1998 Expedition/Navigator Workshop Manual
C26 CHECK CIRCUIT 771 (P/Y) TO THE CONTACT PLATE SWITCH A
C27 CHECK CIRCUIT 771 (P/Y) FOR SHORT TO GROUND
GEM C241
C28 CHECK CIRCUIT 771 (P/Y) FOR OPEN
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWJ/~MUS~LEN/21/...
Does the PID PLATE_A not indicate OPEN?
Yes
GO to C27.
No
GO to C26.
Connect a jumper wire between transfer case assembly C201-10, circuit 762 (Y/W), and C201-5, circuit 771
(P/Y).
Monitor the PID PLATE_A.
Does the PID PLATE_A indicate CLOSED?
Yes
GO to C32.
No
GO to C28.
Measure the resistance between transfer case assembly C201-5, 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 to OFF, then ON. TEST the system for normal
operation.
Measure the resistance between transfer case assembly C201-5, circuit 771 (P/Y), and GEM C241-21, circuit 771
(P/Y).
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8/30/2010