P0329
DTC P0329 or P0334
DTC Descriptors
DTC P0329
- Knock Sensor (KS) Circuit Bank 1
DTC P0334
- Knock Sensor (KS) Circuit Bank 2
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
The knock sensor (KS) 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 KS 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 KS signal. The ECM receives the KS signal through a signal circuit. The ECM supples a ground circuit to the KS through a low reference circuit. The ECM also supplies a shielded ground circuit to the KS. The ECM learns a KS noise level at idle and uses calibrated values for the rest of the engine speed range. The ECM should monitor a normal KS signal within the noise channel. The circuits between the KS sensor and the ECM consist of the following circuits:
* A KS signal
* A low reference
* A shielded ground
Conditions for Running the DTC
* DTCs P0335, P0336, P0337, P0340, and P0341 are not set.
* The engine coolant temperature (ECT) is more than 65°C (149°F).
* The engine speed is more than 2,496 RPM.
* The mass air flow (MAF) is greater than 251 mg/stk.
* DTCs P0329 and P0334 run continuously once the above conditions are met.
Conditions for Setting the DTC
The ECM detects an incorrect KS signal for more than 4 seconds.
Action Taken When the DTC Sets
DTC P0329 and P0334 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0329 and P0334 are Type B DTCs.
Diagnostic Aids
The following conditions could also set this DTC:
* 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.
* An electromagnetic interference (EMI) condition on the shielded ground circuit
Reference Information
Schematic Reference
Engine Controls Schematics Electrical Diagrams
Connector End View Reference
* Engine Control Module (ECM) Connector End Views Engine Control Module (ECM) Connector End Views
* Engine Controls Connector End Views Engine Controls Connector End Views
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
Diagnostic Trouble Code (DTC) Type Definitions Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
* Scan Tool Data List (w/o Throttle Actuator Control) Scan Tool Data List (w/o Throttle Actuator Control)Scan Tool Data List (w/Throttle Actuator Control) Scan Tool Data List (w/Throttle Actuator Control)
* Scan Tool Data Definitions Scan Tool Data Definitions
* Scan Tool Output Controls Scan Tool Output Controls
Circuit/System Verification
1. Start the engine, observe the DTC information with a scan tool. DTCs P0329 or P0334 should not set.
2. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
Important: If the knock sensor lead is damaged in any way, replace the knock sensor.
1. Ignition OFF, disconnect the harness connector of the appropriate KS.
2. Measure the voltage between the high reference circuit of the KS and ground. Verify that the voltage is less than 1.5 volts.
• If the voltage is above the specified value test for a short to voltage on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
3. Measure the voltage between the low reference circuit of the KS and ground. Verify that the voltage is less than 1.5 volts.
• If the voltage is above the specified value test for a short to voltage on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
4. Measure the resistance between the high reference circuit of the KS and ground. Verify that the resistance is between 96K-107K ohms.
• If the resistance is above the specified value, test for an open/high resistance on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
• If the resistance is below the specified value, test for a short to ground on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
5. Measure the resistance between the low reference circuit of the KS and ground. Verify that the resistance is between 96K-107K ohms.
• If the resistance is above the specified value, test for an open/high resistance on the low reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
• If the resistance is below the specified value, test for a short to ground on the low reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
6. If all circuits/connections test normal, replace the appropriate KS sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Diagnostic Repair Verification after completing the diagnostic procedure.
* Knock Sensor (KS) Replacement Service and Repair
* Control Module References Programming and Relearning for engine control module replacement, setup, and programming