P1157
DTC P1157: A/F Sensor (Sensor 1) AFS Line High Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Is DTC P1157 indicated?
YES - Go to step 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.
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 A (31P).
9. Connect A/F sensor (Sensor 1) 4P connector terminals No.1 and No.2 with a jumper wire.
10. Check for continuity between ECM/PCM connector terminals A28 and A31.
Is there continuity?
YES - Go to step 14.
NO - Go to step 11.
11. Remove the jumper wire from the A/F sensor (Sensor 1) 4P connector.
12. Connect A/F sensor (Sensor 1) 4P connector terminal No.2 to body ground with a jumper wire.
13. Check for continuity between ECM/PCM connector terminal A31 and body ground.
Is there continuity?
YES - Repair open in the wire between the ECM/PCM (A28) and the A/F sensor (Sensor 1), then go to step 15.
NO - Repair open in the wire between the ECM/PCM (A31) and the A/F sensor (Sensor 1), then go to step 15.
14. Replace the A/F sensor (Sensor 1).
15. Reconnect ECM/PCM connector A (31P).
16. Turn the ignition switch ON (II).
17. Reset the ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure.
19. Check for Temporary DTCs or DTCs in the DTC MENU 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 step 1. If the connector and terminal fits are OK, go to step 21. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Go to step 20.
20. Monitor the OBD STATUS for DTC P1157 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
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 step 1. If the screen indicates NOT COMPLETED, go to step 19 and recheck.
21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
22. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Is DTC P1157 indicated?
YES - Go to step 20 and recheck.
NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.