Blue Bird Coachworks 450 LXi, Руководство пользователя

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5-2 Engine Messenger System
450 LXi Owner Manual
~ 5-2-46 ~ Rev. “C”
5-2.17 Diagnostic Test
Table 39
“Test” “Result” “Action”
“Check Electrical Connectors and Wiring”
Follow the wiring harness for the display and locate the connector from the display
to the vehicle.
Inspect the wiring harness for evidence of wear through the harness bundle.
Check the harness connector. Ensure that the connector is properly locked.
Pull on each of the wires in the connector. Refer to Troubleshooting “ Electrical
Connectors-Inspect ” for additional information.
“OK” “Proceed to next step.”
“Not OK”
Repair the problem. If
conditions are not resolved
then proceed to next step.
“Check Battery Voltage at Vehicle Connector”
Turn the ignition key OFF and disconnect the dash display connector.
Turn the ignition key ON and measure the DC voltage.
Use a voltmeter in order to measure the DC voltage from pin 3 (red wire from
display) to pin 4 (black wire from display) of the vehicle connector. The battery
voltage should be 11 to 13.5 Volts DC.
Pull on each of the wires in the connector.
Inspect batteries, wiring, and connectors.
“OK” “Proceed to next step.”
“Not OK”
Repair the problem. If
conditions are not resolved
then proceed to next step.
“Connect Display to 12 Volt Power Source”
Disconnect display from vehicle wiring and connect to another 12 Volt DC power
source.
Connect pin 3 (red wire from display) to the positive terminal
(+ Battery) of the power source. Connect pin 4 (black wire from display) to the
negative terminal “(-Battery)” of the power source.
The display should illuminate. The display will not communicate until the display is
connected to the data link.
Check wiring, connectors, or the vehicle battery for damage.
“OK”
Repair the components or
replace the components, as
required, proceed to next
step.
“Not OK”
Display is fault.
“Connect Display to Another Data Link Connector”
Disconnect display from the vehicle wiring harness. Connect the display to the
other data link connector. The display will activate when the display is connected
to the proper data link. The display will communicate when the display is
connected to the proper data link.
Connect the electronic service tool to the cab Data Link connector.
Turn the ignition key ON in order to verify that the data link is functional. . .Verify
that the connections to the display are not connected to the J1922 Data Link or
the J1939 Data Link.
If a cab data link connector is not available, connect the electronic service tool
directly to the engine ECM. Verify that the electronic service tool functions.
Confi gure a harness adapter to go from the Data Link connector for the display to
the appropriate data link connector. Refer to the “Harness Adapter Diagrams” in
order to view the pin-out for some common Data Link connectors.
Check the display’s wiring or connectors for damage.
“OK”
Repair the components or
replace the components, as
required.
“Not OK”
Proceed to the next step.