P1861
DTC P1861: Inhibitor Solenoid Circuit High VoltageNOTE:
^ 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. Choose Inhibitor Solenoid Test in the Miscellaneous Test Menu, and check that DTC P1861 recurs with the HDS.
Is DTC P1861 indicated?
YES - Go to step 3.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the solenoid harness connector, PCM, and the inhibitor solenoid.
3. Turn the ignition switch OFF.
4. Disconnect the solenoid harness connector.
5. Measure resistance between solenoid harness connector terminal No. 5 and body ground.
Is there 11.7 - 21.0 ohms?
YES - Go to step 9.
NO - Go to step 6.
6. Remove the lower valve body.
7. Disconnect the inhibitor solenoid connector.
8. Measure resistance between inhibitor solenoid connector terminal No. 2 and body ground.
Is there 11.7 - 21.0 ohms?
YES - Replace the solenoid harness, then go to step 12.
NO - Replace the inhibitor solenoid, then go to step 12.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (44P).
11. Check for continuity between PCM connector terminal B10 and solenoid harness connector terminal No. 5.
Is there continuity?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck for DTC P1861. If the symptom/indication goes away with a known-good PCM, replace the original PCM, then go to step 12.
NO - Repair open in the wire between PCM connector terminal B10 and solenoid harness connector terminal No. 5, then go to step 12.
12. Clear the DTC with the HDS.
13. Choose Inhibitor Solenoid Test in Miscellaneous Test Menu, and check that DTC P1861 recurs.
Is DTC P1861 indicated?
YES - Return to step 3 and recheck.
NO - Troubleshooting is complete.