Ford Expedition 2003 Workshop Manual page 10

2003 Expedition/Navigator Workshop Manual
Does the front driveshaft lock to the rear?
B15 CHECK THE ELECTRIC CLUTCH—NOT ENERGIZED
Connect the scan tool.
Trigger the electric clutch control output command
(CLUTCHSOL). Set the command to zero percent.
Rotate the front driveshaft.
Does the front driveshaft lock to the rear?
B16 CHECK THE VOLTAGE TO THE ELECTRIC CLUTCH—
ENERGIZED
Ignition OFF.
Disconnect: Transfer Case C350.
Ignition ON.
Trigger the electric clutch control output command
(CLUTCHSOL). Set the command to 100 percent.
Measure the voltage between transfer case C350 pin 8, circuit
779 (BN) and ground.
Is the voltage greater than 10 volts?
B17 CHECK THE VOLTAGE TO THE ELECTRIC CLUTCH—NOT
ENERGIZED
Ignition OFF.
Disconnect: Transfer Case C350.
Ignition ON.
Measure the voltage between transfer case C350 Pin 8, circuit
779 (BN) and ground.
Is the voltage zero volts?
B18 CHECK CIRCUIT 779 (BN) FOR SHORT TO VOLTAGE
Ignition OFF.
Disconnect: 4WD Control Module C3184a.
Ignition ON.
Measure the voltage between 4WD control module C3184a pin
17, circuit 779 (BN), harness side and ground.
Is any voltage present?
B19 CHECK CIRCUIT 779 (BN) FOR AN OPEN
Ignition OFF.
Measure the resistance between transfer case C350 pin 8,
circuit 779 (BN) and 4WD control module C3184a pin 17, circuit
779 (BN).
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3J/~MUS~LEN/20/S...
Yes
GO to B17.
No
GO to Section 206-09.
Yes
INSTALL a new electric clutch. REFER to
the system for normal operation.
No
GO to B19.
Yes
INSTALL a new electric clutch. REFER to
the system for normal operation.
No
GO to B18.
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
No
GO to B19.
Yes
GO to B20.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
Page 10 of 18
Section 308-07B. CLEAR the DTCs. TEST
Section 308-07B. CLEAR the DTCs. TEST
1/22/2010