A24
CHECK THE TRANSFER CASE SHIFT RELAYS COIL ACTIVATION — MONITOR THE GEM PIDS MTR_CCW AND MTR_CW
Monitor the GEM PIDs MTR_CCW and MTR_CW while triggering the GEM active command
CW/CCW ON.
Do the GEM PIDs MTR_CCW and MTR_CW indicate ON---?
Yes
GO to
A25
.
No
If the GEM PID displays ON-B-, GO to
A30
.
A25
CHECK THE TRANSFER CASE SHIFT RELAYS COIL DE-ACTIVATION — MONITOR THE GEM PIDS MTR_CCW AND MTR_CW
Monitor the GEM PIDS MTR_CCW and MTR_CW while triggering the GEM active command
CW/CCW OFF.
Do the GEM PIDs MTR_CCW and MTR_CW indicate OFF---?
Yes
GO to
A33
.
No
If the GEM PID displays OFFO-G, GO to
A26
.
A26
CHECK THE VOLTAGE TO THE TRANSFER CASE SHIFT RELAYS COILS — CIRCUIT 704 (DG/LG)
Transfer Case Shift Relays C221
Measure the voltage between transfer case shift relays connector C221-5, circuit 704
(DG/LG), and ground.
Is the voltage greater than 10 volts?
Yes
GO to
A27
.
No
REPAIR circuit 704 (DG/LG). CLEAR the DTCs. TEST the system for normal operation.
A27
CHECK CIRCUIT 781 (O/LB) FOR OPEN
GEM C241
Measure the resistance between transfer case shift relays C221-9, circuit 781 (O/LB), and
GEM C241-17, circuit 781 (O/LB).
Page 15 of 74
1998 F-150/250 Workshop Manual
1/11/2011
http://www.fordtechservice.dealerconnection.com/pubs/con...
