Circuit Description
The control module contains a removable knock sensor (KS) module which receives the knock sensor input. The knock sensor signal input is filtered by this module before it is input to the controls module. Spark knock is continuously monitored during engine operation. If knock occurs for longer than a calibrated time, this diagnostic trouble code (DTC) will set.
Conditions for Running the DTC
| • | DTC P0327 is not active. |
| • | The engine run time is 120 seconds or more. |
| • | The system voltage is between 10-17.1 volts. |
Conditions for Setting the DTC
The VCM detects engine knock for more than 5 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) the first time the diagnostic runs and fails. |
| • | The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame/Failure Records. |
Conditions for Clearing the MIL or DTC
| • | The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed. |
| • | A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle. |
| • | Use a scan tool in order to clear the DTCs. |
Diagnostic Aids
Check for the following conditions:
| • | A damaged or improperly installed KS module. Check for the following items: |
| - | Bent pins |
| - | Deformed terminals |
| - | KS module not completely seated |
| • | An improperly torqued knock sensor. Torque the knock sensor to
19 N·m (14 lb ft). Refer to
Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. . |
Review the Fail Records vehicle mileage since the diagnostic test last failed to determine how often the conditions occur that caused the DTC to set . This may assist in diagnosing the condition.
An intermittent may be caused by any of the following conditions:
| • | A poor connection |
| • | Rubbed through wire insulation |
| • | A broken wire inside the insulation |
Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittent Conditions in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step ensures that the condition is present.
-
This step checks for an improperly installed Knock Sensor module.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The control module's data is deleted once the Clear Info function is used. Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
|
Important: If you can hear the engine knock, repair the engine mechanical problem before proceeding with this diagnostic.
Does the scan tool indicate the DTC P0325 Failed This Ignition? | -- | |||
3 |
Does the scan tool indicate DTC P0325 test Failed This Ignition? | -- | Go to Diagnostic Aids | |
4 | Check the KS signal circuit wiring for incorrect routing near the secondary wires. Repair as necessary. Did you find a problem? | -- | ||
Check the Knock Sensor module for incorrect installation. Repair as necessary. Refer to VCM Replacement/Programming . Did you find a problem? | -- | |||
6 | Replace the knock sensor module. Refer to VCM Replacement/Programming . Is the action complete? | -- | -- | |
7 |
Does the scan tool indicate the diagnostic Passed? | -- | ||
8 |
Is the action complete? | -- | -- | |
9 |
Does the scan tool indicate the diagnostic Passed? | -- | ||
10 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
