Symptom Chart - Electronic Shift

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART - ELECTRONIC SHIFT

Condition	Possible Sources	Action
No communication with the 4WD control module	4WD control module. Central junction box (CJB). CJB fuse 34 (10A), 45 (10A), 33 (10A). Circuitry.	Go To PINPOINT TEST D .
The vehicle does not shift between 2WD and 4X4 correctly	CJB fuse 59 (30A), 27 (15A). Mode select switch (MSS). Transfer case shift relays. Contact plate A, B, C, or D. Gearmotor encoder assembly. Circuitry. 4WD control module. Transfer case mechanism.	Go To PINPOINT TEST E .
The vehicle does not shift between 4X4 and 4X4 LOW modes correctly	CJB fuse 59 (30A). MSS. Park/neutral position switch. Brake pedal position (BPP) switch. 4WD control module. Transfer case. Digital transmission range (TR) sensor. Anti-lock brake control (ABS) module. Circuitry.	Go To PINPOINT TEST F .
The front axle is not engaging or disengaging correctly	CJB fuse 27 (15A). Pulse vacuum hublock (PVH) solenoid. 4WD control module. Circuitry. Vacuum lines. Hublocks. Hub and bearing.	Go To PINPOINT TEST G .
The 4X4 indicator is always on-four wheel drive system operates correctly	ABS module. Circuitry. Instrument cluster. 4WD control module.	Go To PINPOINT TEST H .
The 4X4 LOW indicator is always on	PCM. Circuitry. Instrument cluster. 4WD control module.	Go To PINPOINT TEST I .