P0135
DTC P0135: A/F Sensor (Sensor 1) Heater Circuit MalfunctionNOTE:
- Information marked with an asterisk (*) applies to D17A6 engine (2001-2003 models).
- Information marked with double asterisks (**) applies to 2004-2005 models.
1. Reset the ECM/PCM.
2. Start the engine.
Is DTC P1166* (P0135)** indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
3. Measure voltage between ECM/PCM connector terminals A1 and A24, 30 seconds after the ignition switch is turned ON (II).
Is there battery voltage?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
NO - Go to step 4.
4. Measure voltage between ECM/PCM connector terminals A22 and A24.
Is there battery voltage?
YES - Go to step 5.
NO - Go to step 9.
5. Turn the ignition switch ON (II).
6. Disconnect ECM/PCM connector A (31 P).
7. Turn the ignition switch ON (II).
8. Connect ECM/PCM connector terminal E8 to body ground with a jumper wire, then measure voltage between ECM/PCM connector terminals A1 and A24.
Is there battery voltage?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
NO - Repair open or short in the wire between A/F sensor (Sensor 1) and the ECM/PCM (A1).
9. Turn the ignition switch OFF.
10. Disconnect ECM/PCM connector A (31 P) and the A/F sensor (Sensor 1) 4P connector.
11. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No.3 and body ground.
Is there continuity?
YES - Repair short in the wire between the A/F sensor relay, the A/F sensor (Sensor 1), and the ECM/PCM (A22).
NO - Go to step 12.
12. Turn the ignition switch ON (II).
13. Measure voltage between ECM/PCM connector terminals E8 and A24.
Is there battery voltage?
YES - Repair open in the wire between the ECM/PCM (A22) and the A/F sensor (Sensor 1) or A/F sensor relay.
NO - Go to step 14.
14. Check these fuses:
- No.14 OPTION (40 A) fuse in under-hood fusel relay box.
- No. 4 ACG (10 A) fuse in under-dash fuse/relay box.
- No.2 A/F HEATER (20 A) in under-dash fuse/relay box.
Are any of the fuses blown?
YES - Repair short in the wire between the A/F sensor relay and the fuses.
NO - Go to step 15.
15. Check for continuity in the wires between the A/F sensor relay and the fuses.
Is there continuity?
YES - The wires are OK, replace the A/F sensor relay.
NO - Repair open in the wire between the A/F sensor relay and the fuses.