Normal Operation
WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
When the MSS is engaged to lock the rear differential, a PWM signal is sent to the ELD field coil by the TCCM through the differential lock control circuit. This PWM signal is initially 98% duty cycle to lock the differential and decreases to 40% duty cycle once the differential is locked. When the differential is fully locked, the indicator will illuminate steady.
- DTC P185C:00 (Differential Lock-Up Indicator Circuit High: No Sub Type Information) - When the driver engages the ELD the TCCM C2371A-20 senses the indicator circuit has high voltage and is not illuminated.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TCCM