F 150 Heritage 4WD Pickup V8-5.4L CNG VIN M (2004)
Information Bus: Testing and Inspection
Communications Network
Initial Inspection
INSPECTION AND VERIFICATION
1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
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Central junction box (CJB) fuse 3 (20A)
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Wiring harness
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Connections
3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC), located beneath the instrument panel, and
select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
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check that the program card is correctly installed and the correct version is used.
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check the connections to the vehicle.
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check the ignition switch position.
If the diagnostic tool still does not communicate with the vehicle, go to Pinpoint Test J. See: Pinpoint Tests/Pinpoint Tests/Test J
4. Go to Pinpoint Test PC. See: Pinpoint Tests/Pinpoint Test PC (Precheck)
Test PC
Test A
PINPOINT TEST A: THE 4-WHEEL ANTI-LOCK BRAKE (4WABS) CONTROL MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL
