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DTC P0325: Knock Sensor (KS) Circuit: Troubleshooting

TROUBLESHOOTING CHART

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD II) System Check.
Was the check performed?		 - Go to Step 2 Go to On-Board Diagnostic (OBD II) System Check
2
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Clear the Diagnostic Trouble Codes (DTCs).
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Setting the DTC as noted.

Is the DTC set again?		 - Go to Step 3 Go to Step 6
3 Listen to the engine while rising and lowing the engine speed.
Is a knock or audible noise present?		 - Go to Step 4 Go to Step 5
4 Repair mechanical engine problem or a loose bracket or components as needed.
Is the repair complete?		 - Go to Step 11 -
5
  1. Turn the ignition OFF.
  2. Disconnect the Engine Control Module (ECM) connector.
  3. With a ohmmeter connected ground, measure the resistance of the Knock Sensor (KS) through the KS signal circuit, terminal E22.

Is the resistance between the specified value?		 90 - 110 kΩ Go to Step 6 Go to Step 8
6 Check for a poor connection at the ECM connector KS signal circuit and repair as needed.
Is the repair complete?		 - Go to Step 11 Go to Step 7
7
  1. Turn the ignition OFF.
  2. Replace the ECM.

Is the repair complete?		 - Go to Step 11 -
8 Check the KS connector for a poor connection and repair as needed.
Is the repair complete?		 - Go to Step 11 Go to Step 9
9 Check the KS signal circuit for an open or a short to ground or voltage and repair as needed.
Is the repair complete?		 - Go to Step 11 -
10
  1. Turn the ignition OFF.
  2. Replace the KS.

Is the repair complete?		 - Go to Step 11 -
11
  1. Using the scan tool, clear the DTCs.
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the conditions for setting this DTC as supported in the text.

Does the scan tool indicate that this diagnostic ran and passed?		 - Go to Step 12 Go to Step 2
12 Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?		 - Go to applicable DTC table System OK
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