DTC Troubleshooting: P2238 (48)

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

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2238 indicated?


YES - Go to 4.


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.n


4.Turn the ignition switch OFF.

5.Jump the SCS line with the HDS.

6.Disconnect the A/F sensor (Sensor 1) 4P connector.

7.Disconnect ECM/PCM connector A (31P).

8.Check for continuity between ECM/PCM connector terminal A31 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM (A31) and the A/F sensor (Sensor 1), then go to 11.


NO - Go to 9.

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

10.Reconnect all connectors.

11.Turn the ignition switch ON (II).

12.Reset the ECM/PCM with the HDS.

13.Do the ECM/PCM idle learn procedure.

14.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2238 is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to 1. If the connector and terminal fits are OK, go to 16. If any other Temporary DTCs are or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Go to 15.


15.Monitor the OBD STATUS for DTC P2238 in the DTCs MENU with the HDS.

Does the screen indicated PASSED?


YES - Troubleshooting is complete.n


NO - If it is FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to 1. If it is NOT COMPLETED, go to 13 and recheck.

16.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

17.Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2238 indicated?


YES - Go to 1 and recheck.


NO - If the ECM/PCM was updated, troubleshooting was completed. If the ECM/PCM was substituted, replace the original ECM/PCM.n