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Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure: Procedure

  1. Perform INSPECTION/MAINTENANCE SYSTEM CHECK  . After performing inspection/maintenance system check, go to next step.
    2. CAUTION: Road test vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
    NOTE: If the ignition is turned on, ignition voltage is supplied to HO2S heaters. After verifying enable criteria, turn ignition off for approximately 5 minutes to allow sensors to cool before continuing with test.
  2. Preprogram scan tool with vehicle information before ignition is turned on. Verify vehicle is within enable criteria. Set vehicle parking brake. Ensure transmission is in Park. Turn off all of accessories. Start the engine. Allow engine to idle for 2 minutes. Accelerate at part throttle to 45 MPH. Maintain this speed for 2 minutes or until I/M SYSTEM STATUS indicator updates to YES. Using scan tool, observe I/M SYSTEM STATUS display. If HO2S HEATER SYSTEM STATUS updated to YES, go to step  5 . If HO2S HEATER SYSTEM STATUS did not update to YES, go to next step.
  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not indicate any failed DTCs, go to next step.
  4. Using scan tool, observe NOT RAN SINCE CODE CLEARED display to determine if DTCs P0135, P0155, P0141, P0161, P1141 and P1161 have run. For those DTCs that have not run, see CODE ENABLE CRITERIA under appropriate DTC under DIAGNOSTIC TESTS. Operate vehicle to meet code enable criteria until DTC(s) runs. Using scan tool, observe I/M SYSTEM STATUS display. If EVAP SYSTEM STATUS updated to YES, go to next step. If EVAP SYSTEM STATUS did not update to YES, see DIAGNOSTIC AIDS  .
  5. Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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