WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
440
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P2771
Step
Action
Yes
No
16
Perform the following procedure in order to verify the repair:
1. Clear the DTC.
2. Drive the vehicle under normal operating conditions. Monitor the 4WD low sta-
tus with the scan tool. The 4WD low status must indicate NO when 4WD HI is
selected, and YES when 4WD LO is selected.
3. Select Specific DTC.
4. Enter DTC P2771.
Has the test run and passed?
Go to Step 17
Go to Step 2
17
With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?
Go to Diagnostic
Trouble Code (DTC)
List - Vehicle
System OK
SYMPTOMS - AUTOMATIC TRANSMISSION
The following table consists of six diagnostic categories
that are located in the left-hand column. Using this
column, choose the appropriate category based on the
operating conditions of the vehicle or transmission. After
selecting a category, use the right-hand column to locate
the specifi c symptom diagnostic information.
Diagnostic Category
Diagnostic Information
IMPORTANT:
The Functional Test Procedure should be performed before beginning any diagnosis. If this procedure has not already
The Functional Test Procedure should be performed before beginning any diagnosis. If this procedure has not already
been performed, refer to Functional Test Procedure.
been performed, refer to Functional Test Procedure.
