Theory Of Operation
WARNING: This page is about a different car, the 2024 Jeep Grand Cherokee L. However, it is still accessible from the selected car via links, so may be relevant.
The Transmission Control Module (TCM) measures the actual solenoid voltages and compares them to calibrated values to identify the following electrical failures:
- Short to battery
- Open circuit
- Short to ground
When the solenoid is switched on (i.e. commanded control value is 100%), the diagnostic can not distinguish between short to ground and open circuit. In that case, the Application-Specific Integrated Circuit (ASIC) status information is used to detect the failure.