P0333
DTC P0325, 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 provides an overview of each diagnostic category.
DTC Descriptors
DTC P0325
-
Knock Sensor (KS) Circuit Bank 1
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/System Description
The knock sensors enable 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 knock sensors produce an alternating current (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 two knock sensor signals. The ECM receives the two knock sensor signals through 2 isolated circuits. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges. The ECM monitors for a normal knock sensor signal. The ECM monitors the two internal knock sensor processors by verifying a 20 KHz signal generated on the signal circuits is detected on the sensors' low reference circuits.
Conditions for Running the DTCs
P0325 and P0330
* Engine speed is between 400 and 8,500 RPM.
* Engine is running at least 2 s.
* The ECT is warmer than -40°C (-40°F).
* The IAT sensor 1 is warmer than -40°C (-40°F).
* The DTCs run continuously when the above conditions are met.
P0327, P0328, P0332, and P0333
* Engine speed is less than 8,500 RPM.
* The DTCs run continuously when the above condition is met.
Conditions for Setting the DTCs
P0325 and P0330
The ECM detects that a knock sensor signal circuit is open for longer than 6 s.
P0327 and P0332
The ECM detects that a knock sensor signal circuit is shorted to ground for longer than 6 s.
P0328 and P0333
The ECM detects that a knock sensor signal circuit is shorted to voltage for longer than 6 s.
Action Taken When the DTCs Set
* DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.
* The ignition timing is retarded to reduce the potential of engine damaging spark knock.
Conditions for Clearing the DTCs
DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.
Diagnostic Aids
* Inspect the affected knock sensor for physical damage. A sensor that is dropped or damaged may cause a DTC to set.
* The sensor mounting surface must be free of burrs, casting flash, and foreign material.
* The sensor must be clear of hoses, brackets, and engine electrical wiring.
Reference Information
Schematic Reference
Engine Controls Schematics (LFX) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly - Primary
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Circuit Testing Circuit Testing
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector 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 Verification
1. Engine running, observe the DTC information with a scan tool. Verify DTC P0325, P0327, P0328, P0330, P0332, P0333, P06B6, and P06B7 are not set.
• If DTC P0325, P0327, P0328, P0330, P0332, or P0333 is set with P06B6 or P06B7 continue with Circuit/System Testing.
• If only DTC P06B6 or P06B7 is set, and no external knock sensor circuit issues exist, replace the K20 engine control module.
2. Move the related harnesses and connectors for the affected knock sensor circuits while observing the scan tool parameters listed below. The parameters should display NO.
* Cylinder 1 Knock Detected
* Cylinder 2 Knock Detected
* Cylinder 3 Knock Detected
* Cylinder 4 Knock Detected
* Cylinder 5 Knock Detected
* Cylinder 6 Knock Detected
• If the parameters change, repair the wiring or the harness connectors.
3. Observe the DTC information with a scan tool. DTC P0325, P0327, P0328, P0330, P0332, or P0333 should not set.
4. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
Circuit/System Testing
1. Verify the affected B68 knock sensor is properly tightened, refer to Fastener Tightening Specifications Specifications.
• If not the specified value, correct the condition as appropriate.
2. Vehicle OFF, disconnect the harness connector at the B68 knock sensor.
3. Ignition ON, measure for 1-4 V between each of the following circuits and ground on the K20 engine control module side of the harness connector:
* The signal circuit, terminal 1
* The low reference circuit, terminal 2
• 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 K20 engine control module.
• If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 engine control module.
4. If all circuits test normal, replace the B68 knock sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Knock Sensor Replacement - Bank 1 Knock Sensor Replacement - Bank 1
* Knock Sensor Replacement - Bank 2 Knock Sensor Replacement - Bank 2
* Control Module References Control Module References for engine control module replacement, programming, and setup.