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 .
Replace the A/F sensor (Sensor 1). Reconnect all connectors. Turn the ignition switch ON (II). Reset the ECM/PCM with the HDS. Do the ECM/PCM idle learn procedure. 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. 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's troubleshooting.
NO | - | Go to Step 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 18 and recheck.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. 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. ■