Installation manual

6-11
90-898305
The ECM requires 8 VDC minimum to operate. If the ECM should fail, the
engine will stop running. The inputs to the ECM can be monitored and tested
by the Digital Diagnostic Terminal 91-823686A2 using adaptor harness 84-
822560A5. The ECM performs the following functions:
• Calculates the precise fuel and ignition timing requirements based on
engine speed, throttle position, manifold pressure and coolant
temperature.
• Controls fuel injectors for each cylinder, direct injectors for each cylinder
and ignition for each cylinder.
• Controls all alarm horn and warning lamp functions.
• Maintains correct idle speed in or out of gear.
• Monitors oil pump solenoid coil.
• Monitors reserve oil tank level.
• Monitors air compressor temperature.
• Monitors engine temperature via coolant sensor.
• Monitors atmospheric pressure via MAP sensor
• Monitors shift interrupt via shift switch, above 600 RPM by reducing
engine power.
• Supplies tachometer signal to gauge
• Controls RPM limit function (caused by TPI fault, overheat, overspeed or
power reduction)
• Records engine operating history
• Records sensor fault history
Flywheel
The teeth under the flywheel ring gear provide engine rpm and crankshaft
position information to the ECM through the crank position sensor.
Notes
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