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

Perform INSPECTION/MAINTENANCE SYSTEM CHECK . After performing inspection/maintenance system check, go to next step.

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.

Preprogram scan tool with vehicle information before ignition is turned on. Verify vehicle is operating within Conditions for Running. Set vehicle parking brake. Ensure transmission is in Park. Turn off all of accessories. Start the engine. Allow engine to idle 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.
Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, see DIAGNOSTIC TROUBLE CODE INDEX table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If scan tool does not indicate any failed DTCs, go to next step.
Using scan tool, observe NOT RAN SINCE CODE CLEARED display to determine if DTCs P0135 and P0141 have run. For those DTCs that have not run, see Conditions for Running DTC in 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 HO2S HEATER SYSTEM STATUS updated to YES, go to next step. If HO2S HEATER SYSTEM STATUS did not update to YES, see DIAGNOSTIC AIDS .
Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, see DIAGNOSTIC TROUBLE CODE INDEX table under DIAGNOSTIC TROUBLE CODE DEFINITIONS.