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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 380 (ENGINE CONTROLS SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0327: KNOCK SENSOR CIRCUITCONDITIONS FOR RUNNING TEST
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Conditions For Running Test

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions For Running Test
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  • DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0336, P0341, P0502, P0503, P1114, P1115, P1121, P1122 or P1336 are not set.
  • The engine speed is between 1000-5000 RPM.
  • The engine has been running for a minimum of 30 seconds.
  • The throttle angle is more than 15 percent.
  • The engine load is more than 45 percent.
  • The ECT sensor parameter is more than 140°F (60°C).
  • The maximum spark retard is less than 15 degrees.
  • The ignition voltage is more than 9 volts.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.