WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
434
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P2764
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
Before clearing the DTC, use the scan tool in order to
record the Freeze Frame and Failure Records for reference.
record the Freeze Frame and Failure Records for reference.
The Clear Info function will erase the data.
The 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, measure ignition voltage.
Is voltage within the specified value?
9-18 V
Go to Step 3
Go to DTC
P0562 for low
voltage or DTC
P0563 for high
voltage
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. Turn ON the ignition.
5. Using the DMM, measure voltage between connector terminal 78
and ground.
6. Using the scan tool, command the TCC solenoid OFF.
Is the voltage within the specified value when the TCC solenoid is com-
manded OFF?
B+
Go to
Diagnostic Aids
Go to Step 4
4
1. Turn the ignition OFF.
2. Using the DMM, measure resistance at terminals 11 and 78.
Is the resistance reading within the specified value?
5.05 ohms at 20°C
(68°F)
Go to Step 10
Go to Step 5
