Component Inspection
- Replace the HO2S.
- Clear DTC with scan tool.
- Start the engine and warm it up until the radiator fan comes on (more than at least 10 minutes).
- Drive at a steady speed between 45-55 mph(72-88 km/h) for 30 seconds.
- Stop and then maintain idle state for 30 seconds in D-position.
- Check if O2 sensor monitoring readiness is complete.
- Does the scan tool show DTC P0159?
YES
- Substitute with a known-good ECM and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Troubleshooting is finished.
NOTE: There is a memory reset function on scan tool that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function before reusing the ECM