B31 Check Circuit 777 (Y) For Open; B32 Check Circuit 778 (O) For Open; B33 Check The Ground To The Transfer Case Shift Relays — Circuit 57 (Bk) - Ford Expedition 1998 Workshop Manual

1998 Expedition/Navigator Workshop Manual

B31 CHECK CIRCUIT 777 (Y) FOR OPEN

B32 CHECK CIRCUIT 778 (O) FOR OPEN

B33 CHECK THE GROUND TO THE TRANSFER CASE SHIFT RELAYS — CIRCUIT 57 (BK)
Transfer Case Shift Relays C221
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWJ/~MUS~LEN/21/...
Are the resistances less than 5 ohms?
Yes
RECONNECT the transfer case assembly. GO to
No
GO to B33.
Measure the resistance between transfer case shift relays C221-7, circuit 777 (Y), and transfer case assembly
C201-15, circuit 777 (Y).
Is the resistance less than 5 ohms?
Yes
GO to B32.
No
REPAIR circuit 777 (Y). CLEAR the DTCs. TEST the system for normal operation.
Measure the resistance between transfer case shift relays C221-10, circuit 778 (O), and transfer case assembly
C201-14, circuit 778 (O).
Is the resistance less than 5 ohms?
Yes
REPLACE the transfer case shift relays. CLEAR the DTCs. TEST the system for normal operation.
No
REPAIR circuit 778 (O). CLEAR the DTCs. TEST the system for normal operation.
Measure the resistance between transfer case shift relays C221-1, circuit 57 (BK), and ground.
B34 .
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8/30/2010