excessive engine knock is present for greater than 10 s for at least 1 single cylinder.
P0325 and P0330
The knock sensor signal circuits are open for greater than 10 s.
P0326 and P0331
* The signal indicates the sensor harness is connected but the sensor is not properly bolted to the engine.
OR
* The knock sensor signal indicates an excessive engine knock is present in an entire bank.
* Either of the above conditions exist for greater than 10 s.
P0327 and P0332
The knock sensor signal circuits are shorted to ground for greater than 10 s.
P0328 and P0333
The knock sensor signal circuits are shorted to voltage for greater than 10 s.
P06B6 and P06B7
The ECM has detected an internal knock sensor processor fault.
Action Taken When the DTC Sets
* DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0331, P0332 P0333, P06B6, and P06B7 are Type B DTCs.
* The ignition timing is retarded to reduce the potential of engine damaging spark knock.
Conditions for Clearing the DTC
DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0331, P0332 P0333, P06B6, and P06B7 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 (LLT) ([1][2]Electrical Diagrams)Engine Controls Schematics (LF1) ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Electronic Ignition System Description (Electronic Ignition System Description)
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)
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 Verification
1. Engine at operating temperature, all accessories OFF, and engine speed greater than 2,000 RPM, observe the Knock Retard and Total Knock Retard parameters. The parameters should be 0°.
2. Engine idling, move the related harnesses and connectors for the KS circuits while observing the scan tool Knock Retard and Total Knock Retard parameters. The parameters should remain steady with no abrupt changes.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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).
P0324
Note: If DTC P0325, P0326, P0327, P0328, P0330, P0332, or P0333 are also set, diagnose those DTCs first.
DTC P0324 indicates an internal control module circuitry failure. Replace the K20 ECM.
P0325, P0326, P0327, P0328, P0330, P0332, P0333
1. Ignition OFF, disconnect the affected B68 KS.
2. Ignition OFF. Connect a DMM to both B68 KS signal circuits, terminals A and B, at the affected B68 KS. Set the DMM to the 400 mV AC scale, select the Hz mode. Let the reading stabilize at 0 Hz.
Note: DO NOT tap on plastic engine components.
3. Tap on the engine block with a non-metallic object near the affected B68 KS and observe the DMM for a fluctuating frequency.
• If the DMM does not display a fluctuating frequency while tapping on the engine block then replace the affected B68 KS.
4. Verify the affected B68 KS is properly tightened, refer to Fastener Tightening Specifications (Specifications).
5. Ignition OFF, with appropriate length jumper wires, connect the B68 KS1 harness to the B68 KS2 sensor and the B68 KS2 harness to the B68 KS1 sensor.
6. 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.
7. Ignition OFF, remove the jumper wires from the previous step.
8. Measure for 1-4 volts 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.
9. Test for intermittent or poor connections at the ECM, B68 KS, and in-line connectors where present.
10. 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 - Bank 1 (Knock Sensor Replacement - Bank 1)
* Knock Sensor Replacement - Bank 2 (Knock Sensor Replacement - Bank 2)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming