WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
152
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P0708
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
Before clearing the DTC, use the scan tool in order to record
the Freeze Frame and Failure Records for reference. The
the Freeze Frame and Failure Records for reference. The
Clear Info function will erase the data.
Clear Info function will erase the data.
3. Record the DTC Freeze Frame and Failure Records.
4. Clear the DTC.
5. With the scan tool, monitor IMS A/B/C/P status while moving the shift
selector through each range. Refer to Transmission Internal Mode
Switch Logic.
Does each selected transmission range match the scan tool IMS display?
—
Go to Diagnostic
Aids
Go to Step 4
4
1. Turn the ignition OFF.
2. Install the J 39700 breakout box, the J-47275 breakout box adapter
and the J 47275-1 magnetic overlay at the TCM.
3. Disconnect the 16-way bypass connector on the J-47275 .
4. Turn ON the ignition, with the engine OFF.
5. In sequence, connect terminal 58 to terminals 14, 34, 53 and 73 to
ground.
6. Using the scan tool, monitor IMS A/B/C/P status.
Does each IMS signal indicate LOW when grounded and HIGH when open?
A = terminal 73
B = terminal 53
C = terminal 14
P = terminal 34
HIGH = Open
LOW = Grounded
Go to Step 5
Go to Step 10
