WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
165
2007 W Series Chassis
WSM082106
TCM automatically clears the DTC from TCM history if
the vehicle completes 40 warm-up cycles without failure.
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.
• A short to ground allows DTC P0713 to set.
• A short to power may also damage the TFT sensor.
Test Description
The numbers below refer to step numbers on the
diagnostic table.
4. This step tests 5-volt reference.
6. This step tests the TFT sensor and internal wiring
harness.
7. This step tests the resistance of the TFT sensor.
