Diagnostic Instructions
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
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Knock Sensor Signal
| P0327, P0328, P0332, P0333
| P0325, P0330
| P0327, P0328, P0332, P0333
| P0326
|
Circuit/System Description
The knock sensor (KS) 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 ECM monitors 2 separate KS, located
under the intake manifold. The KS produces an AC voltage signal that varies depending on the vibration level during engine operation. The ECM receives the KS signal through 2 isolated signal circuits and adjusts the spark timing based on the amplitude and frequency
of the KS signal.
Conditions for Running the DTC
| • | DTC P0324 runs continuously when the engine speed is greater than 2,000 RPM and the engine load is greater than a calibrated amount. |
| • | DTCs P0326 run continuously when: |
| - | The engine speed is greater than or equal to 1,200 RPM |
| - | The MAP is greater than 80 kPa |
| - | DTCs P0120, P0121, P0122, or P0123 are not set |
| • | DTCs P0325, P0330, P0327, P0328, P0332, P0333 run continuously when: |
| - | The engine coolant temperature (ECT) is greater than 75°C (167°F) |
| - | The engine run time is greater than 90 seconds |
Conditions for Setting the DTC
P0324
The ECM has detected an internal circuitry fault.
P0325 and P0330
The KS signal circuits are open or shorted together for up to 6 seconds.
P0326
| • | The KS signal indicates an excessively noisy engine component (e.g. loose bracket, noisy lifter). |
| • | The ECM commanded spark retard, at a given engine load, and speed is more than the calibrated value. |
| • | The above conditions exist for up to 6 seconds. |
P0327, P0328, P0332, and P0333
The KS signal circuits are shorted to voltage or ground.
Actions Taken When the DTC Sets
| • | DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, P0333 are Type B DTCs. |
| • | Spark timing will be retarded to reduce spark knock, and may cause reduced engine power. |
Conditions for Clearing the DTC
DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, P0333 are Type B DTCs.
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. |
Reference Information
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
Circuit/System Testing
P0324
Important: If DTCs P0325, P0327, P0328, P0330, P0332, or P0333 are set, diagnose those DTCs first.
This DTC indicates an internal control module circuitry failure. Replace the ECM.
P0325, P0327, P0328, P0330, P0332, and P0333
- Ignition OFF, disconnect inline harness connector X104 at the back of the engine.
- Ignition ON, measure for 2-3 volts between each of the following circuits on the ECM side of the harness connector and ground.
| • | Knock sensor bank 1 signal circuit terminal G |
| • | Knock sensor bank 1 signal circuit terminal H |
| • | Knock sensor bank 2 signal circuit terminal J |
| • | Knock sensor bank 2 signal circuit terminal K |
| ⇒ | If less than the specified range, test the appropriate circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the appropriate circuit for a short to voltage. If the circuits test normal, replace the ECM. |
- Test the KS circuits on the KS side of the connector for the following:
| • | Short to any other circuit |
- If all circuits test normal, replace the appropriate KS.
P0326
| | Important: If DTCs P0325, P0327, P0328, P0330, P0332, P0333, P0335 or P0336 are also set, diagnose those DTCs first.
|
| • | Inspect for a loose or broken vehicle accessory or accessory bracket. |
| • | Inspect for excessive engine mechanical noise. |
Component Testing
- KS 1--Connect the DMM between the knock sensor signal terminals G and H on the sensor side of the KS inline harness connector X104.
OR
KS 2--Connect the DMM between the knock sensor signal terminals J and K on the sensor side of the KS inline harness connector X104.
- Set the DMM to the 400 mV AC hertz scale and wait for the DMM to stabilize at 0 Hz.
Important: DO NOT tap on plastic engine components.
- Tap on the engine block with a non-metallic object near the KS while observing the signal indicated on the DMM.
- The DMM should display a fluctuating frequency while tapping on the engine block.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
