DTC P0141
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. Enter the maintenance mode, then start the engine , and let it idle.
-4. 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
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the 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 .
- Fuse check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check the following fuse.
Fuse No. D21 Is the fuse OK?
YES
Go to step 3.
NO
Repair a short in the IG1_ACG/IG1 (MAIN) /IG1 (SO2) wire between the No. D21 fuse and the secondary HO2S (Sensor 2). Also replace the No. D21 fuse.
- Secondary HO2S (Sensor 2) internal heater resistance check
-1. Disconnect the following connector.
Secondary HO2S (Sensor 2) 4P connector -2. At the secondary HO2S (Sensor 2) 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 (sensor side) : Test point 2 Secondary HO2S (Sensor 2) 4P connector (female terminals) No. 4 (sensor 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, measure the resistance 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 (sensor side) and No. 4 (sensor side) : Test point 2 Body ground Is there 1 MΩ or more?
YES
Go to step 5.
NO
- 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. Measure the resistance 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 1 MΩ or more?
YES
The SO2HT wire is not shorted. Go to step 6.
NO
Repair a short in the SO2HT wire between the PCM (A4) and the secondary HO2S (Sensor 2).
- Open wire check (SO2HT line)
-1. Measure the resistance 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 1.0 Ω or less?
YES
The SO2HT wire is OK. Go to step 7.
NO
Repair an open in the SO2HT wire between the PCM (A4) and the secondary HO2S (Sensor 2).
- Open wire check (IG1_ACG/IG1 (MAIN) /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 (MAIN) /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 (MAIN) /IG1 (SO2) wire between the No. D21 fuse and the secondary HO2S (Sensor 2).