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Home › Saturn › 1998 › SW2 Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Diagnostic Trouble Codes › DTC P0327 - Knock Sensor Circuit Malfunction › Diagnostic Procedures

Diagnostic Procedures

  1. Start and idle engine. Connect scan tool. Using scan tool, observe KS active noise counter while accelerating engine. If noise channel value increases with RPM, problem is intermittent. See DIAGNOSTIC AIDS. If noise channel value does not increase with RPM, go to next step.
  2. Turn engine off. Disconnect KS harness connector. Turn ignition on, with engine off. Connect test light battery voltage. Using test light, momentarily touch and release KS harness connector terminal. Repeat several times while observing noise channel on scan tool. If noise channel value changes, check for terminal tightness at sensor or faulty sensor. If noise channel value does not change, go to next step.
  3. If test light illuminates when probing KS harness connector terminal, go to next step. If test light does not illuminate when probing KS harness connector terminal, check for open in circuit, terminal tightness at PCM or faulty PCM.
  4. Turn ignition off. Disconnect PCM harness connector J3. Turn ignition on. If test light now illuminates, repair short to ground in KS circuit. If test light does not illuminate, replace PCM.
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