WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
95
2007 W Series Chassis
WSM082106
DIAGNOSTIC INFORMATION AND
PROCEDURES
DIAGNOSTIC STARTING POINT - AUTOMATIC
TRANSMISSION
Begin the system diagnosis with Diagnostic System
Check – Vehicle in Vehicle DTC Information. The
Diagnostic System Check provides the following
information:
• The identifi cation of the control module which commands
the system
• The ability of the control module or modules to
communicate through the serial data circuit
• The identifi cation and status of stored diagnostic trouble
codes (DTCs)
The use of Diagnostic System Check - Vehicle in Vehicle
DTC Information identifi es the correct procedure for
diagnosing the system and where the procedure is
located.
Symptoms
When it has been determined through Diagnostic
System Check – Vehicle in Vehicle DTC Information
that no DTCs are present, begin symptom diagnosis by
reviewing the Functional Test Procedure . This helps you
determine if the condition described by the customer is
normal or if a malfunction exists. If it is determined that
a malfunction exists, identify the concern by referring to
Symptoms - Automatic Transmission . The Symptoms
- Automatic Transmission provides common diagnostic
categories which relate directly to diagnostic information
or procedures.
SCAN TOOL DATA LIST
Scan Tool Parameter
Data List
Units
Displayed
Typical Data
Value
Engine is at Idle, Upper Radiator Hose is Hot, Closed Throttle, Gear
is in PARK, and Accessories are OFF.
1-2 Adapt Status Cell 0
F4
Fast/Slow
Varies
1-2 Adapt Status Cell 1
F4
Fast/Slow
Varies
1-2 Adapt Status Cell 2
F4
Fast/Slow
Varies
1-2 TAP Cell 1
F4
PSI
Varies
1-2 TAP Cell 2
F4
PSI
Varies
1-2 TAP Cell 3
F4
PSI
Varies
1-2 TAP Cell 4
F4
PSI
Varies
2-1 Adapt Status 0%
Throttle
F4
Fast/Slow
Varies
2-1 Adapt Status Full
Throttle
F4
Fast/Slow
Varies
2-1 Adapt Status Lift
Foot
F4
Fast/Slow
Varies
2-1 Adapt Status Part
Throttle
F4
Fast/Slow
Varies
2-1 Adapt Status Pre-
Select
F4
Fast/Slow
Varies
2-1 TAP Cell 1
F4
PSI
Varies
2-1 TAP Cell 2
F4
PSI
Varies
2-1 TAP Cell 3
F4
PSI
Varies
2-1 TAP Cell 4
F4
PSI
Varies
2-1 TAP Cell 5
F4
PSI
Varies
2-1 TAP Cell 6
F4
PSI
Varies
2-1 TAP Cell 7
F4
PSI
Varies
2-1 TAP Cell 8
F4
PSI
Varies
