DTC P0052: Left Front Ho2S Heater Circuit High: Testing
NOTE:
Record freeze frame data. Check for service bulletins and on-line information.
- Turn ignition off. Disconnect left front HO2S. Check connectors for damaged terminals and corrosion. If problem is not present, go to next step. If problem is present, repair as necessary and go to step 5 .
- Measure resistance between left front HO2S connector terminals "A" and "B". See WIRING DIAGRAMS article. If resistance is 5.0-6.8 ohms, go to next step. If resistance is not 5.0-6.8 ohms, replace left front HO2S and go to step 5 .
- Turn ignition off. Disconnect PCM harness connector. PCM is mounted to passenger floor, behind glove box. Check PCM harness connector and PCM terminal No. 94 for damaged terminals and corrosion. See Figure . If problem is not present, go to next step. If problem is present, repair as necessary and go to step 5 .
- Turn ignition on. Measure voltage in Orange wire between ground and left front HO2S harness connector terminal "B". If battery voltage is not present, go to next step. If battery voltage is present, repair short to power in Orange wire between ground left front HO2S harness connector terminal "B" and PCM harness connector terminal No. 94. Go to next step.
- Reconnect all components. Using scan tool, clear DTC. Start engine and allow to reach operating temperature. Check for DTC P0052. If DTC P0052 is not pending, go to next step. If DTC P0052 is pending, replace PCM and go to next step.
- Perform after repair procedure. See AFTER REPAIR PROCEDURE . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.