WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
113
2007 W Series Chassis
WSM082106
DTC P0561
Step
Action
Value
Yes
No
6
Test the ignition feed circuit for an open or short to ground. Refer to
Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
—
Go to Step 10
Go to Step 9
7
1. Start the engine.
2. Operate all accessories. Refer to Checking Aftermarket
Accessories
Did voltage fl uctuate by the specifi ed amount?
4V
Go to Step 8
Go to Step 9
8
Determine the cause of the accessory voltage drop. Refer to Circuit
Testing and Wiring Repairs.
Did you find and correct the condition?
—
Go to Step 10
Go to Diagnostic Aids
9
IMPORTANT:
In most cases, the TCM is not at fault. Investigate thor-
In most cases, the TCM is not at fault. Investigate thor-
oughly before replacing the TCM.
oughly before replacing the TCM.
Replace the TCM. Refer to Control Module References for replacement,
setup, and programming.
Did you complete the replacement?
—
Go to Step 10
10
Perform the following procedure in order to verify the repair:
1. Clear the DTC.
2. Using the scan tool, monitor TCM voltage.
3. Select Specific DTC.
4. Enter DTC P0561.
Has the test run and passed?
—
Go to Step 11
Go to Step 2
11
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
