battery MITSUBISHI MONTERO 1991 Service Manual
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 1991, Model line: MONTERO, Model: MITSUBISHI MONTERO 1991Pages: 1333, PDF Size: 24.61 MB
Page 1276 of 1333
will need to shift your Lab Scope to five volts per division.
You will find that some systems have slight voltage
fluctuations here. This can occur if the injector feed wire is also
used to power up other cycling components, like the ignition coil(s).
Slight voltage fluctuations are normal and are no reason for concern.
Major voltage fluctuations are a different story, however. Major
voltage shifts on the injector feed line will create injector
performance problems. Look for excessive resistance problems in the
feed circuit if you see big shifts and repair as necessary.
Note that circuits with external injector resistors will not
be any different because the resistor does not affect open circuit
voltage.
Point "B" is where the driver completes the circuit to
ground. This point of the waveform should be a clean square point
straight down with no rounded edges. It is during this period that
current saturation of the injector windings is taking place and the
driver is heavily stressed. Weak drivers will distort this vertical
line.
Point "C" represents the voltage drop across the injector
windings. Point "C" should come very close to the ground reference
point, but not quite touch. This is because the driver has a small
amount of inherent resistance. Any significant offset from ground is
an indication of a resistance problem on the ground circuit that needs
repaired. You might miss this fault if you do not use the negative
battery post for your Lab Scope hook-up, so it is HIGHLY recommended
that you use the battery as your hook-up.
The points between "B" and "D" represent the time in
milliseconds that the injector is being energized or held open. This
line at Point "C" should remain flat. Any distortion or upward bend
indicates a ground problem, short problem, or a weak driver. Alert
readers will catch that this is exactly opposite of the current
controlled type drivers (explained in the next section), because they
bend upwards at this point.
How come the difference? Because of the total circuit
resistance. Voltage controlled driver circuits have a high resistance
of 12+ ohms that slows the building of the magnetic field in the
injector. Hence, no counter voltage is built up and the line remains
flat.
On the other hand, the current controlled driver circuit has
low resistance which allows for a rapid magnetic field build-up. This
causes a slight inductive rise (created by the effects of counter
voltage) and hence, the upward bend. You should not see that here with
voltage controlled circuits.
Point "D" represents the electrical condition of the injector
windings. The height of this voltage spike (inductive kick) is
proportional to the number of windings and the current flow through
them. The more current flow and greater number of windings, the more
potential for a greater inductive kick. The opposite is also true. The
less current flow or fewer windings means less inductive kick.
Typically you should see a minimum 35 volts at the top of Point "D".
If you do see approximately 35 volts, it is because a zener
diode is used with the driver to clamp the voltage. Make sure the
beginning top of the spike is squared off, indicating the zener dumped
the remainder of the spike. If it is not squared, that indicates the
spike is not strong enough to make the zener fully dump, meaning the
injector has a weak winding.
If a zener diode is not used in the computer, the spike from
a good injector will be 60 or more volts.
Point "E" brings us to a very interesting section. As you
can see, the voltage dissipates back to supply value after the peak of
the inductive kick. Notice the slight hump? This is actually the
mechanical injector pintle closing. Recall that moving an iron core
through a magnetic field will create a voltage surge. The pintle is
Page 1278 of 1333
drivers. They typically require injector circuits
with a total leg resistance with less than 12 ohm.
NOTE: This example is based on a constant power/switched ground
circuit.
* See Fig. 3 for pattern that the following text describes.
Point "A" is where system voltage is supplied to the
injector. A good hot run voltage is usually 13.5 or more volts. This
point, commonly known as open circuit voltage, is critical because the
injector will not get sufficient current saturation if there is a
voltage shortfall. To obtain a good look at this precise point, you
will need to shift your Lab Scope to five volts per division.
You will find that some systems have slight voltage
fluctuations here. This could occur if the injector feed wire is also
used to power up other cycling components, like the ignition coil(s).
Slight voltage fluctuations are normal and are no reason for concern.
Major voltage fluctuations are a different story, however. Major
voltage shifts on the injector feed line will create injector
performance problems. Look for excessive resistance problems in the
feed circuit if you see big shifts and repair as necessary.
Point "B" is where the driver completes the circuit to
ground. This point of the waveform should be a clean square point
straight down with no rounded edges. It is during this period that
current saturation of the injector windings is taking place and the
driver is heavily stressed. Weak drivers will distort this vertical
line.
Point "C" represents the voltage drop across the injector
windings. Point "C" should come very close to the ground reference
point, but not quite touch. This is because the driver has a small
amount of inherent resistance. Any significant offset from ground is
an indication of a resistance problem on the ground circuit that needs
repaired. You might miss this fault if you do not use the negative
battery post for your Lab Scope hook-up, so it is HIGHLY recommended
that you use the battery as your hook-up.
Right after Point "C", something interesting happens. Notice
the trace starts a normal upward bend. This slight inductive rise is
created by the effects of counter voltage and is normal. This is
because the low circuit resistance allowed a fast build-up of the
magnetic field, which in turn created the counter voltage.
Point "D" is the start of the current limiting, also known as
the "Hold" time. Before this point, the driver had allowed the current
to free-flow ("Peak") just to get the injector pintle open. By the
time point "D" occurs, the injector pintle has already opened and the
computer has just significantly throttled the current back. It does
this by only allowing a few volts through to maintain the minimum
current required to keep the pintle open.
The height of the voltage spike seen at the top of Point "D"
represents the electrical condition of the injector windings. The
height of this voltage spike (inductive kick) is proportional to the
number of windings and the current flow through them. The more current
flow and greater number of windings, the more potential for a greater
inductive kick. The opposite is also true. The less current flow or
fewer windings means less inductive kick. Typically you should see a
minimum 35 volts.
If you see approximately 35 volts, it is because a zener
diode is used with the driver to clamp the voltage. Make sure the
beginning top of the spike is squared off, indicating the zener dumped
the remainder of the spike. If it is not squared, that indicates the
spike is not strong enough to make the zener fully dump, meaning there
is a problem with a weak injector winding.
If a zener diode is not used in the computer, the spike from
Page 1311 of 1333
\003
WIP ER /W ASH ER S YSTE M
1991 M it s u bis h i M onte ro
1991 ACCESSORIES & SAFETY EQUIPMENT
Chrysler Motors/Mitsubishi Wiper/Washer Systems
Dodge; Ram-50
Mitsubishi: Montero, Pickup
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.
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
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Model Driver Side: In. (mm) Passenger Side: In. (mm\
)
Montero ............ 1.5-1.9 (37-47) ............. 1.5-1.9 (37-47\
)
Pickup & Ram-50 ........ .6 (15) ........................ 1.0 (25\
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REAR WIPER ARM ADJUSTMENT
NOTE: Pickup and Ram-50 are not equipped with rear wipers.
Ensure wiper motor is in park position. Position wiper arm
and blade assembly so tip of blade is specified distance from edge of
window. See REAR WIPER ADJUSTMENT SPECIFICATIONS table.
REAR WIPER ADJUSTMENT SPECIFICATIONS TABLE
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Model In. (mm)
Montero ....................................... ( 2) *
( 2) - Blade parallel with lower edge of window.
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TESTING
FRONT WIPER MOTOR
Checking Wiper Motor Operation ( Montero, Pickup & Ram-50)
Disconnect wiring connector from wiper motor. Connect battery
voltage to appropriate wiper motor terminal, and ground other
terminal. See WIPER MOTOR OPERATION CHECK table. See Fig. 1. Ensure
wiper motor operates in both low and high speeds.
WIPER MOTOR OPERATION CHECK TABLE
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Page 1312 of 1333
Model & Ground Apply Voltage
Application Terminal No. To Terminal No.
Low Speed Operation
Montero ...................... 3 ............................. 1
Pickup & Ram-50 .............. 1 ............................. 3
High Speed Operation
Montero ...................... 4 ............................. 1
Pickup & Ram-50 .............. 2 ............................. 3
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Fig. 1: Front Wiper Motor Terminal ID (Montero, Pickup & Ram-50)
Courtesy of Mitsubishi Motor Sales of America.
Checking Automatic Stop (Montero, Pickup & Ram-50)
1)Operate wiper motor at low speed. See CHECKING WIPER MOTOR
OPERATION. Disconnect battery voltage to stop motor in any position
except park.
2) Using a jumper wire, connect 2 terminals indicated. See
AUTOMATIC STOP CHECK table. See Fig. 1. Connect 12 volts to terminal
indicated in table, and ground wiper motor bracket. Ensure motor parks
wiper arm.
AUTOMATIC STOP CHECK TABLE
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Model Jumper Pin Nos. Apply Voltage To Pin Nos.
Montero ................ 3 & 2 ................................. 1
Pickup & Ram-50 ........ 1 & 4 ................................. 3
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FRONT WIPER RELAY
NOTE: On Pickup, Ram-50,intermittent wiper relay is incorporated
into wiper switch. See STEERING COLUMN SWITCHES article in
the ACCESSORIES/SAFETY EQUIP Section. Precis does not have a
front wiper relay.
Continuity Check (Montero)
Remove relay. Relay is located behind driver's kick panel.
Make sure continuity is present between terminals No. 2 and 5. See
Fig. 2 .
Page 1313 of 1333
Fig. 2: Identifying Front Wiper Relay Terminals (Montero)
Courtesy of Mitsubishi Motor Sales of America.
Intermittent Operation Check (Montero)
1) Connect battery voltage to terminal No. 1 and ground
terminal No. 6. See Fig. 2. Connect a jumper wire with test light
between battery positive and terminal No. 2.
2) Connect one end of a jumper wire to terminal No. 3 and
touch the other end to negative terminal on battery. Test light should
illuminate briefly and then go out after terminal No. 3 is touched to
battery ground.
FRONT WIPER SWITCH
NOTE: Front wiper switch is located on steering column.
See STEERING COLUMN SWITCHES article in the
ACCESSORIES/SAFETY EQUIP Section.
REAR WIPER MOTOR
Operation Check (Montero)
Disconnect wiring connector from wiper motor. Connect battery
voltage to one terminal and ground to other terminal to ensure
automatic operation. See REAR WIPER MOTOR OPERATION CHECK table for
terminal numbers and model application. See Fig. 3.
REAR WIPER MOTOR OPERATION CHECK TABLE
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Model Ground Pin No. Apply Voltage To Pin Nos.
Montero ................. 3 .................................... 1
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Page 1314 of 1333
Fig. 3: Identifying Rear Wiper Motor Terminals (Montero)
Courtesy of Mitsubishi Motor Sales of America.
Automatic Stop Check (Montero)
1) Start motor operation by connecting battery voltage to one
terminal and grounding another terminal. See
REAR WIPER MOTOR OPERATION CHECK table. See Fig. 3. Disconnect wires
during operation to stop motor in mid-sweep.
2) Jumper terminals No. 2 and 3 together. Connect battery
voltage to remaining terminal and ground wiper motor bracket. Ensure
motor parks wiper arm.
REAR WIPER RELAY
Operation Check (Montero)
Relay is located to right of heater blower assembly. Leave
intermittent relay connected to wiring harness. Operate rear wiper and
check voltage at terminal No. 1. See Fig. 4. There should be 12 volts
when rear wiper stops. Zero volts should be present when rear wiper is
operating.
Fig. 4: Identifying Rear Wiper Relay Terminals
Courtesy of Mitsubishi Motor Sales of America.
REAR WIPER SWITCH
Page 1318 of 1333
Fig. 1: Identifying Tie-Off Symbols
4) If the wires are not drawn all the way to another
component (across several pages), a reference will tell you their
final destination.
5) Again, use the legend on the first page of the wiring
diagram to determine the grid number and letter of the referenced
component. You can then turn directly to it without tracing wires
across several pages.
6) The symbols shown in Fig. 1 are called tie-offs. The first
tie-off shown indicates that the circuit goes to the temperature
sensor, and is also a ground circuit.
7) The second symbol indicates that the circuit goes to a
battery positive parallel circuit. The third symbol leads to a
particular component and the location is also given.
8) The lines shown in Fig. 2 are called options. Which path
or option to take depends on what engine or systems the vehicle has.
Page 1325 of 1333
WIR IN G D IA G RAM S
1991 M it s u bis h i M onte ro
1991 Wiring Diagrams
Mitsubishi
Montero
IDENTIFICATION
COMPONENT LOCATION MENU
COMPONENT LOCATIONS TABLE \
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Component Figure No. (Location)
A/C RELAYS .......................... 4 (C 12), 4 (A-B 15)
A/C SYSTEM ................................. 4 (A-C 12-15)
ALTERNATOR ................................... 1 (B-C 1-2)
ALTERNATOR RELAY ............................... 1 (C 1-2)
AUTO FREE-WHEELING HUB CONTROL UNIT ............. 3 (D 11)
BACK DOOR LOCK SW ............................... 7 (B 27)
BACK-UP LT SW (M/T) ............................. 7 (A 26)
BATTERY .......................................... 1 (A 1)
BLOWER SWITCH ................................. 4 (A-B 12)
BUZZER .......................................... 5 (E 17)
CARGO LIGHT ..................................... 6 (A 23)
CIG LIGHTER ..................................... 3 (E 11)
CLOCK ........................................... 3 (E 11)
COLUMN SW ..................................... 5 (A-E 19)
CRUISE CONTROL SYSTEM ...................... 4 (D-E 13-15)
DEFOGGER ...................................... 7 (C-D 27)
DIAG CONNECTION .................................. 2 (E 7)
DIMMER CONTROL SWITCH ............................ 3 (E 8)
DIR FLASHER ..................................... 5 (C 16)
DIR SWITCH ...................................... 5 (C 19)
DOME LT ............................... 6 (A 23), 7 (A 24)
DOOR LOCK SYSTEM ........................... 6 (D-E 21-23)
DOOR SWITCHES ......................... 5 (D 17), 6 (C 23)
FRONT WIPER SYSTEM ........................... 5 (A 16-17)
FUEL GAUGE UNIT ................................. 6 (C 22)
FUEL PUMP ........................................ 2 (C 4)
FUSE BLOCK .................................... 3 (C 9-10)
HAZARD FLASHER .................................. 5 (C 16)
HAZARD SW ....................................... 5 (B 16)
HEAD LIGHT WASHER RELAY ....................... 5 (C-D 17)
HEATER RELAY .................................... 4 (A 12)
HORN SWITCH ..................................... 5 (E 19)
IGNITION COIL .................................... 2 (E 4)
IGNITION SW ..................................... 3 (A 11)
ILLUMINATION LIGHTS ............................ 3 (D-E 8)
INHIBITOR SW ..................................... 3 (A 9)
INSTRUMENT CLUSTER ............................ 6 (A-D 20)
KEY REMINDER SW ................................. 5 (E-17)
LIGHT CONTROL RELAY ............................. 5 (E 19)
LIGHT SWITCH .................................... 5 (D 19)
MAIN FUSE LINKS ................................ 1 (A 1-2)
METER UNIT ...................................... 6 (E 20)
MPI CONTROL RELAY ................................ 2 (B 4)
MPI CONTROL UNIT ............................... 2 (A 4-7)
NOISE FILTER ..................................... 2 (E 6)
OVERDRIVE CONTROL RELAY .......................... 3 (A 8)