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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 155 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 3.5L)DIAGNOSTIC TESTSDTC P0036: HO2S HEATER CONTROL CIRCUIT (SENSOR 2)TEST DESCRIPTION
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Test Description

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Test Description
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step number in the diagnostic procedures.

  1. 4

    This step ensures that the ignition 1 voltage circuit to HO2S is not open or shorted. The test light should be connected to a good chassis ground, in case the HO2S low reference or HO2S heater low control circuit is malfunctioning.

  2. 5

    This step checks the HO2S heater low control circuit. The engine must be running for PCM to enable the heater.

  3. 6

    This step checks for a short to ground in HO2S heater low control circuit.

  4. 7

    This step checks for a short to voltage on HO2S heater low control circuit.
RENDER: 1.0x

NO RELATED

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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.