P0144
DTC P0144: Third HO2S (Sensor 3) Circuit High Voltage1. Reset the ECM/PCM.
2. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on.
3. Test-drive under following conditions.
- 55 - 65 mph (89 - 105 km/h) steady speed
- CVT in D position (M/T in 4th or 5th gear)
- Until the readiness code or Temporary DTC P0144 and/or P0144 is set
4. Check for a Temporary DTC with the HDS or a scan tool.
Is Temporary DTC P0144 and/or P0144 indicated?
YES - Go to step 5.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the third HO2S (Sensor 3) and the at ECM/PCM.
5. Turn the ignition switch OFF.
6. Disconnect the third HO2S (Sensor 3) 4P connector.
7. Connect third HO2S (Sensor 3) 4P connector terminals No. 1 and No. 2 with a jumper wire.
8. Turn the ignition switch ON (II).
9. Check the third HO2S (Sensor 3) output voltage with the HDS or a scan tool.
Is there 1.0 V or more?
YES - Go to step 10.
NO - Replace the secondary HO2S (Sensor 2) and the third HO2S (Sensor 3).
10. Turn the ignition switch OFF.
11. Connect ECM/PCM connector terminals E2 and E4 with a jumper wire.
12. Turn the ignition switch ON (II).
13. Check the third HO2S (Sensor 3) output voltage with the HDS or a scan tool.
Is there 1.0 V or more?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
NO - Repair open in the wire between the ECM/PCM (E2, E4) and the third HO2S (Sensor 3).