Ecm Self Diagnostics (Electronic Control Module) - Navistar International DT 466 Diagnostic/Troubleshooting Manual

388 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

ECM Self Diagnostics (Electronic Control Module)

Figure 427 Function diagram for the ECM
The ECM does the following:
• Monitors and controls the engine operation and
performance
• Enables Power Takeoff and cruise control
• Communicates engine and vehicle information to
instrument cluster
• Enables electronically controlled transmission (for
vehicles with feature)
• Enables diagnostic programming tools
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Fault Detection / Management
The
self-checks.
programming, and internal power supply checks.
The ECM will detect internal Diagnostic Trouble
Codes (DTCs) depending on the severity of the
problem.
management strategies to permit limited engine and
vehicle operation.
When DTCs 613, 614, 621, 622, and 623 are set by
the ECM, the amber ENGINE lamp will be illuminated.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
ECM automatically
The ECM self-test includes memory,
Additionally, the ECM provides DTC
performs diagnostic