P0977

DTC P0977: Open in Shift Solenoid Valve B Circuit

NOTE:
^ Record all freeze data and review General Troubleshooting Information before you troubleshoot.
^ 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. Test-drive the vehicle for several minutes in the D position in all five gears.
3. Check that DTC P0977 recurs.
Is DTC P0977 indicated?
YES-Go to step 7.
NO-Go to step 4.
4. Choose Shift Solenoid B in Miscellaneous Test Menu, and test the shift solenoid valve B with the HDS.
Is the system normal?
YES-Go to step 5.
NO-Go to step 7.
5. Test-drive the vehicle for several minutes in the D position in all five gears.
6. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate a fail?
YES-Go to step 7.
NO-Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at shift solenoid valve B and PCM. If the tester indicates NOT COMPLETE, return to step 4 and recheck.
7. Turn the ignition switch OFF.
8. Jump the SCS line with HDS.
9. Disconnect PCM connectors B (44P) and C (44P).





10. Measure the resistance between PCM connector terminals C23 and C40 or B43.
Is there 12 - 25 Ohms?
YES-Check for loose or poor connections at PCM connector terminal C23. If the connection is OK, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
NO-Go to step 11.
11. Disconnect shift solenoid valve B connector.





12. Measure shift solenoid valve B resistance at the solenoid valve connector.
Is there 12 - 25 Ohms?
YES-Go to step 13.
NO-Replace shift solenoid valve B, then go to step 14.





13. Check for continuity between shift solenoid valve B connector terminal No. 1 and body ground.
Is there continuity?
YES-Repair open in the wire between PCM connector terminal C23 and shift solenoid valve B, then go to step 14.
NO-Repair open in the wire between shift solenoid valve B and ground (G151), or repair poor ground (G151), then go to step 14.
14. Clear the DTC with the HDS.
15. Test-drive the vehicle for several minutes in the D position in all five gears.
16. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate a pass?
YES-The problem has been corrected.
NO-Return to step 1 and recheck.