4WD – Revised IWE Operation Strategy After Initial Start Up – 2019 Ford F-150 & Expedition & Lincoln Navigator

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NHTSA ID Number: 10163587

Manufacturer Communication Number: SSM 48088

Summary

2019 F-150/Expedition/Navigator vehicles equipped with four-wheel drive (4WD) have a revised transfer case control module (TCCM) strategy that will affect integrated wheel end (IWE) operation after initial start up. The TCCM will not energize the solenoid to supply vacuum to the IWEs after the initial key cycle and a driven gear is selected. The IWEs will remain engaged for 0.8 km (0.5 mi) when the temperature is above 0ยฐC (32ยฐF) and 3 km (2 mi) when below 0ยฐC (32ยฐF). The strategy changes were implemented to improve vacuum supply management and axle warm up in cold temperatures. The engine must run for a minimum of 5 minutes to build sufficient vacuum before performing any vacuum related testing. Refer to the Workshop Manual (WSM) Section, 307-08A – Four-Wheel Drive Systems – System Operation and Component Description for additional information.

 

3 Affected Products

Vehicles

FORDeBayEXPEDITION2019
FORDeBayF-1502019
LINCOLNeBayNAVIGATOR2019

 


SSM 48088

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