Normal Operation
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
When the Mode Select Switch (MSS) is engaged to lock the rear differential, a Pulse Width Modulated (PWM) signal is sent to the Electronic Locking Differential (ELD) field coil by the Transfer Case Control Module (TCCM) through the differential lock control circuit. This signal is a PWM signal which is initially 98% duty cycle to lock the differential and decreases to 40% duty cycle once the differential is locked. If the differential lock control circuit is open or shorted to ground, the TCCM senses a signal is not reaching the differential and sets a DTC.
- DTC P1833:00 (Transfer Case Differential Lock-up Solenoid Open Circuit: No Sub Type Information) - The TCCM sends a signal to the differential to lock the differential. The TCCM senses that the differential lock control circuit is open.
- DTC P1835:00 (Transfer Case Differential Lock-up Solenoid Short Circuit To Ground: No Sub Type Information) - The TCCM sends a signal to lock the differential. The TCCM senses that the differential lock control circuit is shorted to ground.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TCCM