WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
432
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P2763
Step
Action
Value
Yes
No
11
Perform the following procedure in order to verify the repair:
1. Clear the DTC.
2. Drive the vehicle under normal operating conditions.
3. Select Specific DTC.
4. Enter DTC P2763.
Has the test run and passed?
—
Go to Step 12
Go to Step 2
12
With the scan tool, observe the stored information, capture info, and DTC
Info.
Does the scan tool display any DTCs that you have not diagnosed?
—
Go to Diagnostic
Trouble Code
(DTC) List -
Vehicle
System OK
DTC P2764
Circuit Description
The torque converter clutch (TCC) pressure control
solenoid (PCS) is a pressure proportional to current
(PCC) solenoid used to control the TCC apply and
release. The transmission control module (TCM)
provides voltage to the main modulation (MAIN MOD),
TCC and pressure control solenoid 1 (PCS1) through
a separate solid-state device called high side driver 1
(HSD1). The TCM regulates the amount of current to the
TCC PCS by switching the low side driver ON and OFF.
DTC P2764 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
• DTC P2764 Torque Converter Clutch (TCC) Pressure
Control Solenoid (PCS) Control Circuit Low
Conditions for Running the DTC
• DTC P0716, P0717, P0721, and P0722 are not active.
• The components are powered and ignition voltage is
greater than 9.0 volts and less than 18 volts.
• Engine speed is greater than 200 RPM and less than
7,500 RPM for 5 seconds.
• The TCM initialization is in process.
• The TCC is commanded ON.
Conditions for Setting the DTC
DTC P2764 sets when the TCM detects a short to
ground condition on the TCC PCS return circuit for
greater than 6 seconds.
Action Taken When the DTC Sets
• The TCM illuminates the malfunction indicator lamp (MIL).
• If the failure occurs while in a forward range, a shift to
