Does the GEM PID PLATE_A not indicate OPEN?
Yes
GO to
B34
.
No
GO to
B33
.
B33
CHECK CIRCUIT 771 (P/Y) TO THE CONTACT PLATE SWITCH A — MONITOR THE GEM PID PLATE_A
Connect a jumper wire between transfer case assembly C201-5, circuit 771 (P/Y), and C201-
10, circuit 762 (Y/W).
Monitor the GEM PID PLATE_A.
Does the GEM PID PLATE_A indicate CLOSED?
Yes
REMOVE the jumper wire; GO to
B39
.
No
GO to
B35
.
B34
CHECK CIRCUIT 771 (P/Y) FOR SHORT TO GROUND
Measure the resistance between GEM C241-21, circuit 771 (P/Y), 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 771 (P/Y). CLEAR the DTCs. CYCLE the ignition OFF then ON. TEST the
system for normal operation.
B35
CHECK CIRCUIT 771 (P/Y) FOR OPEN
GEM C241
Measure the resistance between transfer case assembly C201-5, circuit 771 (P/Y), and GEM
C241-21, circuit 771 (P/Y).
Page 43 of 74
1998 F-150/250 Workshop Manual
1/11/2011
http://www.fordtechservice.dealerconnection.com/pubs/con...
