P0328
DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333
DTC Descriptors
DTC P0324
- Knock Sensor (KS) Module Performance
DTC P0325
- Knock Sensor (KS) Circuit Bank 1
DTC P0326
- Knock Sensor (KS) Performance Bank 1
DTC P0327
- Knock Sensor (KS) Circuit Low Bank 1
DTC P0328
- Knock Sensor (KS) Circuit High Bank 1
DTC P0330
- Knock Sensor (KS) Circuit Bank 2
DTC P0332
- Knock Sensor (KS) Circuit Low Bank 2
DTC P0333
- Knock Sensor (KS) Circuit High Bank 2
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
Circuit/System Description
The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The sensors are located below each cylinder head on the engine block. The KS produces an AC voltage signal that varies depending on the vibration level during engine operation. The control module adjusts the spark timing based on the amplitude and the frequency of the KS signal. The control module receives the KS signal through 2 isolated signal circuits. The control module learns a minimum KS noise level at idle and uses calibrated values for the rest of the RPM range. The control module should monitor a normal KS signal within the noise channel.
Conditions for Running the DTC
* DTC P0325, P0330, and P0326 run continuously when the engine speed is greater than 1,800 RPM, and the manifold absolute pressure (MAP) is greater than 55 kPa.
* DTC P0324, P0327, P0328, P0332, and P0333 run continuously when the ignition is ON or the engine is running.
Conditions for Setting the DTC
P0324
The control module has detected an internal circuitry fault.
P0325 and P0330
The KS signal circuits are open or shorted together for 5 seconds.
P0326
* The KS signal indicates an excessive engine knock is present.
* The ECM has commanded the spark retard to a value, which is more than the calibrated valve, for a specific engine load and speed.
* The above conditions exist for more than 5 seconds.
P0327, P0328, P0332, and P0333
The KS signal circuits are shorted to voltage or ground.
Action Taken When the DTC Sets
DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332 and P0333 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332 and 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 should be free of thread sealant. 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.
Circuit/System Testing
P0324
* If DTCs P0327, P0328, P0332, and P0333 are also set, perform those diagnostics first.
* This DTC indicates an internal control module circuitry failure. Replace the engine control module (ECM).
P0325, P0327, P0328, P0330, P0332, P0333
1. Turn OFF the ignition.
2. Disconnect the KS.
3. Measure for infinite resistance from the KS signal circuit on the sensor side of the KS harness connector to a good ground with the DMM.
4. Measure for infinite resistance from the KS low reference circuit on the sensor side of the KS harness connector to a good ground with the DMM.
^ If the circuits are grounded, repair the short to ground.
5. Turn ON the ignition, with the engine OFF.
6. On the control module side of the KS harness connector, measure the DC voltage from the KS signal circuit to a good ground with a DMM.
7. On the control module side of the KS harness connector, measure for 2.5 DC volts from the KS low reference circuit to a good ground with a DMM.
^ If the KS signal circuit or the KS low reference circuit measures more than the specified range, inspect for a short to voltage. If the circuit tests normal, replace the control module.
8. Test the KS signal circuit and the KS low reference circuit for the following conditions:
* An open
* A short to ground
* High resistance
* KS circuits shorted together
^ If the circuits and the sensor test normal, replace the control module.
P0326
* If DTC 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
1. Connect the DMM from the KS signal circuit to the KS low reference circuit on the sensor side of the KS harness connector.
2. 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.
3. Tap on the engine block with a non-metallic object near the KS while observing the signal indicated on the DMM.
4. 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. Verification Tests
* Refer to Programming and Relearning Programming and Relearning
* Knock Sensor Replacement - Bank 1
* Knock Sensor Replacement - Bank 2