P0977
DTC P0977: Open in Shift Solenoid Valve B Circuit2004-2005 Model
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. Turn the ignition switch OFF.
2. Disconnect PCM connector A (31P).
3. Check for continuity between PCM connector terminal A23 and body ground, and between terminal A24 and body ground.
Is there continuity?
YES - Go to step 4.
NO - Repair open in the wire between PCM connector terminals A23, A24, and ground (G101), or repair poor ground (G101).
4. Disconnect PCM connectors A (31P) and C (22P).
5. Turn the ignition switch ON (II).
6. Measure the voltage between PCM connector terminals C4 and A23 or A24.
Is there voltage?
YES - Repair short to power in the wire between PCM connector terminal C4 and the shift solenoid valve B.
NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Measure the resistance between PCM connector terminals C4 and A23 or A24.
Is there 12 - 25 Ohms?
YES - Check for loose terminal fit, and repair if necessary. 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 9.
9. Disconnect shift solenoid valve A and B connector.
10. Measure the resistance between shift solenoid valve B connector terminal No. 2 and body ground.
Is there 12 - 25 Ohms?
YES - Repair open in the wire between PCM connector terminal C4 and shift solenoid valve B.
NO - Replace shift solenoid valve B.