WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
334
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P0960
Step
Action
Value
Yes
No
5
1. Turn the ignition OFF.
2. Disconnect the AT inline 20-way connector. Additional DTCs may
set.
3. Install the J 44152 jumper harness (20 pins) on the engine side of
the AT inline 20-way connector.
4. Using the DMM and the J 35616 GM terminal test kit, measure
the resistance between terminals L and S of the J 44152 . Refer to
Automatic Transmission Inline Harness Connector End View .
Is the resistance within the specified value?
22.0 ohms at 20°C
(68°F)
Go to Step 7
Go to Step 6
6
1. Remove the transmission oil pan. Refer to Oil Pan Replacement.
2. Remove the AT internal wiring harness at the solenoid MAIN MOD
connector.
3. Using the DMM, measure the resistance of the MAIN MOD solenoid.
Is the solenoid resistance within the specified value?
22.0 ohms at 20°C
(68°F)
Go to Step 8
Go to Step 9
7
Test the MAIN MOD circuit between the TCM and the AT inline 20-way con-
nector for an open condition. Refer to Testing for Continuity .
Did you find and correct the condition?
—
Go to Step 11
Go to Step 10
8
Replace the AT internal wiring harness. Refer to Wiring Harness
Replacement .
Did you complete the replacement?
—
Go to Step 11
—
9
Replace the MAIN MOD solenoid. Refer to Control Valve Solenoid
Replacement .
Did you complete the replacement?
—
Go to Step 11
—
10
IMPORTANT:
In most cases, the TCM is not at fault. Investigate thorough-
In most cases, the TCM is not at fault. Investigate thorough-
ly before replacing the TCM.
ly 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 11
—
