Navigator 2WD V8-5.4L DOHC VIN R (2001)
Multiplex Communication Network: Testing and Inspection
Module Communications Network
Initial Inspection
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
^
Central Junction Box (CJB) fuse 3 (20 A)
^
Wiring harness
^
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:
^
check that the program card is correctly installed.
^
check the connections to the vehicle.
^
check the ignition switch position.
If the diagnostic tool still does not communicate with the vehicle, go to Pinpoint Test M. See: Pinpoint Tests/Pinpoint Tests/Test M: No
Module/Network Communication - No Power to Scan Tool
4. Go to Pinpoint Test PC. See: Pinpoint Tests/Pinpoint Test PC (Precheck)
