P2238

DTC P2238: A/F Sensor (Sensor 1) AFS + Terminal Low Voltage**

NOTE:
- Information marked with an asterisk (*) applies to '02-03 models.
- Information marked with double asterisks (**) applies to '04 models.

1. Reset the ECM/PCM.
2. Start the engine,

Is DTC P1159* (P2238)** 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 at the ECM/PCM.

3. Turn the ignition switch OFF.
4. Disconnect the A/F sensor (Sensor 1) 4P connector and ECM/PCM connector A (31P).




5. Check for continuity between ECM/PCM connector terminal A6 and body ground.

Is there continuity?

YES - Repair short in the wire between the A/F sensor (Sensor 1) and the ECM/PCM (A6).

NO - Go to step 6.

6. Substitute a known-good A/F sensor (Sensor 1) and recheck.

Is DTC P1159* (P2238)** indicated?

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 - Replace the A/F sensor (Sensor 1).