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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0327: Knock Sensor Circuit - Low Input >> Diagnostic Procedures

Diagnostic Procedures

NOTE: If DTC P0325 is also set, diagnose DTC P0325 first. See DTC P0325: KNOCK SENSOR SYSTEM  .
  1. Turn ignition off for 10 seconds. Start and accelerate engine to 3500 RPM for 10 seconds. Using scan tool, monitor DTC P0327. If this DTC is active, go to next step. If this DTC is not active, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Turn engine off. Disconnect KS harness connector. Turn ignition on, with engine off. Using a DVOM, check voltage between ground and on both KS harness connector terminals. If voltage is not present in either circuit, go to next step. If voltage is present on either circuits, repair short to voltage in affected circuit.
  3. Turn ignition off. Disconnect PCM harness connector J1. Check continuity between ground and KS harness connector terminals "A" (Dark Blue wire) and "B" (Light Blue wire). Check continuity between KS harness connector terminals "A" (Dark Blue wire) and "B" (Light Blue wire). If continuity exists on any of the circuit, repair short to ground or to each other in affected circuit. If continuity does not exist on any of the circuit, go to next step.
  4. Connect a Noid Light (SA9194E) or a jumper wire to KS harness connector terminals. Check continuity at PCM harness connector J1 circuits No. 496 (Dark Blue wire) and No. 1876 (Light Blue wire). If continuity exists, check for terminals tightness at KS or PCM harness connectors. Repair as necessary. If continuity does not exist, repair open in circuits No. 496 (Dark Blue wire) or No. 1876 (Light Blue wire).
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