DTC Troubleshooting: P1157 (48) (R18A: M/T)

DTC Troubleshooting: P1157 (48)

DTC P1157:  A/F Sensor (Sensor 1) Line High Voltage


NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Start the engine, and wait 1 minute.

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

Is DTC P1157 indicated?


YES - Go to 5.


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


5.Turn the ignition switch OFF.

6.Jump the SCS line with the HDS.

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

8.Disconnect ECM/PCM connector C (44P).

9.Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 2 and ECM/PCM connector terminal C29.

 

Is there continuity?


YES - Go to 10.


NO - Repair open in the wire between the ECM/PCM (C29) and the A/F sensor (Sensor 1), then go to 12.

10.Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 1 and ECM/PCM connector terminal C30.

 

Is there continuity?


YES - Go to 11.


NO - Repair open in the wire between the ECM/PCM (C30) and the A/F sensor (Sensor 1), then go to 12.

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

12.Reconnect all connectors.

13.Turn the ignition switch ON (II).

14.Reset the ECM/PCM with the HDS.

15.Do the ECM/PCM idle learn procedure.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1157 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 step18. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Go to 17.


17.Monitor the OBD STATUS for DTC P1157 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?


YES - Troubleshooting is complete.n


NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to 1. If the screen indicates NOT COMPLETED, go to 15 and recheck.

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

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1157 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 any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


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