SULEV Ex Model

DTC P0141: Malfunction in Secondary HO2S (Sensor 2) Heater circuit
1. Do the PCM Reset Procedure.
2. Start the engine.
Is DTC P0141 indicated?
YES-Go to step 3.
NO- Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C204 (located under the right side of the dash), C101, C102 (located at the left side of the engine compartment), the Secondary HO2S (Sensor 2) and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the Secondary HO2S (Sensor 2) 4P connector.




5. At the Secondary HO2S side, measure resistance between the Secondary HO2S 4P connector terminals No.3 and No.4.
Is there 2.0 - 20.0 Ohm?
YES-Go to step 6.
NO-Replace the Secondary HO2S (Sensor 2).




6. Check for continuity between body ground and the Secondary HO2S 4P connector terminals No.3 and No.4 individually.
Is there continuity?
YES-Replace the Secondary HO2S (Sensor 2).
NO-Go to step 7.
7. Start the engine.




8. Measure voltage between the Secondary HO2S 4P connector terminal No.4 and body ground.
Is there battery voltage?
YES-Go to step 9.
NO-Repair open in the wire between the No.6 ECU (PCM) CRUISE CONTROL (15 A) fuse and the Secondary HO2S.
9. Turn the ignition switch OFF.




10. Check for continuity between the Secondary HO2S 4P connector terminal No.3 and body ground.
IS there continuity?
YES-Go to step 11.
NO-Go to step 13.
11. Disconnect the ECM/PCM connector A (32P).




12. Check for continuity between the Secondary HO2S 4P connector terminal No.3 and body ground.
Is there continuity?
YES-Repair short in the wire between the PCM (A8) and Secondary HO2S (Sensor 2).
NO-Substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM.
13. Reconnect the Secondary HO2S (Sensor 2) 4P connector.
14. Disconnect the PCM connector A (32P).
15. Turn the ignition switch ON (II).




16. Measure voltage between the PCM connector terminal A8 and body ground.
Is there battery voltage?
YES-Substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM.
NO-Repair open in the wire between the PCM (A8) and Secondary HO2S (Sensor 2).