Eci System (Engine Crank Inhibit) - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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 following.
• Electronic Control Module (ECM)
• Starter
• Starter relay
• World Transmission Electronically Controlled
(WTEC)
• Neutral Start Backup Switch (NSBU)
• Driveline Disengagement Switch (DDS)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
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
and ring gear. The transmission neutral safety switch
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 an optional over crank thermocouple.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.