P0332

DTC P0325, P0327, or P0332

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptors
DTC P0325
- Knock Sensor (KS) Module Performance

DTC P0327
- Knock Sensor (KS) Circuit Bank 1

DTC P0332
- Knock Sensor (KS) Circuit Bank 2




Diagnostic Fault Information






Typical Scan Tool Data






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 a signal circuit. 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 DTCs

* DTC P0016, P0101, P0102, P0103, P0116, P0117, P0118, P0120, P0128, P0220, P0335, P0336, P0340, P0341, P0608, P1125, P1516, P2101, P2108, P2120, P2125, P2135, or P2138 is not set.
* The engine speed is between 1,000-5,000 RPM.
* The throttle position (TP) indicated angle is more than 10 percent.
* The engine load is more than 40 percent.
* The engine coolant temperature (ECT) is more than 60°C (140°F).
* The knock retard is less than 15 degrees.
* The ignition 1 signal is more than 9 volts.
* The engine run time is more than 30 seconds.
* DTC P0325, P0327, and P0332 run continuously when the above conditions are met.



Conditions for Setting the DTC

P0325

The control module detects a malfunction in the KS diagnostic circuitry that will not allow proper diagnosis of the KS system.

P0327 or P0332

The KS signal is outside of the assigned noise channel or the KS signal is not present for more than 0.5 second.


Action Taken When the DTC Sets

DTC P0325, P0327, and P0332 are Type B DTCs.


Conditions for Clearing the MIL/DTC

DTC P0325, P0327, and P0332 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.



Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Testing

Important:
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.

* If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical (- Symptoms - Engine Mechanical).




1. Test for an intermittent and for a poor connection at the affected KS.
2. With the ignition OFF, disconnect the affected KS.
3. With the ignition OFF, measure the resistance for infinite ohms from the sensor signal terminal on the KS to a good ground with a DMM.

• If resistance does not measure infinite ohms, replace the affected KS.


Important: DO NOT tap on plastic engine components.


4. Connect the DMM between the terminal of the affected KS. Set the DMM to the 400 Hz scale, let stabilize at 0 Hz. Tap on engine block with a non-metallic object near the affected KS while observing the signal indicated on the DMM.

• If the DMM does not display a fluctuating frequency while tapping on the engine block then replace the affected KS.

5. Turn the ignition ON, engine OFF. Set the DMM to the DC voltage scale. Measure for 4.2 volts from the KS signal circuit to a good ground with the DMM.

• If over 4.2 volts, turn the ignition OFF, disconnect the control module and test the KS signal circuit for a short to voltage.
• If under 4.2 volts, turn the ignition OFF, disconnect the control module test the KS signal circuit for an open, short to ground, or high resistance.

6. Test for intermittent or poor connections at the control module.
7. If all circuits test normal, replace the control module.



Repair Instructions

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

* Knock Sensor 1 Replacement (Service and Repair)
* Knock Sensor 2 Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for PCM replacement, setup, and programming