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

DTC (PGM-FI)

1. 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.

2. 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.

   A/F sensor (Sensor 1) 6P connector

   PCM connector C (51P)

   -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)*

   Courtesy of HONDA, U.S.A., INC.

   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), then do the repair verification.

3. PCM output voltage check

   -1. Reconnect the following connector.

   PCM connector C (51P)

   -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

   Courtesy of HONDA, U.S.A., INC.

   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 , then do the repair verification.

   NO 

   Replace the A/F sensor (Sensor 1) , then do the repair verification.

4. Repair verification (OBD STATUS check)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   -4. Turn the vehicle to the ON mode.

   -5. Reset the PCM with the HDS .

   Reset PCM

   -6. Do the PCM idle learn procedure.

   -7. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   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)

   Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?

   PASSED (P0134)

   Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

   PASSED (P0154)

   Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

   FAILED (P0134)

   Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM , then check the OBD STATUS again.

   FAILED (P0154)

   Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM , then check the OBD STATUS again.

   NOT COMPLETED

   Keep idling until a result comes on.