A11 Check The Voltage To The Hall Effect Sensors — Circuit 774 (Lg); A12 Check Circuit 774 (Lg) For Open - Ford Expedition 1998 Workshop Manual

1998 Expedition/Navigator Workshop Manual
A11 CHECK THE VOLTAGE TO THE HALL EFFECT SENSORS — CIRCUIT 774 (LG)
Transfer Case Assembly C201

A12 CHECK CIRCUIT 774 (LG) FOR OPEN

GEM C241
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWJ/~MUS~LEN/21/...
Monitor the PIDs TRA_RSP, TRA_FSP and VSS_GEM.
Drive the vehicle at 48 kph (30 mph) or greater.
Are the PIDs TRA_RSP and TRA_FSP within 3 kph (2 mph) of the VSS_GEM?
Yes
GO to A19.
No
If both PIDs TRA_RSP and TRA_FSP indicate 0 kph, GO to
If only one PID indicates 0 kph, GO to A14 .
If both PIDs indicate greater than 0 kph, but are not within 3 kph ( 2 mph) of each other, check for possible Hall
effect misalignment, or toothed wheel concern.
Measure the voltage between transfer case assembly C201-3, circuit 774 (LG), and ground; and between transfer
case assembly C201-7, circuit 774 (LG), and ground.
Are the voltages greater than 10 volts?
Yes
GO to A13.
No
GO to A12.
Measure the resistance between transfer case assembly C201-3, circuit 774 (LG), and GEM C241-1, circuit 774
(LG); and between transfer case assembly C201-7, circuit 774 (LG), and GEM C241-1, circuit 774 (LG)
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A11 .
8/30/2010