WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
324
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P0881
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
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. Using the scan tool, monitor TCM input voltage.
Is voltage within the specified value?
B+
Go to Diagnostic Aids
Go to Step 3
3
1. Turn the ignition OFF.
2. Disconnect the 80-way connector at the TCM.
3. Install the J 39700 breakout box, the J-47275 breakout box adapter
and the J 47275-1 magnetic overlay.
4. Use the DMM, and in sequence, measure voltage at connector termi-
nals 10 and 70 and a known good ground.
Is the voltage greater than the specified value?
B+
Go to Testing for
Intermittent Conditions
and Poor Connections
Go to Step 4
4
Test the battery positive voltage circuit or the engine control module (ECM) B
voltage circuit for loose or corroded connectors.
Did you find and correct a condition?
—
Go to Step 6
Go to Step 5
5
IMPORTANT:
In most cases, the TCM is not at fault. Investigate thoroughly
In most cases, the TCM is not at fault. Investigate thoroughly
before replacing the TCM.
before replacing the TCM.
Replace the TCM. Refer to Control Module References for replacement,
setup, and programming.
Did you complete the replacement?
—
Go to Step 6
—
