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Automatic Transmission

DTC P2770: Open in Torque Converter Clutch Solenoid Valve Circuit

NOTE:
^ Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.
^ This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

1. Clear the DTC with the HDS.
2. Start the engine in P, and warm it up to normal operating temperature (the radiator fan comes on). Test-drive the vehicle at a constant speed of 37 mph (60 km/h) in D, in 5th gear for at least 1 second.
3. Check that DTC P2770 recurs.

Is DTC P2770 indicated?

YES - Go to step 7.

NO - Go to step 4.

4. Select LOCKUP SOLENOID TEST in MISCELLANEOUS TEST MENU, and test TORQUE CONVERTER CLUTCH SOLENOID VALVE with the HDS.

Does the screen indicated NORMAL?

YES - Go to step 5.

NO - Go to step 7.

5. Start the engine in P, and warm it up to normal operating temperature (the radiator fan comes on). Test-drive the vehicle at a constant speed of 37 mph (60 km/h) in D, in 5th gear for at least 1 second.
6. Monitor the OBD STATUS for P2770 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the torque converter clutch solenoid valve, the shift solenoid harness connector, and the PCM.

NO - If the screen indicates FAILED, go to step 7. If the screen indicates NOT COMPLETED, return to step 4 and recheck.

7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connectors B (44P) and C (44P).
10. Measure the resistance between PCM connector terminals B44 and B43 or C40.





Is there 12-25 ohms?

YES - Go to step 21.

NO - Go to step 11.

11. Disconnect the shift solenoid harness connector.
12. Check for continuity between PCM connector terminal B44 and shift solenoid harness connector terminal No. 3.





Is there continuity?

YES - Go to step 13.

NO - Repair an open in the wire between PCM connector terminal B44 and the shift solenoid harness connector, then go to step 15.

13. Remove the shift solenoid harness connector.
14. Check for continuity between shift solenoid harness connector terminal No. 3 and the torque converter clutch solenoid valve connector terminal.





Is there continuity?

YES - Replace torque converter clutch solenoid valve, then go to step 15.

NO - Replace the shift solenoid harness, then go to step 15.

15. Reconnect all connectors.

16. Turn the ignition switch to ON (II).
17. Clear the DTC with the HDS.
18. Start the engine in P, and warm it up to normal operating temperature (the radiator fan comes on). Test-drive the vehicle at a constant speed of 37 mph (60 km/h) in D, in 5th gear for at least 1 second.
19. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2770 indicated?

YES - Check for poor connections or loose terminals at the torque converter clutch solenoid valve, the shift solenoid harness, and the PCM, then go to step 1.

NO - If Temporary DTC or DTC P2770 is not indicated, or if any other Temporary DTCs are indicated, go to step 20.

20. Monitor the OBD STATUS for P2770 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTC or DTCs were indicated on step 19, go to the indicated DTCs troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the torque converter clutch solenoid valve, the shift solenoid harness, and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 18.

21. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
22. Start the engine in P, and warm it up to normal operating temperature (the radiator fan comes on). Test-drive the vehicle at a constant speed of 37 mph (60 km/h) in D, in 5th gear for at least 1 second.
23. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2770 indicated?

YES - Check for poor connections or loose terminals at the torque converter clutch solenoid valve, the shift solenoid harness, and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1.

NO - If Temporary DTC or DTC P2770 is not indicated, or if any other Temporary DTCs or DTCs are indicated, go to step 24.

24. Monitor the OBD STATUS for P2770 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs were indicated on step 23, go to the indicated DTCs troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the torque converter clutch solenoid valve, the shift solenoid harness, and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 22.