LEMON Manuals: Even more car manuals for everyone
Home >> Isuzu >> 1999 >> Trooper Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P0327: Knock Sensor (KS) Circuit >> Diagnostic Aids

Diagnostic Aids

If DTC cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC DIAGNOSTIC PROCEDURES article. 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 next step. If DTC P0327 is not set, check for an intermittent problem. See DIAGNOSTIC AIDS .
  4. Check for damaged terminal at KS harness connector. Repair as necessary. Retest system. If KS harness connector is okay, go to next step.
  5. Connect test light between battery positive terminal and KS harness connector Black/Blue wire (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. 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 100 k/ohms, replace KS. Retest system.
  9. Set voltmeter to AC scale. Connect voltmeter between ground and KS signal circuit at PCM harness connector. 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.
scientia non olet · About LEMON Manuals