DTC P0324, P0326, P0327, P0328, P0331, P0332, or P0333
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DTC P0324, P0326, P0327, P0328, P0331, P0332, or P0333
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DTC P0324
Knock Sensor Module Performance
DTC P0326
Knock Sensor 1 Performance
DTC P0327
Knock Sensor 1 Circuit Low Voltage
DTC P0328
Knock Sensor 1 Circuit High Voltage
DTC P0331
Knock Sensor 2 Performance
DTC P0332
Knock Sensor 2 Circuit Low Voltage
DTC P0333
Knock Sensor 2 Circuit High Voltage
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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, P0328
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P0327
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P0328
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P0326
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Knock Sensor 2 Signal
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P0332, P0333
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P0332
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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 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.
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Conditions for Running the DTC
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P0324
This DTC runs continuously when:
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The engine speed is greater than 1,600 RPM.
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The engine load is greater than a calibrated amount.
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DTCs P0326 or P0331 are not set.
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P0326 and P0331
These DTCs run continuously when:
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DTCs P0121, P0122, or P0123 are not set
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P0327, P0328, P0332, P0333
These DTCs run continuously when:
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The engine coolant temperature is greater than -40°C (-40°F)
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The engine run time is greater than 1 s.
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Conditions for Setting the DTC
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P0324
The ECM has detected an internal circuitry fault.
P0326 and P0331
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The knock sensor signal indicates an excessive engine knock is present.
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The ECM commanded spark retard at a given engine load and speed is more than the calibrated value.
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The above conditions exist for up to 6 s.
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P0327, P0328, P0332, and P0333
The knock sensor signal circuits are shorted to ground or power.
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Action Taken When the DTC Sets
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DTCs P0324, P0326, P0327, P0328, P0331, P0332, and P0333 are Type B DTCs.
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Conditions for Clearing the MIL/DTC
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DTCs P0324, P0326, P0327, P0328, P0331, P0332, and P0333 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
P0324
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If P0327, P0328, P0332, or P0333 are also set, perform these diagnostics first.
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This DTC indicates an internal ECM circuitry failure. Replace the K20 ECM.
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P0327, P0328, P0332, and P0333
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1.
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Note
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If the knock sensor lead is damaged in any way, replace the knock sensor.
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Ignition ON, engine OFF.
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2.
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Disconnect the appropriate B68 knock sensor harness connector.
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3.
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Measure for 2-5 V between each of the following circuits and ground on the ECM side of the harness connector:
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The signal circuit, terminal A
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The signal circuit, terminal B
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4.
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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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5.
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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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6.
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If the circuits test normal, replace the B68 knock sensor.
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P0326 and P0331
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Note
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If DTC P0335 or P0336 are also set, diagnose those DTCs first.
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Inspect for a loose or broken vehicle accessory or accessory bracket.
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Inspect for excessive engine mechanical noise.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
