WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
329
2007 W Series Chassis
WSM082106
DTC P0883
Circuit Description
The transmission control module (TCM) requires direct
battery voltage to operate properly.
DTC P0883 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
• DTC P0883 Transmission Control Module (TCM) Power
Input Signal High
Conditions for Running the DTC
• Engine speed is greater than 400 RPM for 1 second.
Conditions for Setting the DTC
DTC P0883 sets when the TCM detects battery direct voltage greater
than 18 volts for 6 out of 10 seconds.
Action Taken When the DTC Sets
• The TCM does not illuminate the malfunction indicator
lamp (MIL).
• Hydraulic default is commanded. Shift selector position
and hydraulic state of logic valves determine range.
• The TCM inhibits main modulation.
• The TCM inhibits torque converter clutch (TCC)
engagement.
Conditions for Clearing the DTC
A scan tool can clear the code from TCM history. The
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.
• This DTC is normally set due to vehicle charging system
concerns.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2. This step tests for proper TCM battery direct voltage.
3. This step tests the vehicle charging system.
