DTC Troubleshooting

DTC P2627: Rear A/F Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage

DTC P2630: Front A/F Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- Information marked with an asterisk (*) applies to the front bank (Bank 2).

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle for 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2627 and/or P2630* indicated?

YES - Go to step 5.

NO - Intermittent failure, the 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 ECM/PCM connector D (17P).




8. Check for continuity between ECM/PCM connector terminal B11 (D10)* and body ground.

Is there continuity?

YES - Go to step 9.

NO - Go to step 17.

9. Disconnect the A/F sensor (Sensor 1) 8P connector.




10. Check for continuity between ECM/PCM connector terminal D11 (D10)* and body ground.

Is there continuity?

YES - Repair short in the wire between the ECM/PCM (D11 (D10)*) and the A/F sensor (Sensor 1), then go to step 12.

NO - Go to step 11.

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.

Is DTC P2627 and/or P2630* indicated?

YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

17. Reconnect all connectors.
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.

Is DTC P2627 and/or P2630* indicated?

YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.