( TF09EABK72100090135FAAT00 )
DTC Troubleshooting: P0135 (41)
DTC P0135:
 A/F Sensor (Sensor 1) Heater Circuit Malfunction
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0135 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), A/F sensor relay, and the ECM/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Check the No. 26 A/F SENSOR (10A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to Step 7 .
NO -
Go to Step 21 .
  1. Open the fuse lid (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
Is the A/F sensor relay OK?
YES -
Go to Step 9 .
NO -
Replace the A/F sensor relay, then go to Step 25 .
  1. Disconnect the A/F sensor (Sensor 1) 4P connector.
  1. At sensor side, measure the resistance between A/F sensor (Sensor 1) 4P connector terminals No. 3 and No. 4.
Is there 1.9−2.7 Ω at room temperature?
YES -
Go to Step 11 .
NO -
Go to Step 24 .
  1. At sensor side, check for continuity between A/F sensor (Sensor 1) 4P connector terminals No. 2 and No. 3, and between terminals No. 2 and No. 4 individually.
Is there continuity?
YES -
Go to Step 24 .
NO -
Go to Step 12 .
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector C (49P).
  1. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and ECM/PCM connector terminal C9.
Is there continuity?
YES -
Go to Step 15 .
NO -
Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to Step 25 .
  1. Open the fuse lid (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
  1. Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
  1. Check for continuity between A/F sensor relay 4P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Go to Step 18 .
NO -
Repair open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay, then go to Step 25 .
  1. Disconnect ECM/PCM connector A (49P).
  1. Connect ECM/PCM connector terminal A22 to body ground with a jumper wire.
  1. Check for continuity between A/F sensor relay 4P connector terminal No. 3 and body ground.
Is there continuity?
YES -
Go to Step 31 .
NO -
Repair open in the wire between the ECM/PCM (A22) and the A/F sensor relay, then go to Step 25 .
  1. Open the fuse lid (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
  1. Disconnect the A/F sensor (Sensor 1) 4P connector.
  1. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.
Is there continuity?
YES -
Repair short in the wire between the A/F sensor relay and the A/F sensor (Sensor 1). Also replace the No. 26 A/F SENSOR (10 A) fuse, then go to Step 25 .
NO -
Replace the under-dash fuse/relay box, then go to Step 25 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0135 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1), A/F sensor relay, and the ECM/PCM, then go to Step 1 .
NO -
Go to Step 30 .
  1. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 26 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), A/F sensor relay, and the ECM/PCM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 28 .
  1. Reconnect all connectors.
  1. Start the engine.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0135 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1), A/F sensor relay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 33 . If the ECM/PCM was substituted, go to Step 1 .
NO -
Go to Step 35 .
  1. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs were indicated in Step 34 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 30 . If the ECM/PCM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.