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 .
- 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 |
|---|---|---|
| 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 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 power distribution module (PGM-FI subrelay circuit), 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 .
- Open wire check (VSB1 (VSB2) * line):-1.
Turn the vehicle to the OFF (LOCK) mode.
-2. Jump the SCS line with the HDS, and wait more than 1 minute.
-3. Disconnect the following connectors.
A/F sensor (Sensor 1) 6P connector PCM connector E (80P) -4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector E (80P): disconnected A/F sensor (Sensor 1) 6P connector: disconnected Test point 1 Rear A/F sensor (Bank 1, Sensor 1) 6P connector (female terminals) No. 6: Front A/F sensor (Bank 2, Sensor 1) 6P connector(female terminals) No. 6*: Test point 2 PCM connector E (80P) No. 45 PCM connector E (80P) No. 42 * 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 (E45 (E42) *) and the A/F sensor (Sensor 1).
- PCM output voltage check
-1. Reconnect the following connector.
PCM connector E (80P) -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 Engine running A/F sensor (Sensor 1) 6P connector: disconnected Test point 1 Rear A/F sensor (Bank 1, Sensor 1) 6P connector (female terminals) No. 6: Front A/F sensor (Bank 2, Sensor 1) 6P connector(female terminals) No. 6*: Test point 2 Body ground Is there about 0.2 V or less?
YES
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P0134 and/or P0154 * goes away and the PCM was substituted, replace the original PCM .
NO