P2630

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

NOTE: 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 with no 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.

Are DTC P0107, P0112, P0117, P2122, P2127, P2228, P0452, P2627, and P2630 indicated at same time?

YES - Go to step 12.

NO - Go to step 5.

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

Is DTC P2627 and/Or P2630* indicated?

YES - Go to step 6.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and at the ECM/PCM.

6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect ECM/PCM connector B (24P).




9. Check for continuity between ECM/PCM connector terminal B10 (B19)* and body ground.

Is there continuity?

YES - Go to step 10.

NO - Go to step 29.

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




11. Check for continuity between ECM/PCM connector terminal B10 (B19)* and body ground.

Is there continuity?

YES - Repair short in the wire between the ECM/PCM (B10 (B19)*) and the A/F sensor (Sensor 1), then go to step 18.

NO - Go to step 21.

12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connectors A (31P) and D (17P).
15. Disconnect the connectors from these parts:

- MAP sensor
- Front/rear A/F sensor
- APP sensor
- IMRC actuator
- EGR sensor
- FTP sensor
- Input shaft (mainshaft) speed sensor
- Output shaft (countershaft) sensor




16. Check for continuity between body ground and ECM/PCM connector terminals A31, D2, D6, and D12 individually.

Is there continuity?

YES - Repair short in the wire between the ECM/PCM (A31, D2, D6, or D12) and each part, then go to step 22.

NO - Go to step 17.

17. Reconnect ECM/PCM connectors A (31P) and D (17P).
18. Turn the ignition switch ON (II).




19. Measure voltage between ECM/PCM connector terminal D6 and body ground.

Is there about 5 V?

YES - Go to step 20.

NO - Go to step 29.

20. Continue to monitor voltage at the ECM/PCM connector terminal D6 while reconnecting these parts, one at a time:

- MAP sensor
- Front/rear A/F sensor
- APP sensor
- IMRC actuator
- EGR sensor
- FTP sensor
- Input shaft (mainshaft) speed sensor
- Output shaft (countershaft) sensor

Did the voltage drop to about 0 V?

YES - Replace the part that caused the voltage to drop, then go to step 24.

NO - Go to step 29.

21. Replace the A/F sensor (Sensor 1).
22. Reconnect each part's connector.
23. Reconnect ECM/PCM connectors.
24. Turn the ignition switch ON (II).
25. Reset the ECM/PCM with the HDS.
26. Do the ECM/PCM idle learn procedure. Programming and Relearning
27. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P2627 and/or P2630* 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 any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 28.

28. Monitor the OBD STATUS for DTC P2627 and/or P2630* 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 26 and recheck.

29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
30. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P2627 and/or P2630* 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 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.