WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
423
2007 W Series Chassis
WSM082106
DTC P2730
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. Turn ON the ignition, with the engine OFF.
5. Using the DMM and the J 35616 GM terminal test kit, measure for
voltage at terminal M and ground of the J 44152 . Refer to Automatic
Transmission Inline Harness Connector End View.
Is the resistance within the specified value?
0 V
Go to Step 8
Go to Step 6
6
1. Connect the AT inline 20-way connector.
2. Remove the transmission oil pan. Refer to Oil Pan Replacement .
3. Remove the AT internal wiring harness at the PCS1 connector.
4. Using the DMM, measure for voltage at terminal 2 of the PCS1 and
ground.
Is the voltage greater than the specified value?
0 V
Go to Step 9
Go to Step 7
7
1. Disconnect the PCS1 from the internal wiring harness.
2. Using the DMM, measure PCS1 resistance.
Is the resistance within the specified value?
5.05 ohms at
20°C (68°F)
Go to Testing
for Intermittent
Conditions and
Poor Connections
Go to Step 10
8
Test the PCS1 circuit between the TCM and the AT inline 20-way connector
for a short to voltage. Refer to Testing for a Short to Voltage .
Did you find and correct the condition?
—
Go to Step 11
—
9
Replace the AT internal wiring harness. Refer to Wiring Harness
Replacement .
Did you complete the replacement?
—
Go to Step 11
—
10
Replace the PCS1. Refer to Control Valve Solenoid Replacement .
Did you complete the replacement?
—
Go to Step 11
—
