Front Axle - M210: Notes

DESCRIPTION 

Tru-Lock is an electronically locking differential. The differential has four pinion gears, three pinion shafts and two side gears. On the back side of one side gear is half of the dog clutch.

OPERATION 

Pressing a two-way momentary rocker switch on the switch bank request axle lock. The first press DOWN requests rear axle to be locked, every other press DOWN toggles between "front and rear axle lock" and "rear axle lock" request states. Press rocker switch UP requests both axles to be unlocked. The switch is on the IP in the switch bank. The switch bank sends a message to the Instrument Panel Cluster (IPC). The IPC handles the switch debounce and switch diagnostics. Any one message sent by the IPC on the network is a valid switch change. The IPC passes the information via a Controller Area Network-Internal High Speed (CAN-IHS) message. There are three telltales on the cluster, "Rear", "Front", and "Lock". The telltales will be off if the axles are unlocked, flashing if there is a pending request to lock but the axles are not yet locked (transition to lock, torque-locked, or conditions not correct), and flashing rapidly if there is a fault. The "Front" and "Rear" telltales will match the front and rear differential states. The "Lock" telltale will be on solid if either the "Front" or "Rear" telltale is on or blinking. For more information on locker operation. Refer to MODULE, DRIVETRAIN CONTROL (DTCM), DESCRIPTION AND OPERATION .