WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
198
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P0731
Step
Action
Value
Yes
No
3
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 4
Go to DTC P0562
for low voltage or
DTC P0563 for
high voltage
4
1. Start the engine.
2. Using the scan tool, observe the gear ratio.
Is the correct 1st range ratio shown?
3.10:1
Go to Step 5
Go to Diagnostic
Aids
5
1. Drive the vehicle under normal operating conditions.
2. Using the scan tool, monitor engine, turbine and output-speed readings.
Is speed sensor data erratic?
—
Go to the appropri-
ate speed sensor
DTC
Go to Step 6
6
Refer to Transmission Stall Test Notice.
Conduct a clutch test for 1st range. Refer to Clutch Test.
Did turbine speed remain at zero?
—
Go to Diagnostic
Aids
Go to Step 7
7
1. Remove the transmission oil pan. Refer to Automatic Transmission Fluid/
Filter Replacement .
2. Inspect for contaminated fluid and excessive material in the pan.
Is the fluid contaminated or excessive material found in the pan?
—
Go to Step 8
Go to Step 9
8
Remove the transmission for overhaul or replacement. Refer to Transmission
Replacement .
Did you complete the replacement?
—
Go to Step 11
—
