WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
217
2007 W Series Chassis
WSM082106
a condition.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2. This step tests ignition voltage.
3. This step tests for TCC enable status.
DTC P0741
Step
Action
Value
Yes
No
Schematic Reference: Automatic Transmission Controls Schematics
1
Did you perform the Diagnostic System Check - Vehicle?
—
Go to Step 2
Go to Diagnostic
System Check -
Vehicle
2
1. Install the scan tool.
2. Turn ON the ignition, with the engine OFF.
IMPORTANT:
Before clearing the DTC, use the scan tool in order to record the
Before clearing the DTC, use the scan tool in order to record the
Freeze Frame and Failure Records for reference. The Clear Info
Freeze Frame and Failure Records for reference. The Clear Info
function will erase the data.
function will erase the data.
3. Record the DTC Freeze Frame and Failure Records.
4. Clear the DTC.
5. Using the scan tool, measure ignition voltage.
Is the voltage within the specified range?
9-18 V
Go to Step 3
Go to DTC P0562
for low voltage or
DTC P0563 for
high voltage
3
1. Drive the vehicle under normal operating conditions.
2. Using the scan tool, monitor converter slip speed indicated when a range
is attained where the TCC should be applied.
Is the slip speed value at or greater than the specified value when the TCC should
be applied?
80 RPM
Go to Step 4
Go to Diagnostic
Aids
