Ford Expedition 2003 Workshop Manual page 11

2003 Expedition/Navigator Workshop Manual
Is the resistance less than 5 ohms?
B20 CHECK THE THROTTLE POSITION INPUT—MONITOR THE
4WD PID TPI
Ignition ON.
Monitor the PID: TPI while pressing and releasing the
accelerator pedal.
Does the PID: TPI increase when the accelerator pedal is
pressed and decrease when the accelerator pedal is
released?
B21 CHECK CIRCUIT 1498 (PK/OG) FOR A SHORT TO VOLTAGE
Ignition ON.
Measure the voltage between 4WD control module C3184b pin
14, circuit 1498 (PK/OG), harness side and ground.
Is any voltage indicated?
B22 CHECK CIRCUIT 474 (OG/LG) FOR OPEN
Disconnect: IWE Solenoid C1157.
Measure the voltage between IWE solenoid C1157 pin 1, circuit
474 (OG/LG) and ground.
Is the voltage greater than 10 volts?
B23 CHECK CIRCUIT 605 (RD) FOR SHORT TO GROUND
Measure the resistance between IWE solenoid C1157 pin 2,
circuit 605 (RD) and ground.
Is the resistance greater than 10,000 ohms?
B24 CHECK CIRCUIT 605 (RD) FOR OPEN
Disconnect: 4WD Control Module C3184b.
Measure the resistance between IWE solenoid C1157 pin 2,
circuit 605 (RD) and 4WD control module C3184b pin 12, circuit
605 (RD).
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3J/~MUS~LEN/20/S...
Yes
DISCONNECT 4WD control module connector C3184b and the PCM connector
C1752. INSPECT circuit 1498 (PK/OG) for signs of corrosion or damage. If OK,
RECONNECT the connectors making sure they seat correctly. CLEAR the DTCs.
TEST the system for normal operation.
No
GO to B21.
Yes
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
No
REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual for diagnosis and
testing of the PCM.
Yes
GO to B23.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
Yes
GO to B24.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
Yes
GO to B25.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
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1/22/2010