DTC P0141 (1.5 L Engine)
DTC P0141 : Secondary HO2S (Sensor 2) Heater Circuit Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information .
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0141 Secondary HO2S (Sensor 2) Heater Circuit Malfunction |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Turn the vehicle to the OFF (LOCK) mode.
-4. Start the engine, and let it idle.
-5. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0141 Secondary HO2S (Sensor 2) Heater Circuit Malfunction Is DTC P0141 indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .
- Shorted wire check (IG1 ACG/IG1 (ACG)/IG1 (SO2) line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check the following fuse.
Fuse No. D21 (10 A) Location Under-dash fuse/relay box Is the fuse OK?
YES
Go to step 3.
NO
Repair a short in the IG1 ACG/IG1 (ACG)/IG1 (SO2) wire between secondary HO2S (Sensor 2) and the No. D21 (10 A) fuse. Also replace the No. D21 (10 A) fuse.
- Secondary HO2S (Sensor 2) internal heater resistance check
-1. Disconnect the following connector.
Secondary HO2S (Sensor 2) 4P connector -2. At the sensor side, measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Secondary HO2S (Sensor 2) 4P connector: disconnected Test point 1 Secondary HO2S (Sensor 2) 4P connector (female terminals) No. 3 (secondary HO2S (Sensor 2) side): Test point 2 Secondary HO2S (Sensor 2) 4P connector (female terminals) No. 4 (secondary HO2S (Sensor 2) side): Is there 4.2-6.6 Ω at room temperature?
YES
Go to step 4.
NO
- Secondary HO2S (Sensor 2) internal circuit check
-1. At the sensor side, check for continuity between test point 1 and 2.
Test condition Vehicle OFF (LOCK) mode Secondary HO2S (Sensor 2) 4P connector: disconnected Test point 1 Secondary HO2S (Sensor 2) 4P connector (female terminals) No. 3 and No. 4 (secondary HO2S (Sensor 2) side): Test point 2 Body ground Is there continuity?
YES
Replace the secondary HO2S (Sensor 2) .
NO
Go to step 5.
- Shorted wire check (SO2HT line)
-1. Jump the SCS line with the HDS, and wait more than 1 minute.
-2. Disconnect the following connector.
PCM connector A (50P) -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Secondary HO2S (Sensor 2) 4P connector: disconnected PCM connector A (50P): disconnected Test point 1 PCM connector A (50P) No. 4 Test point 2 Body ground Is there continuity?
YES
Repair a short in the SO2HT wire between the PCM (A4) and secondary HO2S (Sensor 2).
NO
Go to step 6.
- Open wire check (SO2HT line)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Secondary HO2S (Sensor 2) 4P connector: disconnected PCM connector A (50P): disconnected Test point 1 Secondary HO2S (Sensor 2) 4P connector (male terminals) No. 3: Test point 2 PCM connector A (50P) No. 4 Is there continuity?
YES
Go to step 7.
NO
Repair an open in the SO2HT wire between the PCM (A4) and secondary HO2S (Sensor 2).
- Open wire check (IG1 ACG/IG1 (ACG)/IG1 (SO2) line)
-1. Turn the vehicle to the ON mode.
-2. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Secondary HO2S (Sensor 2) 4P connector: disconnected PCM connector A (50P): disconnected Test point 1 Secondary HO2S (Sensor 2) 4P connector (male terminals) No. 4: Test point 2 Body ground Is there battery voltage?
YES
The IG1 ACG/IG1 (ACG)/IG1 (SO2) wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .
NO
Repair an open in the IG1 ACG/IG1 (ACG)/IG1 (SO2) wire between secondary HO2S (Sensor 2) and the No. D21 (10 A) fuse in the under-dash fuse/relay box.