7–2. ROAD TEST AND VEHICLE OPERATION INSPECTION LIST
a. Driveability.
NOTE: Refer to the latest edition of the 3000 and 4000 Product
Families Transmission Operator’s Handbook or 3000MH and 4000MH
Owner’s Manual for operating instructions. Refer to the Customer
Service section, Table 8–1, for the latest publication number.
Drive-away tests are performed to verify proper transmission and support
equipment installation and operation. The following steps outline drive-away test
procedures:
• Determine fluid level—fill the transmission with the appropriate fluid
• Start the vehicle—determine proper system response during start-up
— Turn on the vehicle’s master/ignition switch.
— The CHECK TRANS light should come on
— Start the engine
— The CHECK TRANS light should go off
— “N” should appear in the shift selector display
• Clear Trouble Codes—during installation, it is common for “false” codes to
be stored in the electronic control’s ECU. These codes must be cleared
prior to road testing the vehicle.
• Road Test the Vehicle—allow the electronic control time to “converge”
shifts.
• Determine Proper Operation—inspect all components for proper mounting
and operation, and inspect for transmission fluid leaks at gasket surfaces,
lines, and hoses.
• Determine new Trouble Codes—use the Allison DOC™ For PC–Service
Tool, or shift selector to determine if codes were set during the road test.
Refer to Section 2–11, TROUBLESHOOTING, Paragraph c. Clearing
Trouble Codes Using Shift Selector and Paragraph d. Retrieving
Troubleshooting Codes.
• Troubleshoot—if codes exist after the road test, problems must be found
and corrected (refer to TS2973EN, WTEC III Troubleshooting Manual).
b. Service and Maintenance. Refer to the current issue of the 3000 and 4000
Product Families service manuals for detailed transmission service and
maintenance instructions. Refer to the latest issue of the WTEC III
Troubleshooting Manual for detailed electronic control system troubleshooting.
Refer to the Customer Service section, Table 8–1, for the latest publication
number.
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