Ford Expedition 2003 Workshop Manual page 12
Four wheel drive (4wd) systems
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Also See for Expedition 2003:
- Quick reference manual (2 pages) ,
- Owner's manual (346 pages)
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2003 Expedition/Navigator Workshop Manual
Is the resistance less than 5 ohms?
B25 CHECK IWE SOLENOID
Carry out the IWE solenoid component test.
Refer to Wiring Diagrams Cell
Did the IWE solenoid pass the component tests?
B26 CHECK FOR CORRECT 4WD CONTROL MODULE
OPERATION
Disconnect all 4WD control module connectors.
Check for:
corrosion
pushed-out pins
Connect all 4WD control module connectors and make sure they
seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?
PINPOINT TEST C: NO COMMUNICATION WITH THE FOUR-WHEEL DRIVE (4WD) CONTROL MODULE
C1 CHECK POWER TO 4WD CONTROL MODULE
Ignition OFF.
Disconnect: 4WD Control Module C3184b.
Ignition ON.
Measure the voltage between 4WD control module and ground. Refer to the following chart:
4WD Control Module Pin
C3184b pin 8
C3184b pin 17
704 (DG/LG)
Are all of the voltage measurements greater than 10 volts?
C2 CHECK 4WD CONTROL MODULE GROUND CIRCUITS
Ignition OFF.
Disconnect: 4WD Control Module C3184a.
Disconnect: 4WD Control Module C3184b.
Measure the resistance between 4WD control module C3184a, pin 1, circuit 57 (BK), harness
side and ground; and between 4WD control module C3184b, pin 2, circuit 875 (BK/LB), harness
side and ground.
Are both resistance less than 5 ohms?
C3 CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION
Disconnect all 4WD control module connectors (C3184a and C3184b), and the transfer case
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3J/~MUS~LEN/20/S...
Yes
GO to B26.
149
for component testing.
No
INSTALL a new IWE solenoid. CLEAR the DTCs. TEST the system for normal
operation.
Yes
INSTALL a new 4WD control module. CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. Concern may have been caused by a
loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
Test Step
Circuit
1524 (DB)
Result / Action to Take
Yes
GO to C2.
No
REPAIR the circuit(s) in question. TEST the system for
normal operation.
Yes
GO to C3.
No
REPAIR the circuit. TEST the system for normal
operation.
Yes
Page 12 of 18
1/22/2010
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