Navistar International DT 466 Diagnostic/Troubleshooting Manual page 315

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
• DTC 231 can be set when any of the following
conditions occur:
• Inoperative ATA
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 equipped 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.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
device (transmission
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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 Electrical Circuit
Diagram Manual for circuit numbers, connector and
fuse locations.
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