7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 311
• DTC 231 can be set when any of the following
conditions occur:
• Inoperative ATA device (transmission
controller or anti-lock brake controller) is
connected to ATA bus and pulls signal to
ground.
• Number of ATA devices exceeds limit
• Inoperative ECM
• When DTC 231 is active the amber ENGINE lamp
is not illuminated.
NOTE: Vehicles equipp e d with the Allison WTEC
transmission may display DTC 231 when attempting
to program the ECM. The WTEC controller must be
disconnected when programming the engine ECM.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Breakout Box
• Breakout Harness
The ATA circuit requires the use of vehicle circuit
diagrams. See truck Chassis E lectrical C ircuit
Diagram Manual for circuit numbers, connector and
fuse locations.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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