WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
148
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P0706
Step
Action
Value
Yes
No
5
1. Turn the ignition OFF.
2. Connect the 80-way connector to the TCM.
3. Disconnect the transmission AT inline 20-way connector. Additional
DTCs may set.
4. Install the J 44152 jumper harness (20 pins) on the engine side of the
AT inline 20-way connector.
5. Turn ON the ignition, with the engine OFF.
6. Using the J 35616 GM terminal test kit, connect a fused jumper wire,
in sequence, to terminals T, U, V and W to ground. Refer to Automatic
Transmission Inline Harness Connector End View.
Does each IMS signal indicate LOW when grounded and HIGH when open?
—
Go to Step 6
Go to Step 7
6
1. Turn the ignition OFF.
2. Connect the transmission AT inline 20-way connector.
3. Remove the transmission oil pan. Refer to Oil Pan Replacement .
4. Remove the AT internal wiring harness at the IMS connector.
5. Turn ON the ignition, with the engine OFF.
6. Using the J 35616 , connect a fused jumper wire, in sequence, to ter-
minals B, D, C and E to ground.
Does each IMS signal indicate LOW when grounded and HIGH when open?
—
Go to Step 9
Go to Step 8
7
Test the IMS circuit between the TCM and AT inline 20-way connector for an
open or short to ground condition. Refer to Circuit Testing .
Did you find and correct the condition?
—
Go to Step 11
—
8
Replace the internal wiring harness. Refer to Wiring Harness Replacement .
Did you complete the replacement?
—
Go to Step 11
—
9
Replace the internal mode switch. Refer to Transmission Internal Mode Switch
Replacement .
Did you complete the replacement?
—
Go to Step 11
—
