Yes
GO to
A51
.
No
GO to
A50
.
A50
CHECK THE CIRCUIT 770 (W) TO THE CONTACT PLATE SWITCH B — MONITOR THE GEM PID PLATE_B
Connect a jumper wire between transfer case assembly C201-10, circuit 762 (Y/W), and
C201-1, circuit 770 (W).
Monitor the GEM PID PLATE_B.
Does the GEM PID PLATE_B indicate CLOSED?
Yes
REMOVE the jumper wire; GO to
A54
.
No
GO to
A52
.
A51
CHECK CIRCUIT 770 (W) FOR SHORT TO GROUND
GEM C241
Measure the resistance between transfer case assembly C201-1, circuit 770 (W), and ground.
Is the resistance greater than 10,000 ohms?
Yes
REPLACE the GEM; REFER to
Section 419-10
. CLEAR the DTCs. TEST the system for
normal operation.
No
REPAIR circuit 770 (W). CLEAR the DTCs. CYCLE the ignition OFF then ON. TEST the
system for normal operation.
A52
CHECK CIRCUIT 770 (W) FOR OPEN
Measure the resistance between transfer case assembly C201-1, circuit 770 (W), and GEM
C241-20, circuit 770 (W).
Page 25 of 74
1998 F-150/250 Workshop Manual
1/11/2011
http://www.fordtechservice.dealerconnection.com/pubs/con...
