P06B6
DTC P0324-P0328, or P06B6 (LUJ)
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 Module Performance
DTC P0325
- Knock Sensor Circuit
DTC P0326
- Knock Sensor Performance
DTC P0327
- Knock Sensor Circuit Low Voltage
DTC P0328
- Knock Sensor Circuit High Voltage
DTC P06B6
- Control Module Knock Sensor Processor 1 Performance
Diagnostic Fault Information
Circuit/System Description
The knock sensor 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 alternating current (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 a signal circuit. The ECM supplies a ground circuit to the knock sensor through a low reference circuit. The ECM also supplies a shielded ground circuit to the knock sensor. The ECM learns a knock sensor noise level at idle and uses calibrated values for the rest of the engine speed range. The ECM should monitor a normal knock sensor signal within the noise channel.
Conditions for Running the DTC
P0325, P0327, and P0328
* 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, and P0326 Excessive Knock Detection Mode
* Engine speed is between 580-8 500 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.
P0324 and P0326 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.
P06B6
* 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 DTC runs 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
The knock sensor signal circuits are open for greater than 5 s
P0326
* The signal indicates the sensor harness is connected, but the sensor is not properly bolted to the engine.
* The above condition exist for greater than 10 s.
or
* The knock sensor signal indicates an excessive engine knock is present.
* The above condition exist for greater than 10 s.
P0327
The knock sensor signal circuits are shorted to ground for greater than 5 s.
P0328
The knock sensor signal circuits are shorted to voltage for greater than 5 s.
P06B6
The ECM has detected an internal knock sensor processor fault.
Action Taken When the DTC Sets
* DTCs P0324, P0325, P0326, P0327, P0328, and P06B6 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, and P06B6 are Type B DTCs.
Diagnostic Aids
* Inspect the knock sensor for physical damage and proper installation. 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 (LUJ) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
Description and Operation
Knock Sensor System Description Description and Operation
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 Control Module References for scan tool information
Circuit/System Testing
1. Engine idling, observe the DTC information with a scan tool. Verify DTC P06B6 is not set.
• If the DTC is set, replace the K20 Engine Control Module.
2. Ignition OFF, inspect for the following:
* Inspect the B68 Knock Sensor for physical damage. A B68 Knock Sensor that is dropped or damaged may cause a DTC to set.
* Inspect the B68 Knock Sensor for proper installation. A B68 Knock Sensor that is loose or over torqued may cause a DTC to set. The B68 Knock Sensor should be free of thread sealant. The B68 Knock Sensor mounting surface should be free of burrs, casting flash, and foreign material.
* The B68 Knock Sensor must be clear of hoses, brackets, and engine electrical wiring.
* Inspect for loose accessory brackets.
* Inspect for serpentine belt and tensioner wear.
* Inspect for an engine mechanical condition Symptoms - Engine Mechanical Symptoms - Engine Mechanical.
• If a condition is found, repair as necessary.
3. If there is no mechanical condition, test or replace the B68 Knock Sensor.
4. 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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Knock Sensor Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming and setup