Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 01 (OVERVIEW)
EMS — ENGINE MANAGEMENT FUNCTIONS
R1503motr220T
1503 4-TEC CONTROL SYSTEM
INPUTS OUTPUTS
Idle bypass valve
Fuel injector
Ignition coil (3)
TOPS valve
Starter solenoid
Fuel pump
Communication
port to VCM
Tip-over protection system (TOPS)
Start/Stop switch
Digitally Encoded
Security System (DESS)
Battery voltage (BV)
Knock sensor (KS)
Throttle position (TPS)
Crankshaft position (CPS)
Coolant temperature (CTS)
Manifold air temperature (MATS)
Manifold air pressure (MAPS)
Oil pressure (OPS)
Oil separator pressure (OSPS)
Camshaft position (CAPS)
ENGINE CONTROL
MODULE (ECM)
Exhaust gas temperature (EGTS)
This engine management system controls both
the fuel injection and the ignition timing.
As shown in the 1503 4-TEC CONTROL SYSTEM
illustration, the ECM is the central point of the fuel
injection system. It reads the inputs, makes com-
putations, uses pre-determined parameters and
sends the proper signals to the outputs for proper
engine management.
The ECM also stores the fault codes and general
information such as: operating conditions, vehicle
hours, serial numbers, customer and maintenance
information.
Electronic Fuel Injection
The ECM reads the signals from different sensors
which indicate engine operating conditions at milli-
second intervals.
Signals from sensors are used by the ECM to de-
termine the injection parameters (fuel maps) re-
quired for optimum air-fuel ratio.
The CPS, the MATS, the MAPS and the TPS are
the primary sensors used to control the injection
and ignition timing. Other sensors (like tempera-
ture sensors, etc.) are used for secondary input.
smr2004-Complete Line Up 399
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