DTC Troubleshooting: P0979 (22-3)
|DTC P0979:||Short in Shift Solenoid Valve C Circuit|
- 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.||Start the engine, and shift to the D position.|
|3.||Check that DTC P0979 recurs.|
Is DTC P0979 indicated?
YES - Go to 7.
NO - Go to 4.
|4.||Choose Shift Solenoid C in Miscellaneous Test Menu, and test the shift solenoid valve C with the HDS.|
|5.||Start the engine, and shift to the D position.|
|6.||Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0979.|
Did the result indicate a fail?
YES - Go to 7.
NO - Intermittent failure, the system is OK at this time. Check the GRN wire for an intermittent short to ground between the shift solenoid valve C and PCM. If the tester indicates NOT COMPLETE, return to 4 and recheck.n
|7.||Turn the ignition switch OFF.|
|8.||Jump the SCS line with the HDS.|
|9.||Disconnect PCM connectors A (31P) and C (22P).|
|10.||Measure the resistance between PCM connector terminals C2 and A8 or A9.|
Is there less than 12 W?
YES - Go to 11.
NO - 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.n
|11.||Disconnect the shift solenoid harness connector at the transmission housing.|
|12.||Check for continuity between PCM connector terminals C2 and A8 or A9.|
Is there continuity?
YES - Repair short to ground in the wire between PCM connector terminal C2 and the shift solenoid harness connector, then go to 13.
NO - Check shift solenoid valve C, and check for a short in the shift solenoid harness in the transmission. Replace shift solenoid valve C and/or shift solenoid harness, then go to 13.
|13.||Clear the DTC with the HDS.|
|14.||Start the engine, and shift to the D position.|
|15.||Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0979.|
Did the result indicate a pass?
YES - The problem has been corrected.n
NO - Return to 1 and recheck.n