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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 315 (ENGINE CONTROLS SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0327: KNOCK SENSOR CIRCUITCONDITIONS FOR RUNNING TEST
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Conditions For Running Test

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION 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.