P1860
DTC P1860: Inhibitor Solenoid Circuit Low 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 P1860 recurs with the HDS.
Is DTC P1860 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 body ground.
Is there continuity?
YES - Repair short in the wire between PCM connector terminal B10 and solenoid harness connector terminal No. 5, then go to step 12.
NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck for DTC P1860. If the symptom/indication goes away with a known-good PCM, replace the original PCM, 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 P1860 recurs.
Is DTC P1860 indicated?
YES - Return to step 3 and recheck.
NO - Troubleshooting is complete.