P0333
DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333
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 provide 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 Frequency Bank 1
DTC P0328
- Knock Sensor (KS) Circuit High Frequency Bank 1
DTC P0330
- Knock Sensor (KS) Circuit Bank 2
DTC P0332
- Knock Sensor (KS) Circuit Low Frequency Bank 2
DTC P0333
- Knock Sensor (KS) Circuit High Frequency Bank 2
Diagnostic Fault Information
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, one on each side of the engine block. Each KS produces an AC voltage that varies, depending on the vibration levels detected during engine operation. The ECM receives the KS signal through 2 isolated signal circuits for each KS. The ECM adjusts the spark timing based on the amplitude and frequency of each KS signal. The ECM learns a minimum noise level for each sensor at idle speeds, and uses calibrated noise level value for the rest of the RPM range. The ECM should monitor a normal KS signal within the noise channel.
Conditions for Running the DTC
P0324
* DTC P0325, P0326, P0327, P0328, P0330, P0332, or P0333 is not set.
* The engine speed is greater than 300 RPM.
* The engine air flow is greater than 50 mg/cylinder.
* DTC P0324 runs continuously when the above conditions are met.
P0325 and P0330
* DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 is not set.
* The engine speed is greater than 400 RPM.
* The engine coolant temperature (ECT) is greater than -40°C (-40°F).
* The engine run time is greater than 2 minutes.
* The power take-off (PTO) is not active.
* DTCs P0325 and P0330 run continuously when the above conditions are met.
P0326
* DTC P0068, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0606, P1516, P2101, P2135, or P2176 is not set.
* The engine speed is greater than 400 RPM.
* The manifold air pressure (MAP) is greater than 10 kPa.
* The power take-off (PTO) is not active.
* DTC P0326 runs continuously when the above conditions are met.
P0327, P0328, P0332, and P0333
* DTC P0112, P0113, P0116, P0117, P0118, or P0128 is not set.
* The engine coolant temperature (ECT) is greater than -40°C (-40°F).
* The engine oil temperature is less than 256°C (492.8°F).
* The engine run time is greater than 2 minutes.
* DTCs P0327, P0328, P0332, and P0333 run continuously when the above conditions are met.
Conditions for Setting the DTC
P0324
The ECM has detected an internal circuitry fault.
P0325 or P0330
The KS signal circuits are open or shorted together for 5 seconds.
P0326
* The KS signal indicates an 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
DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, and P0333 are Type B codes.
Conditions for Clearing the DTC
DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, and P0333 are Type B codes.
Diagnostic Aids
* Inspect the KS for physical damage. A KS that is drop or damage 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 burs, casting flash, and foreign material.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
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 Testing
P0324
Important: If DTCs P0325, P0327, P0328, P0330, P0332, or P0333 are also set, diagnose those DTCs first.
DTC P0324 indicates an internal control module circuitry failure. Replace the ECM.
P0325, P0327, P0328, P0330, P0332, or P0333
1. Ignition ON, engine OFF.
2. Disconnect the appropriate KS harness connector.
3. Measure for 2-3 volts between each of the following circuits and ground on the ECM side of the harness connector.
* The KS signal circuit terminal A
* The KS low reference circuit terminal B
• 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 ECM.
• If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.
4. If all circuits test normal, replace the KS.
P0326
Important: If DTC P0325, P0327, P0328, P0330, or P0333 are also set, diagnose those DTCs first.
* Inspect for a loose or broken engine mount, engine mounted accessory, or accessory mounting bracket.
* Inspect for excessive engine mechanical noise. Refer to Symptoms - Engine Mechanical Symptoms - Engine Mechanical.
Component Testing
1. Connect a DMM to the KS signal circuit and to the KS low reference circuit at the KS.
2. Set the DMM to the 400 mv AC hertz scale and wait for the DMM display 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 Verification Tests after completing the diagnostic procedure.
* Engine Control Module Programming and Setup (LGH or LML) Testing and Inspection
* Engine Control Module Replacement Service and Repair
* Knock Sensor 1 Replacement Knock Sensor 1 Replacement
* Knock Sensor 2 Replacement Knock Sensor 2 Replacement