1998 MITSUBISHI MONTERO engine

Knock Sensor
See G - TESTS W/CODES article.
EMISSION SYSTEMS & SUB-SYSTEMS
EXHAUST GAS RECIRCULATION (EGR)
EGR Control Solenoid Valve
See G - TESTS W/CODES article.
FUEL EVAPORATION
EVAP Purge Control Valve
See G - TESTS W/CODES article.
EVAP Purge Control Solenoid Valve
See G - TESTS W/CODES article.
POSITIVE CRANKCASE VENTILATION (PCV)
PCV Valve
Remove PCV valve. Shake valve. Valve should rattle if moving
freely. Apply air pressure to valve. Air should flow freely in one
direction only. Connect PCV valve to vacuum hose and start engine.
Ensure vacuum is flowing through valve.
MISCELLANEOUS CONTROLS
NOTE: Although the controlled devices listed here are not
technically engine performance components, they can affect
driveability if they malfunction.
NOTE: To identify PCM A/C power supply voltage terminals, see
appropriate pin voltage chart in J - PIN VOLTAGE CHARTS
article. To identify PCM A/C power supply circuit, see
appropriate wiring diagram in L - WIRING DIAGRAMS article.
A/C Switch & Compressor Clutch Relay
Using DVOM, check A/C power supply voltage from PCM. Turn
ignition switch to OFF position. Disconnect PCM connector. Turn A/C
switch and ignition switch to ON position. Check voltage between PCM
A/C power supply terminal and chassis ground. If battery voltage is
not as present, check and repair circuit(s).

INSTRUMENT PANEL
1998 Mitsubishi Montero
1998 ACCESSORIES & EQUIPMENT
Mitsubishi - Instrument Panels
Eclipse, Galant, Mirage, Montero, Montero Sport, 3000GT
DESCRIPTION & OPERATION
WARNING: Deactivate air bag system before performing any service
operation. See AIR BAG RESTRAINT SYSTEMS article. Do not
apply electrical power to any component on steering column
without first deactivating air bag system. Air bag may
deploy.
Instrument cluster includes speedometer, fuel gauge and
temperature gauge. Fuel gauge has a built-in voltage limiter to keep
voltage supply to gauges at 7 volts. Some models may also have an
ammeter, oil pressure gauge, tachometer, voltmeter and/or turbo boost
pressure gauge. Oil pressure gauge uses full battery voltage.
Tachometer operates by pulse feed.
COMPONENT LOCATIONS
COMPONENT LOCATIONS TABLE








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Component Location
Engine Coolant Temperature (ECT) Sensor
Eclipse, Galant, Montero
& Montero Sport ................. On Thermostat Housing
Mirage ........................ On Rear Of Cylinder Head
3000GT ........... On Cylinder Head, Below Ignition Coil
Input Speed Sensor
Eclipse ........................... On Side Of Transaxle
Output Speed Sensor
Eclipse ........................... On Side Of Transaxle
Vehicle Speed Sensor
Eclipse, Galant,
Mirage & 3000GT ................... On Top Of Transaxle
Montero & Montero Sport ...... On Transmission Tailshaft









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TROUBLE SHOOTING
FUEL/TEMPERATURE GAUGE NOT WORKING
Check for blown fuse, faulty voltage limiter and faulty
relay. Ensure sending unit connections are clean and tight. Test
sending unit for correct operation. Tighten connections in instrument
cluster.
SPEEDOMETER NOT WORKING
On mechanical-type speedometers, ensure speedometer cable is
properly connected and correctly routed. If speedometer pointer and/or
odometer still do not work, replace speedometer cable or speedometer
assembly.
On electric-type speedometers, check for faulty vehicle speed
sensor, input/output sensors or faulty circuit. For testing, see

Eclipse 2.0L Non-Turbo With A/T
Disconnect sensor harness connector. Check resistance between
sensor terminals. Resistance should be 300-1200 ohms. Replace sensor
as necessary.
OIL PRESSURE GAUGE
Circuit Test (Eclipse, Montero & 3000GT)
1) Disconnect oil pressure gauge wiring connector from
sending unit inside engine compartment. Connect a 12-volt test light
between harness connector terminal and ground. Turn ignition on, but
DO NOT start engine.
2) If test light comes on and gauge needle moves, go to GAUGE
RESISTANCE TEST. If test light does not come on and gauge needle does
not move, repair wiring to sending unit.
Gauge Resistance Test (Eclipse, Montero & 3000GT)
1) Remove instrument cluster from instrument panel. See
INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. On 3000GT, remove air
distribution duct and combination gauges.
2) On all models, check continuity between oil pressure gauge
terminals. See Fig. 17, 18 or 19. See
OIL PRESSURE GAUGE RESISTANCE SPECIFICATIONS table. If resistance is
not within specification, replace oil pressure gauge.
OIL PRESSURE GAUGE RESISTANCE SPECIFICATIONS TABLE









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Application Ohms
Eclipse & 3000GT ................................... 40-44
Montero ............................................... 50









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Fig. 17: Oil Pressure Gauge Resistance Test Terminals (Eclipse)
Courtesy of Mitsubishi Motor Sales of America

unit. Turn ignition on. Check voltage between ground and sending unit
harness-side connector. If battery voltage is present, problem is
intermittent. If battery voltage is not present, go to next step.
2) Check sending unit harness connector. Repair as necessary.
If connector is okay, check circuit (Yellow wire) between oil pressure\
gauge and oil pressure sending unit. See WIRING DIAGRAMS. Repair as
necessary. If circuit is okay, go to next step.
3) Remove multi-meter assembly. Check voltage between ground
and harness-side connector terminal No. 10 (Red/Black wire). See
WIRING DIAGRAMS . If battery voltage is present, problem is
intermittent. If battery voltage is not present, go to next step.
4) Check harness connector to multi-meter assembly. Repair as
necessary. If connector is okay, check circuit between multi-meter
harness connector and fusible link No. 6. See WIRING DIAGRAMS. Repair
as necessary. If circuit is okay, go to next step.
5) Turn ignition on. Check voltage between ground and multi-
meter harness-side connector terminal No. 11 (Black/White wire). See
WIRING DIAGRAMS . If battery voltage is present, problem is
intermittent. If battery voltage is not present, go to next step.
6) Check harness connector to multi-meter assembly. Repair as
necessary. If connector is okay, check circuit between multi-meter
assembly harness connector and ignition switch. See WIRING DIAGRAMS.
Repair as necessary. If circuit is okay, go to next step.
7) Turn ignition off. Check continuity between ground and
multi-meter assembly harness-side connector terminal No. 3 (Black
wire). If continuity is present, problem is intermittent. If
continuity is not present, go to next step.
8) Check harness connector to multi-meter assembly. Repair as
necessary. If connector is okay, check circuit (Black wire) between
multi-meter assembly harness connector and ground. See WIRING DIAGRAMS
. Repair as necessary. If circuit is okay, problem is intermittent.
Gauge Sending Unit Resistance Test (Montero Sport)
Disconnect harness connector to oil pressure sending unit.
Start and idle engine. Check resistance between oil pressure gauge
sending unit terminal and engine block. Resistance should be about 2
ohms. Replace sending unit if resistance is not as specified.
REED SWITCH
Continuity Check (Montero)
1) Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Check continuity between reed switch terminals
No. 1 and 2. See Fig. 20.
2) Ensure continuity pulses on and off 4 times per revolution
of speedometer shaft connection. If continuity is not as specified,
replace reed switch.
Fig. 20: Identifying Reed Switch Test Terminals (Montero)
Courtesy of Mitsubishi Motor Sales of America
SPEEDOMETER TEST

present, go to next step.
5) Check harness connectors to vehicle speed sensor and
ignition switch. See WIRING DIAGRAMS. Repair as necessary. If
connectors are okay, check circuit between vehicle speed sensor and
ignition switch. Repair as necessary. If circuit is okay, go to next
step.
6) Turn ignition off. Check resistance between ground and
vehicle speed sensor harness-side connector terminal No. 2 (Black
wire). See WIRING DIAGRAMS . Continuity should be present. If
continuity is present, problem is intermittent. If continuity is not
present, check circuit between sensor harness-side connector terminal
No. 2 and ground. Repair as necessary. If circuit is okay, go to next
step.
7) Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Check voltage between ground and instrument
cluster harness-side connector terminal No. 53 (Red/Black wire). See
WIRING DIAGRAMS . Battery voltage should be present. If battery voltage
is present, go to step 9). If battery voltage is not present, go to
next step.
8) Check harness connector to instrument cluster. Repair as
necessary. If connector is okay, check circuit between instrument
cluster harness connector and fusible link No. 6. See WIRING DIAGRAMS.
Repair as necessary. If circuit is okay, go to next step.
9) Check voltage between ground and instrument cluster
harness-side connector terminal No. 24 (Black/White wire). See
WIRING DIAGRAMS . Battery voltage should be present. If battery voltage
is present, problem is intermittent. If battery voltage is not
present, check harness connector. Repair as necessary.
TACHOMETER
NOTE: DO NOT reverse polarity when installing tachometer, or diode
and transistor may be damaged.
Calibration Test
Connect a calibrated, reliable tachometer to vehicle ignition
system. Operate engine at various speeds (RPM). See
TACHOMETER ALLOWABLE VARIATION table. If comparison between tach-dwell
meter and vehicle tachometer readings are not within permissible
variation, replace vehicle tachometer.
TACHOMETER ALLOWABLE VARIATION TABLE









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Application &
Engine Speed (RPM) Allowable Variation (RPM)
Eclipse, Galant & 3000GT
1000 .......................................... 900-1100
3000 ......................................... 2850-3150
5000 ......................................... 4750-5250
6000 ......................................... 5700-6300
Mirage, Montero & Montero Sport
700 ............................................ 600-800
3000 ......................................... 2850-3150
5000 ......................................... 4750-5250
6000 ......................................... 5700-6300









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NOTE: Circuit test for Eclipse, Galant, Montero and 3000GT is not
available from manufacturer at time of publication.
Circuit Test (Mirage)
1) Disconnect instrument cluster harness connector. Check

voltage between ground and harness-side connector terminal No. 33
(White wire). See WIRING DIAGRAMS. Voltmeter should read 5 volts. If
voltage is as specified, replace tachometer. If voltage is not as
specified, go to step 4).
2) Check continuity between ground and instrument cluster
harness-side connector terminal No. 34 (Black wire). See
WIRING DIAGRAMS . If continuity is present, replace tachometer. If
continuity is not present, go to step 5).
3) Check voltage between ground and instrument cluster
harness-side connector terminal No. 42 (Black/White wire). See
WIRING DIAGRAMS . Battery voltage should be present. If battery voltage
is present, replace tachometer. If battery voltage is not present, go
to step 6).
4) Check harness connectors to ECM, instrument cluster or
distributor assembly (1.5L). Repair as necessary. If connectors are
okay, check circuit between ECM, instrument cluster and distributor
(1.5L). See WIRING DIAGRAMS . Repair as necessary.
5) Check joint connector to instrument cluster. Repair as
necessary. If connector is okay, check circuit between instrument
cluster and ground. See WIRING DIAGRAMS. Repair as necessary.
6) Check harness and joint connectors to power supply
junction block. Repair as necessary. If connectors are okay, check
circuit between instrument cluster and power supply. See
WIRING DIAGRAMS . Repair as necessary.
Circuit Test (Montero Sport)
1) Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Disconnect instrument cluster harness
connector. Connect voltmeter between ground and instrument cluster
harness-side connector terminal No. 14 (White wire). Start and idle
engine. Voltmeter should read about 5 volts. If voltage is as
specified, problem is intermittent. If voltage is not as specified, go
to next step.
2) Check instrument cluster harness connector. Repair as
necessary. If connector is okay, go to next step on 2.4L engines or
step 7) on 3.0L engines.
3) Check noise filter harness connector (located behind
instrument cluster). Repair as necessary. If connector is okay, go to
next step.
4) Check circuit between instrument cluster harness connector
and noise filter connector. See WIRING DIAGRAMS. Repair as necessary.
If circuit is okay, go to next step.
5) Remove noise filter (located near throttle position sensor\
harness). Check resistance between noise filter terminals. Resistance
should be 1760-2640 ohms. If resistance is not as specified, replace
noise filter. If resistance is as specified, go to next step.
6) Check joint connector behind right side of dash. Repair as
necessary. If connector is okay, check circuit between joint connector
and instrument cluster harness connector. See WIRING DIAGRAMS. Repair
as necessary. If circuit is okay, go to next step.
7) Check voltage between ground and instrument cluster
harness-side connector terminal No. 24 (Black/White wire). If battery
voltage is present, problem is intermittent. If battery voltage is not
present, go to next step.
8) Check harness connector to instrument cluster. Repair as
necessary. If connector is okay, check circuit between instrument
cluster and ignition switch. See WIRING DIAGRAMS. Repair as necessary.
If circuit is okay, go to next step.
9) Check circuit between ground and instrument cluster
harness-side connector terminal No. 13 (Black wire). If continuity is
present, problem is intermittent. If continuity is not present, check
harness connector to instrument cluster and to chassis ground. See
WIRING DIAGRAMS . Repair as necessary. If connectors are okay, replace

speedometer.
TEMPERATURE GAUGE
CAUTION: DO NOT connect sender wire directly to ground during test.
Circuit Test
1) Disconnect temperature sender wire from sending unit.
Connect a 12-volt, 3.4-watt test light between connector terminal and
ground. Turn ignition switch to ON position.
2) If test light flashes and temperature gauge needle moves,
go to SENSOR RESISTANCE TEST. If test light does not flash or gauge
needle does not move, repair wiring to sending unit.
Sensor Resistance Test
1) Remove Engine Coolant Temperature (ECT) sensor from
engine. See COMPONENT LOCATIONS . Place sending unit in 158
F (70C)
water. Check sensor resistance using ohmmeter.
2) ECT sensor resistance should be 90-117 ohms. If ECT sensor
resistance is okay, go to GAUGE RESISTANCE TEST. Replace ECT sensor if
resistance is not as specified.
Gauge Resistance Test
1) Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. On 3000GT, remove air distribution duct and
combination gauges.
2) On all models, check resistance between temperature gauge
terminals at rear of cluster or combination gauges. See
TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS table. See Fig. 21, 22,
23, 24, 25, 26, 27 or 28.
TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS TABLE









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Application ( 1) Terminals Ohms
Eclipse ............... "A" & "B" .............. 161-197
Eclipse ............... "A" & "C" ................ 51-57
Eclipse ............... "B" & "C" .............. 210-256
Galant ................ "B" & "C" .................. ( 2)
Mirage ................ "A" & "B" ................ 86-95
Mirage ................ "A" & "C" .............. 168-206
Mirage ................ "B" & "C" .............. 222-272
Montero ............... No. 4 & 8 .............. 103-128
Montero ............... No. 4 & 9 .............. 221-271
Montero ............... No. 8 & 9 .............. 130-160
Montero Sport ......... "A" & "B" ................... 88
Montero Sport ......... "A" & "C" .................. 103
Montero Sport ......... "B" & "C" .................. 191
3000GT ................ "A" & "B" ................... 51
3000GT ................ "A" & "C" .................. 139
3000GT ................ "B" & "C" .................. 190
( 1) - See Fig. 21, 22, 23, 24, 25, 26, 27 or 28.
( 2) - With positive battery voltage applied to terminal "A",
battery ground applied to terminal "C" and a 50-ohm
resistor connected between battery ground and terminal
"B", needle should be about 1/4 position on gauge.









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Resistance Test (Montero Only)
Using an ohmmeter, check resistance between voltmeter
terminals. See Fig. 30. Resistance should be 380-460 ohms.
Fig. 30: Identifying Voltmeter Resistance Test Terminals (Montero)
Courtesy of Mitsubishi Motor Sales of America
Voltage Test (3000GT Only)
Start engine, and let it idle. Connect voltmeter to battery.
Compare voltage reading of test voltmeter to voltage reading of
vehicle voltmeter. Voltage variation should not exceed 0.5 volt (plus
or minus). Replace instrument cluster voltmeter if voltage reading is
not as specified.
FOGLIGHT SWITCH TEST
NOTE: Montero Sport is not equipped with foglights.
Eclipse
Remove foglight switch from instrument panel. Disconnect
switch connector. Using an ohmmeter, check switch continuity. With
switch in OFF position, continuity should exist between terminals No.
1 and 3. With switch in ON position, continuity should exist between
terminals No. 1 and 3, and between terminals No. 4 and 5. See Fig. 31.
If continuity is not as specified, replace switch.
Galant & Mirage
Remove foglight switch from instrument panel. Disconnect
switch connector. Using an ohmmeter, check switch continuity. With
switch in OFF position, continuity should exist between terminals No.
1 and 2. With switch in ON position, continuity should exist between
terminals No. 1 and 2, terminals No. 3 and 4, and terminals No. 5 and
6. See Fig. 31. If continuity is not as specified, replace switch.