DTC Troubleshooting: P0134
DTC P0134: A/F Sensor (Sensor 1) Heater System Malfunction
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If DTC P2251 is stored at the same time as DTC P0134, troubleshoot DTC P2251 first, then recheck for P0134.

DTC Description
Confirmed DTC
Pending DTC
P0134 A/F Sensor (Sensor 1) Heater System Malfunction
    

1.
Problem verification:

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 (CVT in P or N, M/T in neutral) for at least 1 minute.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0134 A/F Sensor (Sensor 1) Heater System Malfunction
    

Is DTC P0134 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 relay circuit board, 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.?
2.
Open wire check (VS line):

Open wire check (VS 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
A/F sensor (Sensor 1) 6P connector (female terminals) No. 6:
Test point 2
PCM connector E (80P) No. 73


Is there continuity?

     
YES
     
     
     
The VS wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the VS wire between the PCM (E73) and the A/F sensor (Sensor 1).?
3.
PCM internal circuit check:

PCM internal circuit 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 (CVT in P or N, M/T in neutral) 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
A/F sensor (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 goes away and the PCM was substituted, replace the original PCM.?
     
NO