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Home › Isuzu › 1996 › Trooper SE › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Circuit Tests › DTC P0327 - Knock Sensor (KS) Circuit

DTC P0327 - Knock Sensor (KS) Circuit

NOTE: If an engine knock can be heard, repair engine mechanical problem before proceeding with circuit test.
  1. Perform On-Board Diagnostic (OBD) System Check. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Operate vehicle under conditions to allow DTC to set. Using scan tool, monitor SPECIFIC DTC parameter until DTC P0327 test runs. If scan tool indicates DTC P0327, go to step 4). If DTC P0327 is not set, go to next step.
  3. With ignition on and engine off, review and record FAILURE RECORDS for DTC P0327. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, monitor SPECIFIC DTC parameter until DTC P0327 test runs. If scan tool indicates DTC P0327, go to step 4). If DTC P0327 is not set, check for an intermittent problem. See TESTS W/O CODES article.
  4. Check for damaged terminal at KS harness connector. Repair as necessary. Retest system. If KS terminal is okay, go to next step.
  5. Using a test light connected to battery positive terminal, probe KS harness connector (PCM side). If test light comes on, go to next step. If test light does not come on, repair open ground circuit. Retest system.
  6. Ensure ignition is off. Disconnect PCM harness connectors. Check KS signal circuit for poor connection at PCM. Repair as necessary. Retest system. If connections are okay, go to next step.
  7. Using a DVOM, check KS signal circuit between PCM and KS connector for an open, short to voltage or short to ground. Repair as necessary. Retest system. If wire is okay, go to next step.
  8. Reconnect KS harness connector. Using an ohmmeter, measure resistance of KS between signal circuit at PCM harness connector and engine block. If resistance is 100 k/ohms, go to next step. If resistance is not as specified, replace KS. Retest system.
  9. Connect a voltmeter between ground and KS signal circuit at PCM harness connector. Set to AC volts. Measure voltage produced by KS while tapping on engine lift bracket. If an AC voltage is produced, replace PCM. If no voltage is produced, replace KS. Retest system.
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