DTC P0134, P0154
DTC P0134 : Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction DTC P0154 : Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction
NOTE:
- Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the A/T System (2014 2015) .
- If DTC P2251 and/or P2254 * is stored at the same time as DTC P0134 and/or P0154 *, troubleshoot DTC P2251 and/or P2254 * first, then recheck for P0134 and/or P0154 *.
- Information marked with an asterisk (*) applies to the front bank (Bank 2).
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P0134 Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction | |||
| P0154 Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Start the engine, and let it idle without load (in P or N) for at least 1 minute.
- 4. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0134 Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction P0154 Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction Is DTC P0134 and/or P0154* 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 A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.
- Open wire check (VSB1 (VSB2) * line):
- 1.Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS.
- 3. Disconnect the following connectors.
- 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector C (51P): disconnected A/F sensor (Sensor 1) 6P connector: disconnected Test circuit VSB1 (VSB2) * Test point 1 Rear A/F sensor (Bank 1, Sensor 1) 6P connector No. 6 (LT GRN) Front A/F sensor (Bank 2, Sensor 1) 6P connector No. 6 (WHT) * Test point 2 PCM connector C (51P) No. 25 (LT GRN) PCM connector C (51P) No. 28 (WHT) * Is there continuity?
YES
The VSB1 (VSB2)* wire is OK. Go to step 3.
NO
Repair an open in the VSB1 (VSB2) * wire between the PCM (C25 (C28) *) and the A/F sensor (Sensor 1).
- PCM output voltage check
-1. Reconnect the following connector.
- 2. Exit the SCS mode with the HDS.
- 3. Start the engine, and let it idle without load (in P or N) for at least 1 minute.
- 4. Measure the voltage between test point 1 and 2.
Test condition Running PCM connector C (51P): connected A/F sensor (Sensor 1) 6P connector: disconnected Test circuit VSB1 (VSB2) * Test point 1 Rear A/F sensor (Bank 1, Sensor 1) 6P connector No. 6 (LT GRN) Front A/F sensor (Bank 2, Sensor 1) 6P connector No. 6 (WHT) * Test point 2 Body ground Is there about 0.2 V or less?
YES
Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016), or PCM Removal and Installation (2014 2015) .
NO