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Heavy Duty L96




DTC P0324-P0328, P0330-P0333, P06B6, or P06B7 (Heavy Duty L96)

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) Module Performance

DTC P0325
- Knock Sensor (KS) Circuit Bank 1

DTC P0326
- Knock Sensor (KS) Performance

DTC P0327
- Knock Sensor (KS) Circuit Low Voltage Bank 1

DTC P0328
- Knock Sensor (KS) Circuit High Voltage Bank 1

DTC P0330
- Knock Sensor (KS) Circuit Bank 2

DTC P0332
- Knock Sensor (KS) Circuit Low Voltage Bank 2

DTC P0333
- Knock Sensor (KS) Circuit High Voltage Bank 2

DTC P06B6
- Control Module Knock Sensor Processor 1 Performance

DTC P06B7
- Control Module Knock Sensor Processor 2 Performance

Diagnostic Fault Information





Circuit/System Description

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.

Conditions for Running the DTC

P0324, P0326 and P0331-Excessive Knock Detection Mode
* Engine speed is between 400-8,500 RPM.
* Engine is running at least 2 S.
* The engine coolant temperature (ECT) is warmer than -40°C (-40°F).
* The intake air temperature (IAT) is warmer than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.

P0324, P0326 and P0331-Abnormal Noise Detection Mode-Improperly Bolted Knock Sensor
* Engine speed is between 2,500-8,500 RPM.
* Engine is running at least 1 S.
* The ECT is warmer than -40°C (-40°F).
* The IAT is warmer than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.

P0325 and P0330
* Engine speed is between 400-8,500 RPM.
* Engine is running at least 4 S.
* The ECT is warmer than -40°C (-40°F).
* The IAT is warmer than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.

P0327, P0328, P0332, and P0333
* Engine speed is less than 8,500 RPM.
* The DTCs run continuously when the above conditions are met.

P06B6 and P06B7
* Engine speed is between 400-3,500 RPM.
* Engine is running at least 4 S.
* The ECT is warmer than -40°C (-40°F).
* The IAT is warmer than -40°C (-40°F).
* The DTCs run 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 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
* 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 in an entire bank.
* Either of the above conditions exist for greater than 10 s.

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.

Action Taken When the DTC Sets

* DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, P0333, P06B6, and P06B7 are Type B codes.
* The ignition timing is retarded to reduce the potential of engine damaging spark knock.

Conditions for Clearing the DTC

DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, P0333, P06B6, and P06B7 are Type B codes.

Diagnostic Aids

* Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
* Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set.
* The KS mounting surface should be free of burrs, casting flash, and foreign material.
* The KS must be clear of hoses, brackets, and engine electrical wiring.

Reference Information
Schematic Reference

Engine Controls Schematics (except L96) ([1][2]Electrical Diagrams)Engine Controls Schematics (L96) ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Electronic Ignition System Description (Electronic Ignition System Description)
Electrical Information Reference

* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Circuit Testing (Circuit Testing)
* Wiring Repairs (Wiring Repairs)
* Connector Repairs (Connector 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
Special Tools

J 35616 GM Approved Terminal Test Kit

Circuit/System Verification

1. 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°.
2. 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.
3. 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.

Circuit/System Testing

Note:
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using these diagnostic procedures.
* If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical (Symptoms - Engine Mechanical).

P0324, P0326 and P0331
1. Using a scan tool, verify DTCs P0335 or P0336 are not set.

• If any of the DTCs are set, diagnose them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Verify the following conditions do not exist.

* A loose or broken vehicle accessory
* A loose or broken accessory bracket
* Excessive engine mechanical noise

• If any of the conditions exist, repair as necessary.

3. Replace the K20 ECM if no external knock sensor circuit issues exist.

P0325, P0327, P0328, P0330, P0332, and P0333
1. Ignition OFF, disconnect the affected B68 KS.
2. Verify the affected B68 KS is properly tightened, refer to Fastener Tightening Specifications (Fastener Tightening Specifications).
3. 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.
4. 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.

• If the fault follows the sensor in question, replace the appropriate B68 KS.

5. Ignition OFF, remove the jumper wires from the previous step.
6. Ignition ON, measure for 1-4 V between each of the following circuits and ground on the K20 ECM side of the harness connector:

* The B68 KS signal circuit, terminal A or 1
* The B68 KS signal circuit, terminal B or 2

• 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.
• If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.

7. Test for intermittent or poor connections at the ECM, B68 KS, and in-line connectors where present.
8. If all circuits test normal, replace the K20 ECM.

P06B6 or P06B7
1. Using a scan tool, verify the following DTCs are not set: P0325, P0327, P0328, P0330, P0332, and P0333.

• If any of the DTCs are set, diagnose them first.

2. DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Verify the external knock sensor circuits and connectors for proper condition.

• If no external knock sensor circuit issues exist, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Knock Sensor 1 Replacement (Knock Sensor 1 Replacement)
* Knock Sensor 2 Replacement (Knock Sensor 2 Replacement)
* Engine Control Module Replacement (Service and Repair)
* Engine Control Module Programming and Setup (Gasoline Engines) (Testing and Inspection)Engine Control Module Programming and Setup (LGH or LML) (Testing and Inspection)

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