A27 Check The A4Wd Output; A28 Check Circuit 779 (Br) For Open - Ford Expedition 1998 Workshop Manual

1998 Expedition/Navigator Workshop Manual

A27 CHECK THE A4WD OUTPUT

Transfer Case Assembly C201

A28 CHECK CIRCUIT 779 (BR) FOR OPEN

A4WD Clutch Relay C293
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Is any voltage indicated?
Yes
REPAIR circuit 976 (O). CLEAR the DTCs. TEST the system for normal operation.
No
REPLACE the A4WD clutch relay. CLEAR the DTCs. TEST the system for normal operation.
NOTE: The CLCH SOL active command is located in the Shift Clutch Control active command menu.
Set the active command CLCH SOL to ENERGIZED.
Measure the voltage between transfer case assembly C201-16, circuit 779 (BR), and ground.
Is the voltage less than 5 volts when the active command is set to 0% and greater than 10 volts when
set to 100%?
Yes
REPAIR the transfer case clutch; REFER to Section
operation.
No
GO to A28.
Measure the resistance between A4WD clutch relay C293-B, circuit 779 (BR), and transfer case assembly C201-
16, circuit 779 (BR).
Is resistance less than 5 ohms?
Yes
GO to A29.
No
REPAIR circuit 779 (BR). CLEAR the DTCs. TEST the system for normal operation.
308-07B. CLEAR the DTCs. TEST the system for normal
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8/30/2010