Code 82

This DTC flashes the CHECK TRANS indicator and sets the BACKUP MODE.

CIRCUIT DESCRIPTION:
The shift solenoids are simple ON/OFF solenoids located in the main case valve body. The solenoids are normally closed or open-type. Depending on gear the Transmission Control Module (TCM) controls the solenoids to open or close a fluid inlet port. When the port is open, fluid pressure actuates the shift valve.
- The solenoid is activated by a current. This current is produced by applying a voltage to one side (the High side) and a ground to the other side (Low side).
- The High Side Driver (HSD) is a circuit of the TCM that acts as a switch between the solenoids and the supply voltage. The High side of the solenoid is permanently supplied with voltage, except in BACKUP MODE or when Ignition is OFF the High Side Driver is turned OFF.
- The Low Side Driver (LSD) is a circuit of the TCM that acts as a switch between the solenoid and ground. When the solenoid is commanded ON the TCM is switching the solenoid to ground.
The TCM continually monitors each solenoid connection to its Low Side Driver and to its High Side Driver for either low or high voltage.
- DTC82 is activated when the Shift High Side Driver or one of the Shift Low Side Drivers senses a short circuit or open circuit when the engine is cranked, then when the car is driven. DTC82 can be set only when the TCM is activating the solenoids in with the problem circuit.
- To know where the fault comes from, do IGNITION CYCLE to use the TCM self-check of solenoids when Engine is not cranked but Ignition ON.

DIAGNOSTIC AIDS:
- This diagnostic is an electrical test done by the TCM.
- Detection conditions:
- HSD or LSD is improperly ON.
- The condition needs to be present for at least 0.15 second.
- Action after the detection time: BACKUP MODE
- Recovery conditions: To recover, do after IGNITION CYCLE.