P0324
DTC P0324, P0326, or P06B6
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0324
- Knock Sensor (KS) System Performance
DTC P0326
- Knock Sensor (KS) Performance
DTC P06B6
- Control Module Knock Sensor Processor 1 Performance
Diagnostic Fault Information
Circuit/System Description
The knock sensors enable 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 sensors produce 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 two knock sensor signals. The ECM receives the two knock sensor signals 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 two internal knock sensor processors by verifying a 20 KHz signal generated on the signal circuits is detected on the sensors' low reference circuits.
Conditions for Running the DTCs
P0324 or P0326-Condition 1; Excessive Knock Diagnostic
* Engine speed is between 400 and 8,500 RPM.
* Engine is running for greater than 2 s.
* The number of engine revolutions above the minimum engine speed is least 200 revolutions.
* The engine coolant temperature (ECT) is warmer than -40°C (-40°F).
* The intake air temperature (IAT) sensor 1 is warmer than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
P0324 or P0326-Condition 2; Abnormal Noise Diagnostic and Condition 3; Flat Signal Diagnostic
* Engine speed is at least 8,500 RPM.
* The number of engine revolutions above the minimum engine speed is least 200 revolutions.
* The ECT is warmer than -40°C (-40°F).
* The IAT sensor 1 is warmer than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
P06B6
* Engine speed is between 500 and 5,500 RPM.
* The number of engine revolutions within the engine speed window is least 100 revolutions.
* Engine is running greater than 2 s.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTCs
P0324
The ECM detects that the knock sensor signal's performance is out of the normal expected range due to an excessive engine knock, or abnormal noise, or a flat signal; 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 DTCs Set
* 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 DTCs
DTCs P0324, P0326, and P06B6 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D61)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Engine running, observe the DTC information with a scan tool.
3. Verify DTC P0325, P0327, P0328 and P06B6 is not set.
• IF DTC P0325, P0327, or P0328 is set with P06B6
Refer to DTC P0325, P0327, or P0328 P0325 for further diagnosis.
• If only DTC P06B6 is set
Verify that no external knock sensor circuit issues exist, then; replace the K20 engine control module.
• If none of the DTCs is set
4. Vehicle OFF, inspect for the following:
* The affected 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 [1][2]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
* Loose or broken accessory drive belts, brackets, components
* An engine mechanical condition-Refer to Symptoms - Engine Mechanical Symptoms - Engine Mechanical
• If a condition is found
Repair or replace component as appropriate.
• If no condition is found
5. 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.
• If any of the DTCs set
Test or replace the B68 knock sensor.
• If none of the DTCs set
6. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Knock Sensor Replacement Service and Repair
* Control Module References Control Module References for engine control module replacement, programming, and setup.