Mitsubishi Montero (1998+). Manual - part 177

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.

         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

                    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.

         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 (20



C) TABLE

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

         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. Using

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.