4X4 Mode Switch C225
GEM C221
Measure the resistance between mode switch C225-2, circuit 359 (GY/R), and GEM C221-21, circuit 359 (GY/R).
Is the resistance less than 5 ohms?
Yes
GO to A15.
No
REPAIR circuit 359 (GY/R). CLEAR the DTCs. TEST the system for normal operation.
A15 CHECK CIRCUIT 359 (GY/R) FOR SHORT TO POWER
Measure the voltage between mode switch C225-2, circuit 359 (GY/R), and ground.
Is any voltage indicated?
Yes
REPAIR circuit 359 (GY/R). CLEAR the DTCs. TEST the system for normal operation.
No
REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. TEST the system for normal operation.
A16 CHECK THE FRONT DRIVESHAFT ENGAGEMENT
Engage 4X4 HIGH and drive a short distance.
Raise and support the vehicle; refer to Section 100-02.
NOTE: The front and rear driveshafts should both spin.
Observe the front and rear driveshafts.
Does the transfer case lock the front driveshaft to the rear driveshaft?
Yes
GO to A17.
No
GO to A41.
If 4WD engagement is prolonged, harsh or noisy, GO to A18 .
A17 CHECK THE FRONT DRIVESHAFT DISENGAGEMENT
2000 Ranger Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYL/~MUS~LEN/21/