D17 Check Circuit 605 (R) For Open; D18 Check Circuit 145 (Gy/Bk) For Short To Ground; D19 Check Circuit 605 (R) For Short To Ground; D20 Check The Vacuum At The 4Wd And 2Wd Vacuum Solenoids - Ford Expedition 1998 Workshop Manual

1998 Expedition/Navigator Workshop Manual

D17 CHECK CIRCUIT 605 (R) FOR OPEN

D18 CHECK CIRCUIT 145 (GY/BK) FOR SHORT TO GROUND

D19 CHECK CIRCUIT 605 (R) FOR SHORT TO GROUND

D20 CHECK THE VACUUM AT THE 4WD AND 2WD VACUUM SOLENOIDS

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Is the resistance less than 5 ohms?
Yes
GO to D17.
No
REPAIR circuit 145 (GY/BK). CLEAR the DTCs. TEST the system for normal operation.
Measure the resistance between GEM C241-7, circuit 605 (R), and 4WD vacuum solenoid C180, circuit 605 (R).
Is the resistance less than 5 ohms?
Yes
GO to D18.
No
REPAIR circuit 605 (R). CLEAR the DTCs. TEST the system for normal operation.
Measure the resistance between GEM C241-2, circuit 145 (GY/BK), and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to D19.
No
REPAIR circuit 145 (GY/BK). CLEAR the DTCs. TEST the system for normal operation.
Measure the resistance between GEM C241-7, circuit 605 (R), 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 605 (R). CLEAR the DTCs. TEST the system for normal operation.
Connect a vacuum gauge to the 4WD and 2WD vacuum solenoid feed lines.
Is approximately 20 in-Hg (64 kPa) of vacuum present?
Yes
GO to D21.
No
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8/30/2010