DTC P0324-P0328, P0330-P0333, P06B6, or P06B7 (LF1, LFW)
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DTC P0324-P0328, P0330-P0333, P06B6, or P06B7 (LF1, LFW)
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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
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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 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.
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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 2,200-8,500 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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P0325, P0327, P0328, P0330, P0332, and P0333
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Engine speed is between 400-8,500 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 400-4,000 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 10 s for at least 1 single cylinder.
P0325 and P0330
The ECM detects that the knock sensor signal circuits are open for greater than 10 s.
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 in an entire bank.
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Either of the above conditions exist for greater than 10 s.
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P0327 and P0332
The ECM detects that the knock sensor signal circuits are shorted to ground for greater than 10 s.
P0328 and P0333
The ECM detects that 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.
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Action Taken When the DTC Sets
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DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0331, P0332 P0333, P06B6, and 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 DTC
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DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0331, P0332 P0333, P06B6, and 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 (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Description and Operation
Electronic Ignition System Description
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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P0325, P0327, P0328, P0330, P0332, and P0333
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1.
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Ignition OFF, disconnect the affected B68 KS.
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3.
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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.
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4.
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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.
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5.
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If the fault follows the sensor in question, replace the appropriate B68 KS.
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6.
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Ignition OFF, remove the jumper wires from the previous step.
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7.
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Ignition ON, measure for 1-4 V between each of the following circuits and ground on the K20 ECM side of the harness connector:
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The B68 KS signal circuit, terminal A or 1
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The B68 KS signal circuit, terminal B or 2
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8.
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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.
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9.
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If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
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10.
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Test for intermittent or poor connections at the ECM, B68 KS, and in-line connectors where present.
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11.
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If all circuits test normal, replace the K20 ECM.
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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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2.
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If any of the DTCs are set, diagnose them first.
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3.
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DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Verify the external knock sensor circuits and connectors for proper condition.
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4.
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If no external knock sensor circuit issues exist, replace the K20 ECM.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
