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Home >> Saturn >> 2002 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0327: Knock Sensor Circuit - Low Input >> Diagnostic Procedure

Diagnostic Procedure

NOTE: If DTC P0324 or P0325 is also set, diagnose DTC P0324 or P0325 first. See DTC P0324 OR 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 status of DTC P0327 LAST TEST. If LAST TEST failed, go to next step. If LAST TEST did not fail, 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 both KS harness connector terminals. If voltage is less than 1.5 volts on each circuit, go to step  3 . If voltage is 1.5-3.5 volts on each circuit, go to step  4 . If voltage is greater than 3.5 volts on each circuit, repair affected circuit shorted to voltage.
  3. Turn ignition off. Disconnect PCM connector J1. Check continuity between circuit with low voltage and ground. If continuity exists, repair short to ground in affected circuit. If continuity does not exist, check PCM connector. If connector is okay, replace PCM.
  4. Turn ignition off for 10 seconds. Measure resistance between terminals at knock sensor connector. If resistance is less than 10 ohms, repair short between circuits (Dark Blue wire and Light Blue wire). If resistance is not less than 10 ohms, check knock sensor connector. If connector is okay, replace knock sensor.
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