Electronic Locking Differential (ELD) System

Electronic Locking Differential (ELD) System

Principles of Operation

Electronic Locking Differential (ELD) System

The ELD (Electronic Locking Differential) system allows the operator to lock the rear differential side gears. When the ELD (Electronic Locking Differential) is engaged both rear wheels turn at the same speed, providing added traction on slippery and/or off road surfaces. The operator can engage the ELD (Electronic Locking Differential) per the charts below:

ELD (Electronic Locking Differential) Engagement Speeds - 4WD (Four-Wheel Drive) Vehicles





a The ELD (Electronic Locking Differential) system engages/re-engages at or below the speed noted.

ELD (Electronic Locking Differential) Engagement Speeds - 2WD (2-Wheel Drive) Vehicles





a The ELD (Electronic Locking Differential) system engages/re-engages at or below the speed noted.

When the operator activates the ELD (Electronic Locking Differential), the ELD (Electronic Locking Differential) icon displays in the IPC (Instrument Panel Cluster) message center. If the vehicle is driven above the disengage speed, the IPC (Instrument Panel Cluster) message center no longer displays the ELD (Electronic Locking Differential) icon, alerting the operator that the ELD (Electronic Locking Differential) is disengaged. Once the vehicle drops below the re-engage speed, the IPC (Instrument Panel Cluster) message center displays the ELD (Electronic Locking Differential) icon again. If there is a malfunction with the ELD (Electronic Locking Differential) system, a "CHECK LOCKING DIFFERENTIAL" message is displayed in the IPC (Instrument Panel Cluster) message center, letting the operator know the ELD (Electronic Locking Differential) is not engaged.

The differential locks when a PWM (Pulse Width Modulated) controlled magnetic field coil located inside the differential energizes. A collar within the differential moves toward a differential side gear and engages a dog clutch within the differential. This locks the differential side gears and creates the locked differential.

The TCCM (Transfer Case Control Module) activates the ELD (Electronic Locking Differential). When the ELD (Electronic Locking Differential) is engaged, the TCCM (Transfer Case Control Module) sends PWM (Pulse Width Modulated) voltage to the ELD (Electronic Locking Differential) field coil located in the differential. This voltage is initially 98% duty cycle, and then tapers off to 40% duty cycle after 30 seconds. In order for the TCCM (Transfer Case Control Module) to activate the ELD (Electronic Locking Differential), certain conditions must be met.

TCCM (Transfer Case Control Module) Input Conditions

- MSS (Mode Select Switch) set to ELD (Electronic Locking Differential) position

- Average rear wheel speed versus average front wheel speed must be less than 7 km/h (4.3 mph) (via HS-CAN (High Speed Controller Area Network) communication from ABS module)

- Operating range (voltage between 9-16 volts)

- DTC setting range (voltage between 10-15 volts)

- Ignition in the ON position

- Throttle Position (TP) less than 50%