DTC P0324-P0333, P06B6, or P06B7
Diagnostic InstructionsDTC Descriptor
DTC P0324

Knock Sensor System Performance

DTC P0325

Knock Sensor 1 Circuit

DTC P0326

Knock Sensor 1 Performance

DTC P0327

Knock Sensor 1 Circuit Low Voltage

DTC P0328

Knock Sensor 1 Circuit High Voltage

DTC P0330

Knock Sensor 2 Circuit

DTC P0331

Knock Sensor 2 Performance

DTC P0332

Knock Sensor 2 Circuit Low Voltage

DTC P0333

Knock Sensor 2 Circuit High Voltage

DTC P06B6

Control Module Knock Sensor Processor 1 Performance

DTC P06B7

Control Module Knock Sensor Processor 2 Performance

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Signal—Terminal 1/A

P0327, P0332, P06B6, P06B7

P0325, P0330

P0328, P0333

P0324*, P0326**, P0331**

Signal—Terminal 2/B

P0327, P0332

P0325, P0330

P0328, P0333

P0324*, P0326**, P0331**

*Signal Performance=High

**Signal Performance=Low

Circuit/System Description

For an overview of the component/system, refer to:Electronic Ignition System Description

Circuit

Description

Signal—Terminal 1/A

The control module input circuit has an internal resistance connected to 5 V.

Signal—Terminal 2/B

The control module input circuit has an internal resistance connected to 1.33 V.

Component

Description

B68 Knock Sensor

The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The amplitude and frequency depend upon the level of knock that the knock sensor detects.

K20 Engine Control Module

The control module controls a series of actuators to ensure optimal vehicle performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the propulsion system actuators accordingly.

The knock sensor measures vibrations of the engine block. To some extent it is comparable to a microphone. The sensor produces an AC voltage that is proportional in frequency and amplitude to the vibrations. The ECM can deduce from the signal if and which cylinder is knocking. This enables the ECM to adjust the spark timing so that the best fuel efficiency is gained. The ECM learns a minimum knock sensor noise level at idle and uses calibrated values for the rest of the engine speed range.

Conditions for Running the DTCP0324
  • Engine=Running—For greater than 2 s
  • Engine Coolant Temperature=Greater than −40°C (−40°F)
  • Engine Speed=400 to 8,500 RPM
  • Mass Air Flow Per Cylinder=400 to 2,000 mg
Condition 2
  • Engine=Running—For greater than 2 s
  • Intake Air Temperature=Greater than −40°C (−40°F)
  • Engine Speed=Greater than 400 RPM—Cumulative=For greater than 500 engine revolutions
  • Mass Air Flow Per Cylinder=400 to 2,000 mg

Frequency the DTC runs=Continuously—After the running conditions are met

P0325, P0330
  • Engine=Running—For greater than 2 s
  • Engine Speed=400 to 8,500 RPM—For greater than 125 engine revolutions
  • Mass Air Flow Per Cylinder=200 to 2,000 mg
  • Engine Coolant Temperature=Greater than −40°C (−40°F)
Condition 2
  • Engine=Running—For greater than 2 s
  • Engine Speed=400 to 8,500 RPM—For greater than 125 engine revolutions
  • Mass Air Flow Per Cylinder=200 to 2,000 mg
  • Intake Air Temperature=Greater than −40°C (−40°F)

Frequency the DTC runs=Continuously—After the running conditions are met

P0326, P0331
  • Engine=Running—For greater than 2 s
  • Engine Coolant Temperature=Greater than −40°C (−40°F)
  • Intake Air Temperature=Greater than −40°C (−40°F)
  • Engine Speed=Greater than 2,250 RPM
  • Mass Air Flow Per Cylinder=30 to 2,000 mg
Condition 2
  • Engine=Running—For greater than 2 s
  • Intake Air Temperature=Greater than −40°C (−40°F)
  • Engine Speed=Greater than 2,250 RPM
  • Mass Air Flow Per Cylinder=Greater than 2,000 mg
  • Engine Speed=Greater than 2,250 RPM—Cumulative=For greater than 125 engine revolutions

Frequency the DTC runs=Continuously—After the running conditions are met

P0327, P0328, P0332, P0333

Engine Speed=Less than 8,500 RPM

Frequency the DTC runs=Continuously—After the running conditions are met

P06B6, P06B7
  • Engine=Running—For greater than 2 s
  • Engine Speed=400 to 8,500 RPM—For greater than 250 engine revolutions
  • Mass Air Flow Per Cylinder=20 to 2,000 mg

Frequency the DTC runs=Continuously—After the running conditions are met

Conditions for Setting the DTCP0324

Knock Sensor Signal=Excessive engine knocking

P0325, P0330

Signal circuit=Open—For greater than 5 s

P0326, P0331

Signal Performance=Low Frequency

P0327, P0332

Signal circuit=Short to Ground—For greater than 5 s

P0328, P0333

Signal circuit=Short to Voltage—For greater than 5 s

P06B6, P06B7

A fault of the processor that evaluates the knock sensor signal was detected.

Actions Taken When the DTC Sets

DTCs listed in the DTC Descriptor category=Type A DTC

The ignition timing is retarded to reduce potentially engine-damaging knocking.

Conditions for Clearing the DTC

DTCs listed in the DTC Descriptor category=Type A DTC

Diagnostic Aids
  • Inspect the knock sensor for physical damage. A damaged sensor may cause a DTC to set.
  • The knock sensor mounting surface should be free of burrs, casting flash, and foreign material.
  • Tightening the retaining bolt too much or simply dropping the knock sensor on the ground can damage it.
Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Master Electrical Component List

Electrical Information ReferenceDTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification
  1. Engine»Running
  2. Verify DTC P0325, P0327, P0328, P0330, P0332, P0333, P06B6, P06B7 is not set
    • If only DTC P0325, P0327, P0328, P0330, P0332, P0333 is set

      Refer to: Circuit/System Testing

    • If only DTC P06B6, P06B7 is set

      Replace the component:K20 Engine Control Module

    • If none of the DTCs are set
  3. Verify the scan tool parameter:Cylinder 1–4 Knock Detected=No

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector(s):B68 Knock Sensor
    • Wiggle the harness and connector(s):K20 Engine Control Module
    • If not the specified state

      Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)

    • If the specified state
  4. Verify DTC P0324, P0326, P0331 is not set
    • If the DTC is set
    1. Verify a condition does not exist with the component:B68 Knock Sensor
      • Incorrect installation»Refer to:Fastener Specifications
      • Interference with other components or objects—Bracket/Engine Wiring Harness/Hoses / Lines
      • Visible Damage
      • If a condition exists » Repair or replace as necessary
      • If no condition exists
    2. Verify the condition did not cause the DTC to set:
      • Accessory drive bracket—Loose/Visible Damage
      • Drive Belt&Belt Driven Device—Loose/Visible Damage
      • Engine—Mechanical Condition»Refer to:Symptoms - Engine Mechanical
      • Fuel—Contaminated/Poor Quality
      • If a condition exists » Repair or replace as necessary
      • If all conditions test normal » Test or replace the component:B68 Knock Sensor
    • If none of the DTCs are set
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets

      Refer to: Circuit/System Testing

    • If the DTC is not set
  6. All OK.
Circuit/System Testing
  1. Ignition/Vehicle » Off
  2. Disconnect the appropriate electrical connector:B68 Knock Sensor
  3. Ignition » On / Vehicle » In Service Mode
  4. Test for 1 to 2 V between the test points:Signal circuit terminal 2/B&Ground
    • If less than 1 V
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 2/B@Component harness&Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:Signal circuit terminal 2/B@Component harness&The other end of the circuit@Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K20 Engine Control Module
    • If greater than 2 V
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 2/B@Component harness&Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K20 Engine Control Module
    • If between 1 and 2 V
  5. Test for 2 to 4 V between the test points:Signal circuit terminal 1/A&Ground
    • If less than 2 V
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 1/A@Component harness&Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:Signal circuit terminal 1/A@Component harness&The other end of the circuit@Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K20 Engine Control Module
    • If greater than 4 V
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 1/A@Component harness&Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K20 Engine Control Module
    • If between 2 and 4 V
  6. Test or replace the component:B68 Knock Sensor
Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification