B6 Monitor The Mode Switch Pid 4Wdsgem; B7 Check The Mode Switch; B8 Check Circuit 780 (Db) For Open - Ford Expedition 1998 Workshop Manual

1998 Expedition/Navigator Workshop Manual

B6 MONITOR THE MODE SWITCH PID 4WDSGEM

B7 CHECK THE MODE SWITCH

Mode Switch C230

B8 CHECK CIRCUIT 780 (DB) FOR OPEN

GEM C241
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Monitor the PID 4WDSGEM.
Rotate the mode switch through the 2H, A4WD, 4H, and 4L positions.
Does the PID 4WDSGEM agree with the A4WD switch positions?
Yes
GO to B13.
No
GO to B7.
Rotate the mode switch to the 2H, A4WD, 4H, and 4L positions.
Measure the resistance between mode switch terminals 2 and 3 while rotating the mode switch through all switch
positions; refer to the following chart.
Switch Position Resistance Range
2H 3705-4095 ohms
A4WD 1425-1575 ohms
4H 646-714 ohms
4L 228-252 ohms
Are the resistances within specification?
Yes
GO to B8.
No
REPLACE the mode switch. CLEAR the DTCs. TEST the system for normal operation.
Measure the resistance between mode switch C230-3, circuit 780 (DB), and GEM C241-8, circuit 780 (DB).
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8/30/2010