Section052–TEC ENGINE MANAGEMENT
Subsection 01 (OVERVIEW)
High Coolant Temperature
Warning Device
When the coolant temperature is getting to high,
the ECM sends out signals to the buzzer and the
high temperature LED.
Power Distribution
The ECM distributes power from battery to all ac-
cessories. Accessories are protected by fuses lo-
cated in the fuse holder. Fuses are identified be-
sides their holder.
IMPORTANT: The sensors and injectors are con-
tinuously powered with the supply from the bat-
tery. The ECM switches the ground to com-
plete the electrical circuits it controls. Take this
into account when troubleshooting the electrical
system.
Electric Start SDI Models
The system uses 2 relays: an ignition relay (R1)
and a headlights and accessories relay (R2).
Manual Start SDI Models
The system uses 3 relays: an ignition relay (R1),
a second for the headlights and the accessories
(R2) and a third for the capacitor circuit (R4).
ECU — ENGINE MANAGEMENT FUNCTIONS
A32A1SS
ENGINE
CONTROL
MODULE
(ECM)
Throttle position sensor (TPS)
Knock sensor (KS)
Exhaust gas temperature sensor (EGTS)
Crankshaft position sensor (CPS)
Buzzer
Ignition coil
RAVE solenoid
Fuel injector (4)
Fuel pump
Speedometer
Communication port
INPUTS OUTPUTS
SDI SYSTEM
Air temperature sensor (ATS)
Air pressure sensor (APS)
Water temperature sensor (WTS)
Battery voltage
Digitally encoded security system (DESS)
START/ RER button
Oil tank low-level
Communication port
mmr2004-Rev 169
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