Page 1435 of 1501
3800 engines were suffering from exactly this. The point is that a
lack of detail could cause misdiagnosis.
As you might have guessed, a lab scope would not miss this.
RELATIONSHIP BETWEEN DWELL & DUTY CYCLE READINGS TABLE (1)
\
\
\
\
\
\
Dwell Meter (2) Duty Cycle Meter
1
.................................................... 1%
15 .................................................. 25%
30 .................................................. 50%
45 .................................................. 75%
60 ................................................. 100%
( 1) - These are just some examples for your understanding.
It is okay to fill in the gaps.
( 2) - Dwell meter on the six-cylinder scale.
\
\
\
\
\
\
THE TWO TYPES OF INJECTOR DRIVERS
OVERVIEW
There are two types of transistor driver circuits used to
operate electric fuel injectors: voltage controlled and current
controlled. The voltage controlled type is sometimes called a
"saturated switch" driver, while the current controlled type is
sometimes known as a "peak and hold" driver.
The basic difference between the two is the total resistance
of the injector circuit. Roughly speaking, if a particular leg in an
injector circuit has total resistance of 12 or more ohms, a voltage
control driver is used. If less than 12 ohms, a current control driver
is used.
It is a question of what is going to do the job of limiting
the current flow in the injector circuit; the inherent "high"
resistance in the injector circuit, or the transistor driver. Without
some form of control, the current flow through the injector would
cause the solenoid coil to overheat and result in a damaged injector.
VOLTAGE CONTROLLED CIRCUIT ("SATURATED SWITCH")
The voltage controlled driver inside the computer operates
much like a simple switch because it does not need to worry about
limiting current flow. Recall, this driver typically requires injector
circuits with a total leg resistance of 12 or more ohms.
The driver is either ON, closing/completing the circuit
(eliminating the voltage-drop), or OFF, opening the circuit (causing \
a
total voltage drop).
Some manufacturers call it a "saturated switch" driver. This
is because when switched ON, the driver allows the magnetic field in
the injector to build to saturation. This is the same "saturation"
property that you are familiar with for an ignition coil.
There are two ways "high" resistance can be built into an
injector circuit to limit current flow. One method uses an external
solenoid resistor and a low resistance injector, while the other uses
a high resistance injector without the solenoid resistor. See the left
side of Fig. 1.
In terms of injection opening time, the external resistor
voltage controlled circuit is somewhat faster than the voltage
controlled high resistance injector circuit. The trend, however, seems
to be moving toward use of this latter type of circuit due to its
lower cost and reliability. The ECU can compensate for slower opening
Page 1477 of 1501
WIPER/WASHER SYSTEM
1998 Mitsubishi Montero
1998 ACCESSORIES & EQUIPMENT
Mitsubishi - Wiper/Washer Systems
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport,
3000GT
DESCRIPTION & OPERATION
All models are equipped with a 2-speed wiper motor with an
optional intermittent wiper feature. Some models are equipped with a
rear wiper/washer.
Galant is equipped with a wiper system that varies
intermittent setting speed with vehicle speed. System uses ignition
switch, wiper switch, intermittent switch, washer switch, vehicle
speed sensor, and Electronic Time Alarm Control System (ETACS) ECU.
COMPONENT LOCATIONS
COMPONENT LOCATIONS TABLE \
\
\
\
\
\
Component Location
Assist-ECU (Diamante) ............. Above Right Kick Panel
ETACS-ECU ....................... Behind Left Side Of Dash
Wiper Relay
Front
Except Diamante &
3000GT ....................... Integral With Steering
Column Switch
Rear
Eclipse .............. Within Rear Wiper/Washer Switch
Montero &
Montero Sport ................ On Relay Block, Behind
Left Side Of Dash
3000GT ................ Behind Left Rear Quarter Panel
\
\
\
\
\
\
ADJUSTMENTS
FRONT WIPER ARM ADJUSTMENT
Ensure wiper motor is in park position. Position wiper arm
and blade assembly so tip of blade is specified distance above front
window trim. See FRONT WIPER ADJUSTMENT SPECIFICATIONS table.
FRONT WIPER ADJUSTMENT SPECIFICATIONS TABLE
\
\
\
\
\
\
Driver's Side Passenger's Side
Model In. (mm) In. (mm)
Diamante ....... 2.56-3.15 (65-80) .... .79-1.38 (20-35)
Eclipse .......... .19-.59 (5-15) .... 1.65-2.05 (42-52)
Galant ........... .39-.79 (10-20) ..... .39-.79 (10-20)
Mirage .......... .79-1.18 (20-30) .... .79-1.18 (20-30)
Montero ......... .98-1.38 (25-35) ... 1.38-1.77 (35-45)
Montero Sport ... .98-1.20 (25-31) ... 1.20-1.50 (31-38)
3000GT ........... .59-.79 (15-20) ..... .59-.79 (15-20)
\
\
\
\
\
\
Page 1481 of 1501
NOTE: On Diamante, assist-ECU controls wiper circuit. On all
models except 3000GT, intermittent wiper relay is
incorporated into wiper switch. Information on testing is
not available from manufacturer at time of publication.
Continuity & Voltage Check (3000GT)
1) Disconnect column switch connector. Ensure continuity is
present between terminals No. 5 and 11, and between terminals No. 6
and 10. See Fig. 3. Ensure there is no continuity between terminals
No. 6 and 11.
2) Connect battery voltage to relay terminal No. 5 and ground
terminal No. 11. Battery voltage should be present on terminal No. 6.
Replace relay if continuity and voltage is not as specified.
Fig. 3: Identifying Front Wiper Relay Terminals (3000GT)
Courtesy of Mitsubishi Motor Sales of America
FRONT WIPER SWITCH TEST
