Measure voltage between ECM/PCM connector terminals A5 and E21. Is there 0.1 V or less?
YES | - | Repair open in the wire between the ECM/PCM (E21) and the secondary HO2S (Sensor 2), then go to Step 25 .
NO | - | Go to Step 30 .
Turn the ignition switch OFF. Replace the secondary HO2S (Sensor 2). 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 DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P0141 is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Go to Step 30 .
Monitor the OBD STATUS for DTC P0141 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 secondary HO2S (Sensor 2) and the ECM/PCM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 28 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. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P0141 is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM /PCM, then go to Step 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. ■