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DTC P0324, P0326, or P06B6

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0324: Knock Sensor System Performance

DTC P0326: Knock Sensor Performance

DTC P06B6: Control Module Knock Sensor Processor Performance

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Knock Sensor Signal

P0327

P0325

P0328

P0326

Knock Sensor Low Reference

P0327

P0325, P06B6

P0328

P0326

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 2 isolated circuits. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges. 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 signal circuit is detected on the sensor low reference circuit.

Conditions for Running the DTC

P0324 and P0326-Condition 1

    • Engine speed is between 600 and 8,500 RPM.
    • Engine is running for greater than 2 s.
    • The engine coolant temperature (ECT) is warmer than -40°C (-40°F).
    • The inlet air temperature (IAT) is warmer than -40°C (-40°F).
    • The DTCs run continuously when the above conditions are met.

P0326-Condition 2

    • Engine speed is greater than 2,000 RPM.
    • Engine is running for greater than 1 s.
    • The ECT is warmer than -40°C (-40°F).
    • The IAT is warmer than -40°C (-40°F).
    • The DTC runs continuously when the above conditions are met.

P06B6

    • Engine speed is between 600 and 5,000 RPM.
    • Engine is running greater than 5 s.
    • The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0324

The ECM detects that the knock sensor signal indicates an excessive engine knock or noise is present in at least a single cylinder.

P0326

    • 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
    • The ECM detects that the knock sensor signal indicates an excessive engine knock is present.

P06B6

The ECM has detected an internal knock sensor processor fault.

Action Taken When the DTC Sets
    • DTCs P0324, P0326, 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, P0326, and P06B6 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Engine running, observe the DTC information with a scan tool. Verify DTC P0325, P0327, P0328, and P06B6 is not set.
    2. ⇒If DTC P0325, P0327, or P0328 is set with P06B6, refer to DTC P0325, P0327, or P0328 for further diagnosis.
    ⇒If DTC P06B6 is set, and no external knock sensor circuit issues exist, replace the K20 ECM.
  2. Vehicle OFF, inspect for the following:
    3. • The B68 knock sensor for physical damage. A sensor that is dropped or damaged may cause a DTC to set
    • The sensor for proper installation. A sensor that is loose or not at the correct torque may cause a DTC to set. Refer to Fastener Tightening Specifications .
    • The sensor mounting surface for burrs, casting flash, and foreign material
    • The sensor must be clear of hoses, brackets, and engine electrical wiring
    • Loose brackets
    • Water pump and belt
    • An engine mechanical condition--Refer to 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 after completing the diagnostic procedure.

    •  Knock Sensor Replacement
    • Control Module References for ECM replacement, setup, and programming
   


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