366 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
ECI System (Engine Crank Inhibit)
Figure 416 Function diagram for ECI system
The function diagram for the ECI system consists of
the follow i ng.
• Electronic Control Module (ECM)
•Starter
• Starter relay
• World Transmission Electron ica lly Controlled
(WTEC)
• Neutral Start Backup Switch (NSBU)
• Driveline Disengagement Switch (DDS)
Function
The Engine Crank Inhibit (ECI) is a function of the
ECM to control the operation of the starter. The ECM
prevents engagement of the starter when the engine
is running. This prevents damage to the starter pinion
andringgear. Thetransmissionneutralsafetyswitch
or clutch switch prevents engagement of the starter
when the transmission is in gear or when the clutch
pedal is not depressed.
The engine starter relay controls battery voltage to
the starter solenoid. The starter relay can also be
controlled by a n optional over cran k th ermocoup le.
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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