WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
343
2007 W Series Chassis
WSM082106
DTC P0963
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 P0963.
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 P0964
Circuit Description
The pressure control solenoid 2 (PCS2) is a pressure
proportional to current (PCC) solenoid used to control
on-coming, off-going and holding pressure to any 1
of the 5 clutches. The transmission control module
(TCM) provides voltage to the PCS2, shift solenoid
1, 2, and 3 (SS1, SS2, and SS3) through a separate
solid-state device called high side driver 2 (HSD2). The
TCM regulates the amount of current to the PCS2 by
switching the low side driver ON and OFF.
DTC P0964 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
• DTC P0964 Pressure Control Solenoid 2 (PCS2) Control
Circuit Open (B)
Conditions for Running the DTC
• DTC P2670 and P2671 are not active.
• The components are powered and ignition voltage is
greater than 9.0 volts and less than 18 volts.
• TCM initialization is in process or engine speed is
greater than 200 RPM and less than 7,500 RPM for less
than 5 seconds.
• TCM initialization is in process.
• Engine crank time is not extended.
Conditions for Setting the DTC
DTC P0964 sets when the TCM detects an open circuit
on the PCS2 return circuit for greater than 2 seconds.
Action Taken When the DTC Sets
• The TCM illuminates the malfunction indicator lamp
(MIL).
