WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
428
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
DTC P2761
Step
Action
Value
Yes
No
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 P2763
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 P2763 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
• DTC P2763 Torque Converter Clutch (TCC) Pressure
Control Solenoid (PCS) Control Circuit High
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.
• TCM initialization is in process.
• The TCC is commanded ON.
Conditions for Setting the DTC
DTC P2763 sets when the TCM detects a short to voltage 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
1st, 3rd or 5th range is made.
• While diagnostic response is active, if the shift selector
is moved to NEUTRAL, the transmission will shift to
NEUTRAL. If the shift selector is moved to REVERSE,
the transmission will shift to REVERSE. If the shift
selector is moved to a forward range or to REVERSE
and the transmission is compromised by overspeeding or
direction change, the transmission will shift to NEUTRAL.
• DTC P2763 is stored in TCM history.
• The TCM inhibits MAIN MOD.
• The TCM inhibits REVERSE operation.
• The TCM freezes shift adapts.
• The TCM inhibits TCC engagement.
