A16 Check Circuit 435 (Y/Lb)/722 (Lb) For Open; A17 Check Circuit 435 (Y/Lb)/772 (Lb) For Short To Ground; A18 Check Circuit 435 (Y/Lb)/772 (Lb) For Short To Power - Ford Expedition 1998 Workshop Manual
Transfer case
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Also See for Expedition 1998:
- Owner's manual (217 pages) ,
- Workshop manual (25 pages) ,
- Owner's manual (216 pages)
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1998 Expedition/Navigator Workshop Manual
GEM C239
A16 CHECK CIRCUIT 435 (Y/LB)/722 (LB) FOR OPEN
GEM C241
A17 CHECK CIRCUIT 435 (Y/LB)/772 (LB) FOR SHORT TO GROUND
A18 CHECK CIRCUIT 435 (Y/LB)/772 (LB) FOR SHORT TO POWER
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWJ/~MUS~LEN/21/...
If the rear Hall effect sensor is not indicating properly, measure the resistance between transfer case assembly
C201-6, circuit 682 (DB), and GEM C239-21, circuit 682 (DB). If the front Hall effect sensor is not indicating
properly, measure the resistance between transfer case assembly C201-8, circuit 682 (DB), and GEM C239-21,
circuit 682 (DB).
Are the resistances less than 5 ohms?
Yes
GO to A16.
No
REPAIR circuit 682 (DB). CLEAR the DTCs. TEST the system for normal operation.
If the rear Hall effect sensor is not indicating properly, measure the resistance between transfer case assembly
C201-2, circuit 722 (LB), and GEM C241-5, circuit 722 (LB). If front Hall effect sensor is not indicating properly,
measure the voltage between transfer case assembly C201-4, circuit 435 (Y/LB) and GEM C241-6, circuit 435
(Y/LB).
Are the resistances less than 5 ohms?
Yes
GO to A17.
No
REPAIR circuit 722 (LB)/435 (Y/LB). CLEAR the DTCs. TEST the system for normal operation.
If the rear Hall effect sensor is not indicating properly, measure the resistance between transfer case assembly
C201-2, circuit 772 (LB), and ground. If the front Hall effect sensor is not indicating properly, measure the
resistance between transfer case assembly C201-4, circuit 435 (Y/LB), and ground.
Are the resistances greater than 10,000 ohms?
Yes
GO to A18.
No
REPAIR circuit 435 (Y/LB)/772 (LB). CLEAR the DTCs. TEST the system for normal operation.
If the rear Hall effect sensor is not indicating properly, measure the voltage between transfer case assembly
Page 12 of 64
8/30/2010
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