WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
406
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
Diagnostic Aids
• Inspect the wiring for poor electrical connections at the
TCM. Inspect for the following conditions:
– A bent terminal
– A backed-out terminal
– A damaged terminal
– Poor terminal tension
– A chafed wire
– A broken wire inside the insulation
• When diagnosing for an intermittent short or open,
massage the wiring harness while watching the test
equipment for a change.
• You may have to drive the vehicle in order to experience
a condition.
• This DTC indicates the on-coming clutch being controlled
by PCS1 is not applied or applied too slowly. This could
indicate a leak or obstruction in a specifi c clutch apply
circuit. Observe scan tool failure record data for previous
or current range information when the DTC was set, in
order to determine the specifi c shift when the DTC was
set. Refer to the Solenoid and Clutch Chart to determine
which clutch circuit is suspect.
IMPORTANT:
Clutch failure due to installation of an engine power
Clutch failure due to installation of an engine power
upgrade is not covered under the manufacturers war-
upgrade is not covered under the manufacturers war-
ranty.
ranty.
Inspect for the presence of an add-on engine power
package. When engine horsepower or torque is
increased over factory rating, a shift fl are condition may
occur.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
3. This step tests for proper ignition voltage.
4. This step tests for erratic speed sensor readings.
5. This step tests for internal hydraulic leakage.
6. This step tests for clutch capacity.
