Torque Converter Clutch Solenoid Circuit

NAME OF CODE:
Torque Converter Clutch Solenoid CKT

WHEN MONITORED:
With the ignition key ON.

SET CONDITION:
An open or shorted condition is detected in the torque converter clutch solenoid relay control circuit.

THEORY OF OPERATION:
Three-speed trucks use a relay to control the torque converter clutch solenoid. The solenoid controls the operation of the converter clutch. A small current continuously senses the state of this circuit when the ignition key is turned ON.

POSSIBLE CAUSES:
- Solenoid/relay coil open or shorted
- Fused ignition switch output circuit open
- Solenoid/relay control circuit open or shorted to ground