DTC Descriptor DTC P0324 Knock sensor module performance DTC P0325 Knock sensor circuit bank one DTC P0326 Knock sensor performance DTC P0327 Knock sensor circuit low voltage bank 1 DTC P0328 Knock sensor circuit high voltage bank 1 DTC P0330 Knock sensor circuit bank 2 DTC P0332 Knock sensor circuit low voltage bank 2 DTC Knock sensor circuit high voltage bank 2 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 each knock sensor signal through a 6.0 LITER ENGINE P0324 Page 1 of 7
dedicated circuit. The ECM learns a minimum knock sensor noise level for all the engine speed ranges and monitors the normal knock sensor signal. Conditions for running the DTC P0324 or P0326 Engine speed is between 400 and 8,500 RPM. Engine is running for greater than 2 seconds. The engine coolant temperature (ECT) is 40C ( 40F) or warmer. The intake air temperature (IAT) is 40C ( 40F) or warmer. P0325 Engine speed is between 500 7000 RPM for 67 or more cumulative revolutions. Engine is running for 2 seconds or greater. The engine coolant temperature (ECT) is 40C ( 40F) or warmer. The intake air temperature (IAT) is 40C ( 40F) or warmer. P0326 DTC P0068, P0606, P1516, P2101, P2135, or P2176 are not set. The engine speed is greater than 400 RPM. The manifold absolute pressure (MAP) is greater than 10 kpa. P0327, P0328, P0330, and The engine coolant temperature (ECT) is 40C ( 40F) or warmer. Engine is running for 2 seconds or greater. The DTCs run continuously when the above conditions are met. Conditions for setting the DTC P0324 The ECM has detected an internal fault. P0325 or P0330 The ECM has detected a knock sensor signal circuit is open. 6.0 LITER ENGINE P0324 Page 2 of 7
P0327, P0328, P0332, and The ECM has detected a knock sensor signal circuit is shorted to voltage or ground. Action taken when the DTC sets DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, and are type B codes. The ignition timing is retarded to reduce the potential of engine damaging spark knock. 6.0 LITER ENGINE P0324 Page 3 of 7
Schematic reference 12 Volt Ignition. Refer to OEM Schematics. Wire colors could vary, and intermediate connectors may/may not be present 6.0 LITER ENGINE P0324 Page 4 of 7
Circuit/System verification 1. Engine running. 2. Verify DTC P0324 is not set. If the DTC is set Replace the engine control module (ECM) If the DTC is not set. 3. Ignition off. 4. Verify none of the conditions listed below exist: Knock sensor or wiring harness damage. Incorrect knock sensor installation. Knock sensor and engine mounting surface burs, casting flash, and foreign material. 6.0 LITER ENGINE P0324 Page 5 of 7
Close proximity of hoses, brackets, and engine wiring. Loose brackets. Loose or broken accessory drive belts, brackets, components. An engine mechanical condition. Contaminated or poor quality fuel. If a condition exists Repair or replace as necessary. If no condition exist 5. Verify the scan tool parameters listed below display no while moving the related harnesses and connectors of the knock sensors. Cylinder 1 knock detected Cylinder 2 knock detected Cylinder 3 knock detected Cylinder 4 knock detected Cylinder 5 knock detected Cylinder 6 knock detected Cylinder 7 knock detected Cylinder 8 knock detected If no is not displayed Repair the wiring harness or connectors. If no is displayed 6. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data. If the DTC sets Refer to circuit/system testing If the DTC does not set 7. Proper operation verified. Circuit/system testing 1. Ignition off, disconnect the harness connector at the appropriate knock sensor, ignition on. 2. Test for 2 3 volts between the low signal circuit B and ground. If less than 2 volts 2.1. Ignition off, disconnect the harness connector at the engine control module (ECM). 2.2. Test for infinite resistance between the low signal circuit terminal B and ground. If less than infinite resistance, repair the short to ground on that circuit. 6.0 LITER ENGINE P0324 Page 6 of 7
If infinite resistance 2.3. Test for less than 2 ohms in the low signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the engine control module (ECM). If greater than 3 volts 2.1. Ignition off, disconnect the harness connector at the engine control Module, ignition on. 2.2. Test for less than 1 volt between the low signal circuit and ground. If 1 volt or greater, repair the short to voltage on the circuit. If less than 1 volt, replace the engine control module (ECM). 3. Test for 2 3 volts between the high signal circuit terminal A and ground. If less than 2 volts 3.1. Ignition off, disconnect the harness connector at the engine control module (ECM). 3.2. Test for infinite resistance between the high signal circuit terminal A and ground. If less than infinite resistance, repair the short to ground on that circuit. If infinite resistance 3.3. Test for less than 2 ohms in the high signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the engine control module (ECM). If greater than 3 volts 3.1. Ignition off, disconnect the harness connector at the engine control module (ECM), ignition on. 3.2. Test for less than 1 volt between the high signal circuit and ground. If 1 volt or greater, repair the short to voltage on the circuit. If less than 1 volt, replace the engine control module (ECM). If between 2 3 volts 4. Test or replace the knock sensor. 6.0 LITER ENGINE P0324 Page 7 of 7