1990 MITSUBISHI ECLIPSE engine

3i
ELECTRICAL - Junction Block8-5JUNCTION
BLOCKThe junction block is a feature in which wiring
hamess
connections are centralized for simpler and more reliable wiringharness connections.
The junction block is provided under the instrumentdriver’s seat side.panelat the
CONSTRUCTION OF JUNCTION BLOCK
_.rheft-alarm
iom relay
To enginecompartment
wiring harness
. No connectionTo instrument
;;;+$ring
.’ ./%A0805relay
Rear side
NOTEThe alphabetical symbols on the connectors are associated with the
internal circuit diagrams
(PB-6).To bodywiring harness
he junction block is an integrated assembly ofltermediate connection connectors of wiring
har-ess, fuse box, and relay. On the front side of the
unction block, the connectors for connections from
le heater relay, fuse box, engine compartment
amess and instrument panel harness are provided.On the rear side, the connectors for connections
from the body harness are provided and are
con-
netted in the junction block as shown below.

ELECTRICAL -Relavs, Control Units and Sensors
RELAYS, CONTROL UNITS AND SENSORSROBEAACThe relays, control units and sensor for the various systems are located as described below.
.ILTI-POINT FUEL INJECTION SYSTEM
NameSymbolNameSymbolAir-flow sensor (incorporated within
AMagnet clutch relayG
barometric-pressure sensor andintake air temperature sensor)
Crank angle sensor and top dead center sensorCMPI control relayJDetonation sensor
FMPI control unitK
EGR temperature sensorEOxygen sensorH

Engine coolant temperature sensor
BThrottle position sensorDIdle switch
DVehicle speed sensor (reed switch)I
NOTEThe “Name” column is arranged in alphabetical order.
orated within barometric
re sensor and Intake arr7 (incorporated within barometnc kpressure sensor and intake arrtemperature sensor)-4L 1mo721

1ELECTRICAL
-Relays, Control Units and Sensors8-11HEATER AND AIR CONDITIONER
INameSymbolName
4ir conditioner control unitDCondenser fan motor relayAir inlet sensor
FEngine coolant temperature switch
Air therm0 sensor
FHeater relayBlower motor High relay
EMagnet clutch relay
$x$enser fan motor High-Low selectingCRadiator fan motor relay
NOTEThe “Name” column is arranged in alphabetical order.Symbol
C
A
G
C
B

ELECTRICAL- Relays, Control Units and Sensors8-13OTHER RELAYS AND CONTROL UNITS
NameSymbol
NameSymbol
Alternator relay
APower window relay
A
Defogger relayBRadiator fan motor relayA
Defogger timer
GSeatbelt timerG
Dome light relayHStarter relay G
Door lock control unitETaillight relayA
Door lock relayGTheft-alarm control unitEDaytime running light relay
1,2GTheft-alarm horn relayF
Fog light relay- Transistor relay DA
Intermittent wiper relay (rear wiper)
p Turn signal and hazard flasher unitFH-Intermittent wiper relay (windshield wiper)
C
NOTEThe “Name” column is arranged in alphabetical order.

Y Intermittent wiper relayz
(built-in column switch)
I

. . .&L : __,ELECTRICAL
- Inspection Terminal
INSPECTION TERMINAL
INameSymbolNameEngine speed detecting terminal
COxygen sensor check connector
Fuel pump check connectorASelf-diagnosis connectorIgnition timing adjustment connector
B -
NOTEThe “Name” column is arranged in alphabetical order.
Symbol
D
E16Ao734

ELECTRICAL- Ermine Electrical8-23
ENGINE ELECTRICALRoaGAABALTERNATOR
L terminal\Stern
Electronicvoltage regulator
B terminal/
Rectlfber‘i ‘IT
VFantl
GEL0051The alternator has a built-in electronic voltage regulator.
The output voltage is controlled by the voltage regulator
through detection of the battery voltage.
SPECIFICATIONS
Nominal output . . .._...._..65A: for Non-turbo Engine with M/T
75A: for Non-turbo Engine with AAand Turbo Engine
Regulated voltage. . . . . . . .14.4 f 0.3V at 20°C (68°F)
Rotating direction. . . . . . . .Clockwise(viewed from pulley side)
-

.-
8-24ELECTRICAL- Engine Electrical
STARTER MOTOR
Reduction gearMagnetic switch
S terminal
Shift lever
6ELOO53
!n
IArmature
1Pinion gearOverrunnIng
hlclutch -Permanent magnet
6EL0055
SPECIFICATIONS
Type................................Reductiondrive
Nominal output
............1.2 kWRotating direction
........Clockwise
(viewed from pinion side)
-.- .-

IGNITION SYSTEMELECTRICAL - Engine Electrical8-25
I
Sensors
Engine control unitlgnltlon switch
Battery
11 IPower transfstor
hhP 1
Ilgnltion coil
C To tachometerTerminal for engine
speed detectton
6ELOO45The ignition system is a two-coil ignition system that
supplies sufficient energy for ignition up to high
speeds. This engine does not have a distributor
since the engine control unit directly activates the
power transistor for ignition timing control.
The functions and controls of the engine control unit
and various sensors that control the ignition timing
are described in the next chapter, IGNITION CON-
TROL SYSTEM.
This ignition system has two power transistors and
two ignition coils. Power transistor “A” controls the
primary current of ignition coil “A” to activate thespark plugs of the
No.1 and No.4 cylinders.
Similarly, power transistor
“B” controls ignition coil
“B” which activates the spark plugs of the
No.2 and
No.3 cylinders. In this way, spark plugs of two
cylinders are activated but actual ignition takes placeonly in the single cylinder that is on its compression
stroke, because the other is on its exhaust stroke at
that time.
Power transistors “A” and “B” are activated by
signals from the engine control unit, that controls
which cylinder is fired at what time.