Subsection 01 (ENGINE MANAGEMENT SYSTEM (EMS))
ABBREVIATION
DEFINITION
BA
Ignition coil
CPS
Crankshaft position sensor
CTS
Coolant temperature sensor
ECM
Electronic control module
GBPS
Gear box position sensor
HIC1‡
Harness interconnect 1
HIC2‡
Harness interconnect 2
IACV
Idle air control valve
INJ1
Injector 1 (front)
INJ2
Injector 2 (rear)
MAPTS
Manifold absolute pressure and
temperature sensor
MD
4WD Actuator
OPS
Oil pressure switch
SD
4WD Signal
TPS
Throttle position sensor
VSS
Vehicle speed sensor
‡Refer to applicable
WIRING HARNESS AND
CONNECTORS
subsection for the vehicle harness.
GENERAL
SYSTEM DESCRIPTION
The HIC# connectors connect the vehicle harness
to the powertrain harness.
There are 6 main systems that are controlled by
the engine management system (EMS):
1. Electronic Fuel Injection (EFI)
2. Cooling system (cooling fan)
3. Ignition system
4. Starting system
5. Fuel pump system
6. D.E.S.S. system.
NOTE:
For further information related to these
systems, refer to the applicable subsection.
The ECM (Engine Control Module) is the central
point of the engine management system.
vmr2008-132-005
TYPICAL - ECM
The ECM is located behind the LH panel.
vmr2012-022-002_a
LH PANEL REMOVED
1. ECM location
The ECM reads input signals from various
switches, controls, and sensors, that it compares
to pre-determined parameters, makes computa-
tions, and provides control signal outputs required
for proper engine management.
The ECM also interacts through CAN bus with
the gauge module for various functions, informa-
tion exchange and display of messages. Refer
to
CONTROLLER AREA NETWORK (CAN)
and
LIGHTS, GAUGE AND ACCESSORIES
subsec-
tions.
The ECM also features a permanent memory that
will store the information on the various ignition
keys programmed to the vehicle, fault codes, cus-
tomer information, and other engine information,
even when the battery is removed from the vehi-
cle.
vmr2016-127
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