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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P0036: Ho2S Heater Control Circuit (Sensor 2) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ON the ignition, with the engine OFF. Clear the DTCs with a scan tool. Observe the DTC information for 30 seconds with the scan tool. Are DTCs P0030, P0036, P1031 and/or P1032 set? If yes, see DTC P0030: HO2S HEATER CONTROL CIRCUIT (SENSOR 1) . If no, go to next step.
  3. Start the engine and bring to operating temperature. Clear the DTCs with a scan tool. Observe the DTC information for 30 seconds with a scan tool. Does DTC P0036 set? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn OFF the ignition. Disconnect the HO2S harness connector. Turn ON the ignition, with the engine OFF. With a test lamp connected to ground, probe the ignition supply voltage circuit at the HO2S harness connector. Does the test lamp illuminate? If yes, go to next step. If no, go to step  11.
  5. Leave the HO2S 2 disconnected. Start the engine. With a test lamp connected to battery voltage, probe the HO2S bank 1 sensor 2 heater low control circuit. Does the test lamp illuminate? If yes, go to next step. If no, go to step  7.
  6. Leave the test lamp connected between battery voltage and the HO2S bank 1 sensor 2 heater low control circuit. Turn OFF the ignition. Disconnect the PCM connectors. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? If yes, go to step  13. If no, go to step  15.
  7. Leave the test lamp connected between battery voltage and the HO2S bank 1 sensor 2 heater low control circuit. Turn ON the ignition, with the engine OFF. With a scan tool, command the HO2S heater driver 4 ON and OFF. Does the test lamp turn ON and OFF? If yes, go to step  12. If no, go to next step.
  8. Test the HO2S bank 1 sensor 2 heater low control circuit for an open. Did you find and correct the condition? If yes, go to step  16. If no, go to next step.
  9. Test the HO2S bank 1 sensor 2 heater low control circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  16. If no, go to next step.
  10. Test the HO2S bank 1 sensor 2 heater low control circuit for poor connections at the PCM. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  11. Repair the open in the ignition supply voltage circuit to the HO2S bank 1 sensor 2. After repairs, go to step  16.
  12. Test for poor connections at the HO2S bank 1 sensor 2 connector. Did you find and correct the condition? If yes, go to step  16. If no, go to step  14.
  13. Repair the short to ground in the HO2S bank 1 sensor 2 bank 1 sensor 2 heater low control circuit. After repairs, go to step  16.
  14. Replace HO2S bank 1 sensor 2. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  16.
  15. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  16. Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  17. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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