1998 MITSUBISHI MONTERO Service Manual

Application Wire Color Location
Diamante .................. Black/Blue ............ (1)
Eclipse (Turbo & 2.4L) .... Black/Blue ............. ( 2)
Galant .................... Black/Blue ............ ( 3)
Mirage .................... Black/Blue ............ ( 1)
Montero ...................... White .............. ( 4)
3000GT .................... Black/Blue ............ ( 6)
( 1) - On firewall, above brake master cylinder.
( 2) - On firewall behind battery.
( 3) - On main wiring harness, near center of firewall.
( 4) - On main wiring harness, near right center of firewall.
( 5) - Near left rear corner of engine compartment, below
cruise control actuator (if equipped).
( 6) - On main wiring harness, near wiper motor on firewall,
behind battery.









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3) Start engine and allow it to idle. Measure fuel pressure
with vacuum hose connected to fuel pressure regulator. Record fuel
pressure reading. See FUEL PUMP PERFORMANCE table. Disconnect and plug
vacuum hose from fuel pressure regulator. Record fuel pressure
reading.
4) Check for fuel pressure in fuel return hose by gently
pinching hose while increasing engine speed. If fuel volume is low,
fuel pressure in return hose will not be felt. Increase engine speed
to 2500-3000 RPM, 2-3 times. Return engine to idle. Fuel pressure
should not drop when engine is returned to idle.
5) Turn ignition off. Ensure fuel pressure reading does not
decrease within 2 minutes. If a decrease is noted, monitor speed of
decrease.
6) If fuel pressure is lower than specification, fuel
pressure drops at idle after increasing engine speed to 2500-3000 RPM,
or no fuel pressure in fuel return hose can be felt, check for clogged
fuel filter, or faulty fuel pressure regulator or fuel pump.
7) If fuel pressure is greater than specification, check for
a faulty fuel pressure regulator or plugged fuel return line. If fuel
pressure does not change when vacuum hose to regulator is connected or
disconnected, check for a leaking or clogged vacuum hose to fuel
pressure regulator or faulty fuel pressure regulator.
8) If fuel pressure decreases suddenly after engine is
stopped, check valve in fuel pump is not seated. Replace fuel pump. If
fuel pressure drops slowly, fuel injector is leaking or fuel pressure
regulator valve seat is leaking. Check for faulty fuel injector or
fuel pressure regulator. Repair as necessary.
9) When fuel pressure test is complete, repeat fuel pressure
release procedure before disconnecting fuel pressure gauge. Install
NEW "O" ring at end of high pressure fuel inlet line. Check for fuel
leaks.
FUEL PUMP PERFORMANCE TABLE









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At Idle w/Vacuum At Idle w/o Vacuum
Application psi (kg/cm) psi (kg/cm)
Eclipse 2.0L
Non-Turbo ........... ( 1) ............ 47-50 (3.3-3.5)
Turbo ............. 33 (2.3) ......... 42-45 (3.0-3.5)
3000GT Turbo ........ 34 (2.4) ......... 43-45 (3.0-3.1)
All Other Models .... 38 (2.7) ......... 47-50 (3.3-3.5)
( 1) - Information is not available from manufacturer at time

of publication.








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MFI CONTROL RELAY
MFI control relay switches power to vehicle sensors and
actuators including Volume Airflow (VAF) sensor, crankshaft position
sensor, idle speed control, injectors and fuel pump. When ignition
switch is turned to RUN position, PCM energizes coils controlling
injectors, VAF sensor and idle air control. When ignition switch is
turned to START position, PCM energizes coils (through park/neutral
position switch on A/T models) to supply power to fuel pump. Relay
failure will cause a no-start condition. For testing procedure, see I
- SYSTEM/COMPONENT TESTS article.
IGNITION CHECKS
* PLEASE READ THIS FIRST *
NOTE: Perform all circuit tests with a Digital Volt-Ohmmeter
(DVOM) with a minimum 10-megohm input impedance, unless
stated otherwise in test procedure.
SPARK
Check for spark at coil wire (if applicable) and at each
spark plug wire using a high output spark tester. Check spark plug
wire resistance on suspect wires. Wire resistance should not exceed
22,000 ohms for all models except Eclipse 2.0L non-turbo and Montero.
On Eclipse 2.0L non-turbo, resistance should not exceed 8000 ohms. On
Montero, resistance should not exceed 26,000 ohms.
CAMSHAFT POSITION (CMP) SENSOR
For CMP sensor testing procedure, see G - TESTS W/CODES
article.
CRANKSHAFT POSITION (CKP) SENSOR
For CKP sensor testing procedure, see G - TESTS W/CODES
article.
DISTRIBUTORLESS IGNITION SYSTEM (DIS - 4-CYLINDER)
Ignition Coil Resistance (Eclipse)
1) On Mirage 1.8L, see POWER TRANSISTOR (MIRAGE). On Eclipse\
2.0L non-turbo, go to step 3). On Eclipse 2.0L turbo and 2.4L,
disconnect ignition coil connector. Go to next step.
2) On Eclipse 2.0L turbo, use DVOM to measure primary coil
resistance between ignition coil connector terminals No. 2 and 3 (coil
for cylinders No. 1 and 4) and terminals No. 1 and 3 (coil for
cylinders No. 2 and 3). See Fig. 3. On Eclipse 2.4L, use DVOM to
measure primary coil resistance Between ignition coil terminals. Go to
step 4).
Fig. 2: Ignition Coil Connector Terminals (Eclipse 2.0L Non-Turbo)
Courtesy of Mitsubishi Motor Sales of America

Fig. 3: Ignition Coil Connector Terminals (Eclipse 2.0L Turbo)
Courtesy of Mitsubishi Motor Sales of America
3) Disconnect ignition coil connector. Using DVOM, measure
primary coil resistance at coil (component side) 3-pin connector.

Measure between center and right terminals of connector for cylinders
No. 1 and 4, and between center and left terminals of connector for
cylinders No. 2 and 3.
4) On all models, remove ignition wires from coil. Measure
secondary coil resistance between coil towers for cylinders No. 1 and
4 and between coil towers for cylinders No. 2 and 3. Primary and
secondary coil resistance should be within specification. See
IGNITION COIL RESISTANCE (ECLIPSE) table. Connect coil harness
connector. Connect ignition wires to coil.
IGNITION COIL RESISTANCE (ECLIPSE) - Ohms @ 68
F (20C) TABLE








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Application Primary Secondary
2.0L
Non-Turbo ............ .51-.61 ......... 11,500-13,500
Turbo ................ .70-.86 ......... 11,300-15,300
2.4L ................... .74-.90 ......... 20,100-27,300









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Power Transistor (Eclipse 2.0L Turbo & 2.4L)
1) To test the section of the power transistor that controls
cylinders No. 1 and 4, disconnect power transistor connector. Using a
1.5-volt dry cell battery, connect negative end of battery to terminal
No. 3 of power transistor and positive end to terminal No. 7. See
Fig. 4 .
Fig. 4: Identifying Power Transistor Connector Terminals (Eclipse
2.0L Turbo & 2.4L)
Courtesy of Mitsubishi Motor Sales of America
2) Using an analog ohmmeter, check for continuity between
terminals No. 3 and 8 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
3) To test the section of the power transistor that controls
cylinders No. 2 and 3, connect negative end of 1.5-volt dry cell
battery to terminal No. 3 of power transistor and positive end to
terminal No. 2.
4) Using an analog ohmmeter, check for continuity between
terminals No. 1 and 3 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
Power Transistor (Mirage)
1) Disconnect power transistor (distributor) connector. Usin\
g
a 1.5-volt dry cell battery, connect negative end of battery to
terminal No. 4 of power transistor and positive end to terminal No. 3.
See Fig. 5 .

Fig. 5: Power Transistor Connector Terminals (Mirage 1.8L)
Courtesy of Mitsubishi Motor Sales of America
2) Using an analog ohmmeter, check for continuity between
terminals No. 2 and 3 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
DISTRIBUTORLESS IGNITION SYSTEM (DIS - V6)
Ignition Coil Resistance
1) On 3000GT DOHC, go to next step. On Montero and Montero
Sport, use DVOM to measure primary coil resistance between each
individual coil. To check secondary coil resistance, measure
resistance between towers of each individual coil. Replace coil if
primary and secondary coil resistances are not within specification.
See IGNITION COIL RESISTANCE (V6) table.
2) Using DVOM, measure primary coil resistance between
terminal No. 3 (power terminal) and each individual coil terminal. See\
Fig. 6 . Terminal No. 1 controls coil "B", terminal No. 2 controls coil
"A", and terminal No. 4 controls coil "C". See Fig. 7. To check
secondary coil resistance, measure resistance between towers of each
individual coil. Replace coil if primary and secondary coil

resistances are not within specification. See
IGNITION COIL RESISTANCE (V6) table.
IGNITION COIL RESISTANCE (V6) - Ohms @ 68
F (20C) TABLE








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Application Primary Secondary
3.0L
VIN J & K ............ .67-.81 ......... 11,300-15,300
VIN P ................ .74-.90 ......... 20,100-27,300
3.5L (VIN M) ........... .74-.90 ......... 20,100-27,300









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Fig. 6: Identifying Ignition Coil Terminals (3000GT DOHC)
Courtesy of Mitsubishi Motor Sales of America

Fig. 7: Identifying Ignition Coils (3000GT DOHC)
Courtesy of Mitsubishi Motor Sales of America
Power Transistor
1) To test section of power transistor that controls
cylinders No. 1 and 4 of ignition coil, disconnect power transistor
connector. Using a 1.5-volt dry cell battery, connect negative end of
1.5-volt battery to terminal No. 4 of power transistor and positive
end to terminal No. 3. See Fig. 8.
2) Using an analog ohmmeter, check for continuity between
terminals No. 4 and 13 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
3) To test section of power transistor that controls
cylinders No. 2 and 5 of ignition coil, connect negative end of 1.5-
volt battery to terminal No. 4 of power transistor and positive end to
terminal No. 2.
4) Using an analog ohmmeter, check for continuity between
terminals No. 4 and 12 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
5) To test section of power transistor that controls
cylinders No. 3 and 6 of ignition coil, connect negative end of 1.5-
volt battery to terminal No. 4 of power transistor and positive end to
terminal No. 1.
6) Using an analog ohmmeter, check for continuity between
terminals No. 4 and 11 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
Fig. 8: Identifying Power Transistor Terminals
Courtesy of Mitsubishi Motor Sales of America

HALL EFFECT IGNITION
Ignition Coil Resistance
Using a DVOM, measure primary coil resistance between
specified coil terminals. See Figs. 9-12. On Galant, measure between
terminals No. 11 and 12. On Mirage measure between terminals No. 1 and
2. On all other vehicles, measure between positive and negative
terminals. Measure secondary coil resistance between coil positive
terminal and ignition coil tower. Primary and secondary coil
resistance should be within specification. See
IGNITION COIL RESISTANCE TABLE .
IGNITION COIL RESISTANCE TABLE - Ohms @ 68
F (20C)








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Application Primary Secondary
1.5L (VIN A) ........... .50-.70 ......... 15,000-22,000
2.4L (VIN G)
Galant .............. .90-1.20 ......... 20,000-29,000
Montero Sport ........ .67-.81 ......... 11,300-15,300
3.0L (VIN H) ........... .72-.88 ......... 12,290-13,920
3.5L (VIN P) ........... .50-.70 ........... 9000-13,000









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Fig. 9: Ignition Coil Connectors Terminals (Except DIS - Diamante)
Courtesy of Mitsubishi Motor Sales of America