Symptom Chart - Electronic Shift

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 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 4X4 control module	Scan tool Data Link Connector (DLC) 4X4 control module Circuitry	CHECK the module communications network. REFER to MODULE COMMUNICATIONS NETWORK .
The Instrument Cluster (IC) 4X4 and low range indicators do not operate correctly/do not operate	IC Circuitry 4X4 control module	GO to PINPOINT TEST G .
The 4X4 indicators flashes	Shift requirements are not met	MAKE SURE that the vehicle speed is below 8 km/h (5 mph) when shifting into 4X4 low. MAKE SURE that the transmission is in NEUTRAL (automatic transmission) or the clutch pedal is fully depressed (manual transmission). CHECK for spline block, gears are not synchronized. The vehicle may need to move for the gears to mesh. CHECK for excessive neutral drag torque (automatic transmission). REFER to DIAGNOSIS AND TESTING .
The transfer case does not shift between 2WD and 4X4 High modes correctly	Mode Select Switch (MSS) Transfer case Transfer case clutch Pulse Vacuum Hublock (PVH) 4X4 control module Circuitry	GO to PINPOINT TEST I .
The transfer case does not shift between 4X4 High and 4X4 Low modes correctly	Transfer case Mode select switch 4X4 control module Transmission drag	GO to PINPOINT TEST K .
Four-Wheel Drive (4WD) does not engage at speed correctly	Transfer case synchronizer 4X4 control module PVH	GO to PINPOINT TEST L .
The front axles do not engage/disengage correctly	PVH PVH solenoid assembly Circuitry Vacuum leaks 4X4 control module Front axle assembly	GO to PINPOINT TEST H .
The 4X4 system jumps out of gear	Transfer case PVH system Mode select switch	GO to PINPOINT TEST M .
Straightline driveline wind up	Tire inflation pressure Tire and wheel size Tire wear Axle ratio	GO to PINPOINT TEST N .
Clunking noise during 4WD engagement, especially at high speeds	Vehicle speed Torque to the front axle	GO to PINPOINT TEST L .
The transfer case makes noise	Tire inflation pressure Tire and wheel size	MAKE SURE that all tires and wheels are the same size and that the inflation pressures are correct.
	Tire tread wear	CHECK tire tread wear to see if there is more than 0.15 mm (0.06 in) difference in tread wear between front and rear. INTERCHANGE one front wheel and one rear wheel. ROAD TEST again.
	Internal components	OPERATE the vehicle in all transmission gears. If there is noise in the transmission in NEUTRAL, or in some gears and not in others, REMOVE and REPAIR the transmission. REFER to REMOVAL . If there is noise in all gears, DISASSEMBLE the transfer case. REFER to TRANSFER CASE . CHECK the planetary gears, the bearings, the upper and lower drive sprockets and drive chain for damage. INSTALL new parts as necessary.
	Fluid level	FILL with the specified fluid. REFER to TRANSMISSION FLUID DRAIN AND REFILL or TRANSFER CASE .
Unable to duplicate customer concern	4WD system and/or related components	CARRY OUT the Electronic Shift- On-The-Fly (ESOF) Functional Test. GO to PINPOINT TEST O .