WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
443
2007 W Series Chassis
WSM082106
FUNCTIONAL TEST
Functional Test Procedure
Functional Test Procedure
Step
Action
Yes
No
The Functional Test Procedure is the first step in diagnosing mechanical or hydraulic transmission conditions. The Functional Test Procedure pro-
vides procedures and references to the symptom diagnosis table for specific diagnostic information.
1
IMPORTANT:
Engine performance can strongly affect transmission performance. Ensure
Engine performance can strongly affect transmission performance. Ensure
the condition is not the result of poor engine performance before continuing.
the condition is not the result of poor engine performance before continuing.
Verify the customer concern.
Has the customer concern been verified?
Go to Step 2
--
2
IMPORTANT:
Many transmissions have default actions that take place once a DTC fault is
Many transmissions have default actions that take place once a DTC fault is
detected. These actions may appear to be transmission concerns.
detected. These actions may appear to be transmission concerns.
Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information.
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 3
Go to Diagnostic
System Check -
Vehicle in Vehicle
DTC Information
Functional Test Pro
Step
Action
3
Inspect for the following conditions:
• Vehicle damage
• Transmission oil pan damage. Refer to Oil Pan Replacement.
• Transmission range selector cable damaged or out of adjustment. Ref
mission Range Selector Lever Cable Adjustment or Automatic Transmi
Lever Cable Replacement.
• Inspect for loose, worn, damaged or missing:
– Mounts or struts
– Brackets
– Mounting hardware
– Refer to Transmission Replacement.
• Transmission cooler or cooler line restrictions. Refer to Automatic Tra
Flushing and Flow Test.
• Fluid leaks. Refer to Fluid Leak Diagnosis.
Did you find a condition?
4
Perform the Transmission Fluid Checking. Did you perform the Transmi
5
Perform the Road Test. Did the vehicle exhibit any objectionable perform
6
Did the vehicle exhibit objectionable torque converter operation?
7
Did the vehicle produce any objectionable noise condition?
8
Did the vehicle exhibit a vibration condition?
9
Did the vibration occur only during torque converter clutch (TCC) apply o
10
Did the vehicle exhibit a shift speed condition, such as low or high shift s
