D8 Check The Front Driveshaft Disengagement; D9 Check The Front Axle Disengagement; D10 Check 4Wd And 2Wd Vacuum Solenoid Circuits; D11 Check 4Wd And 2Wd Vacuum Hub Solenoids - Ford Expedition 1998 Workshop Manual

1998 Expedition/Navigator Workshop Manual

D8 CHECK THE FRONT DRIVESHAFT DISENGAGEMENT

D9 CHECK THE FRONT AXLE DISENGAGEMENT

D10 CHECK 4WD AND 2WD VACUUM SOLENOID CIRCUITS

D11 CHECK 4WD AND 2WD VACUUM HUB SOLENOIDS

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The front and rear driveshaft should both spin.
Is the transfer case locking the front driveshaft to the rear driveshaft?
Yes
GO to D8.
No
GO to Pinpoint Test B.
Place the mode switch in the 2H position.
NOTE: When 4WD is disengaged, the front driveshaft may spin due to viscous drag in the transfer case,
especially if cold. If this occurs, the front driveline can easily be stopped.
Verify only the rear driveshaft spins.
Does only the rear driveshaft spin?
Yes
GO to D9.
No
GO to Pinpoint Test B.
NOTE: The active commands AXLE ENGG and AXLE DSCN are located in the 4-Wheel Electronic Shift active
command menu.
Set the active command AXLE ENGG to OFF and the AXLE DSCN to ON.
Spin one front tire. The other front tire should not spin.
Is the axle disconnect working properly?
Yes
The 4WD system is OK.
No
GO to D10.
Monitor the PIDs 4WDSOL and 2WDSOL.
NOTE: The active commands AXLE ENGG and AXLE DSCN are located in the 4-Wheel Electronic Shift active
command menu.
Set the active command AXLE ENGG to ON and the AXLE DSCN to OFF.
Does the PID 4WDSOL indicate ON--- and 2WDSOL indicate OFF---?
Yes
GO to D11.
No
If the PID 2WDSOL indicates OFFO-G, GO to
Monitor the PIDs 4WDSOL and 2WDSOL.
NOTE: The active commands AXLE ENGG and AXLE DSCN are located in the 4-Wheel Electronic Shift active
command menu.
Set the active commands AXLE ENGG to OFF and AXLE DSCN to ON.
D14 . If the PID 4WDSOL indicates ON-B-, GO to
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D12 .
8/30/2010