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 without load (in Park or neutral) until the radiator fan comes on.
3. Test-drive under these 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 - Go to step 14.
14. Turn the ignition switch OFF.
15. Disconnect ECM/PCM connector E (31 P)
16. Connect third HO2S (Sensor 3) 4P connector terminals No.1 to body ground with a jumper wire.
17. Check for continuity between ECM/PCM connector terminal E4 and body ground.
Is there continuity?
YES - Repair open in the wire between the ECM/PCM (E2) and the third HO2S (Sensor 3).
NO - Repair open in the wire between the ECM/PCM (E4) and the third HO2S(Sensor 3).