Workhorse ALLISON 1000MH Service Manual page 113

WORKHORSE CUSTOM CHASSIS
Service Manual
DTC P0561
Step
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?
7 1. Start the engine.
2. Operate all accessories. Refer to Checking Aftermarket
Accessories
Did voltage fl uctuate by the specifi ed amount?
8 Determine the cause of the accessory voltage drop. Refer to Circuit
Testing and Wiring Repairs.
Did you find and correct the condition?
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?
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?
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?
WSM082106
SECTION
7.2
Action
© 2006 Workhorse Custom Chassis — All Rights Reserved
PAGE
113
Automatic Transmission – Allison
Value
— Go to Step 10
4V Go to Step 8
— Go to Step 10
— Go to Step 10
— Go to Step 11
— Go to Diagnostic
Trouble Code (DTC)
List - Vehicle
2007 W Series Chassis
Yes No
Go to Step 9
Go to Step 9
Go to Diagnostic Aids
Go to Step 2
System OK
2007 W Series