DTC P0324, P0326, P0331, P06B6, or P06B7
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DTC P0324, P0326, P0331, P06B6, or P06B7
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DTC P0324
Knock Sensor Module Performance
DTC P0326
Knock Sensor 1 Performance
DTC P0331
Knock Sensor 2 Performance
DTC P06B6
Control Module Knock Sensor Processor 1 Performance
DTC P06B7
Control Module Knock Sensor Processor 2 Performance
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Knock Sensor 1 Signal
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P0327
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P0325, P06B6
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P0328
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P0326
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Knock Sensor 2 Signal
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P0332
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P0330, P06B7
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P0333
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P0331
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Circuit/System Description
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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 alternating current signal that varies with the level of vibration with the engine running. The ECM adjusts the spark timing to the amplitude and frequency in the knock sensor signal. The ECM receives the knock sensor signals via 2 isolated signal circuits for each bank. The ECM learns a minimum knock sensor noise level for the entire speed range. The ECM monitors a normal knock sensor signal. The ECM monitors the internal knock sensor processor by verifying that a 20 kHz signal generated on the outgoing circuit is detected on the return circuit.
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Conditions for Running the DTC
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P0324, P0326 and P0331-Excessive Knock Detection Mode
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Engine speed is between 400-8,500 RPM.
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The engine coolant temperature (ECT) is warmer than -40°C (-40°F).
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The intake air temperature (IAT) is warmer than -40°C (-40°F).
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The DTCs run continuously when the above conditions are met.
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P0324, P0326 and P0331-Abnormal Noise Detection Mode-Improperly Bolted Knock Sensor
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Engine speed is between 2,000-8,500 RPM.
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The ECT is warmer than -40°C (-40°F).
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The IAT is warmer than -40°C (-40°F).
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The DTCs run continuously when the above conditions are met.
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P06B6 and P06B7
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Engine speed is between 400-5,000 RPM.
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The ECT is warmer than -40°C (-40°F).
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The IAT is warmer than -40°C (-40°F).
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The DTCs run continuously when the above conditions are met.
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Conditions for Setting the DTC
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P0324
The ECM detects that the knock sensor signal indicates an excessive engine knock is present for greater than 8 s for at least 1 single cylinder.
P0326 and P0331
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The ECM detects that the knock sensor signal indicates the sensor harness is connected but the sensor is not properly bolted to the engine.
OR
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The ECM detects that the knock sensor signal indicates an excessive engine knock is present for more than 1 single cylinder.
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Either of the above conditions exist for greater than 8 s.
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P06B6 and P06B7
The ECM has detected an internal knock sensor processor fault.
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Action Taken When the DTC Sets
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DTCs P0324, P0326, P0331, P06B6, or P06B7 are Type B DTCs.
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The ignition timing is retarded to reduce the potential of engine damaging spark knock.
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Conditions for Clearing the MIL/DTC
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DTCs P0324, P0326, P0331, P06B6, or P06B7 are Type B DTCs.
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Inspect the knock sensor for physical damage. A knock sensor that is dropped or damaged may cause a DTC to set.
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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.
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The knock sensor mounting surface should be free of burrs, casting flash, and foreign material.
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Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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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°.
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2.
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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.
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3.
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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.
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P0324, P0326 and P0331
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1.
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Using a scan tool, verify DTCs P0335 or P0336 are not set.
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3.
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Verify the following conditions do not exist.
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A loose or broken vehicle accessory
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A loose or broken accessory bracket
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Excessive engine mechanical noise
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4.
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If any of the conditions exist, repair as necessary.
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5.
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Replace the K20 ECM if no external knock sensor circuit issues exist.
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P06B6 or P06B7
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1.
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Using a scan tool, verify the following DTCs are not set: P0325, P0327, P0328, P0330, P0332, and P0333.
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3.
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DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Replace the K20 ECM if no external knock sensor circuit issues exist.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
