Note. If DTC P0139 is stored at the same time as DTC P0133, troubleshoot DTC P0139 first, then recheck for DTC P0133. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
- Test-drive under these conditions: ECT SENSOR above 158°F (70°C) A/T in D position (M/T in 5th gear) Vehicle speed between 25 mph (41 km/h) and 55 mph (88 km/h) for 5 minutes, then maintain a steady speed between 30 mph (49 km/h) and 75 mph (120 km/h).
- Monitor the OBD STATUS for DTC P0133 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES- Go to step 6 . NO- If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
- Turn the ignition switch OFF.
- Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(ref-220570-S42298875192006022000000) ).
- Turn the ignition switch ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-220572-S08440202922006022000000) ).
- Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
- Test-drive under these conditions: ECT SENSOR above 158°F (70°C) A/T in D position (M/T in 5th gear) Vehicle speed between 25 mph (41 km/h) and 55 mph (88 km/h) for 5 minutes, then maintain a steady speed between 30 mph (49 km/h) and 75 mph (120 km/h).
- Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES- If DTC P0133 is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO- Go to step 14 .
- Monitor the OBD STATUS for DTC P0133 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES- Troubleshooting is complete. NO- If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 10 and recheck.