1991 MITSUBISHI MONTERO coolant

\003
K - S EN SO R R AN G E C HAR TS

1991 M it s u bis h i M onte ro
1991 ENGINE PERFORMANCE
Sensor Operating Range Charts
Chrysler Motors: Colt, Colt 200, Colt Vista,
Ram-50, Stealth, Summit,
Mitsubishi: Eclipse, Galant, Mirage, Montero,
Pickup, 3000GT
INTRODUCTION
Sensor operating range information can help determine if a
sensor is out of calibration. An out-of-calibration sensor may not set
a trouble code, but it may cause driveability problems.
SENSOR OPERATING RANGE CHARTS
NOTE: Unless stated otherwise in test procedure, perform all
voltage tests using a Digital Volt-Ohmmeter (DVOM) with a
minimum 10-megohm input impedance. For connector and
terminal identification, see L - WIRING DIAGRAMS article in
the ENGINE PERFORMANCE Section.
COOLANT TEMP SENSOR RESISTANCE TABLE ( 1)









\









\









\









\









Temperature F (C) Ohms
Galant, Montero 3.0L, & Pickup 3.0L
32 (0) ............................. 5900
68 (20) ............................ 2500
104 (40) ........................... 2700
176 (80) ............................ 300
All Others
32 (0) ............................. 5900
68 (20) ............................ 2500
104 (40) ........................... 1100
176 (80) ............................ 300
( 1) - Measure resistance across disconnected
sensor terminals.









\









\









\









\









EGR TEMP SENSOR RESISTANCE TABLE ( 1) ( 2)








\









\









\









\









Temperature F (C) Ohms
122 (50) ............................ 60-83
212 (100) .......................... 11-14
( 1) - Measure resistance across disconnected
sensor terminals.
( 2) - Specifications apply to all models
except Montero.









\









\









\









\









INTAKE AIR TEMP SENSOR RESISTANCE TABLE ( 1)








\









\









\









\









Temperature F (C) Ohms
32 (0) ............................... 6000

Power Steering (Dexron-II)
Colt, Colt Vista, Colt 200, Mirage & Summit ...... 1.9 Qts. (.9L)\
Eclipse & Galant .................................. 1.9 Qts. (.9L)\
Montero .......................................... 2.2 Pts. (1.0L)\
Pickup & Ram-50 ................................... 1.9 Qts. (.9L)\
Stealth & 3000GT
2-Wheel Steering ................................ 1.9 Pts. (.9L)\
4-Wheel Steering ............................... 2.5 Pts. (1.2L)\
Transfer Case (SAE 75W-85/API GL-4)
Colt Vista ........................................ 1.5 Pts. (.7L)\
Eclipse & Galant .................................. 1.3 Pts. (.6L)\
Montero, Pickup & Ram-50 ......................... 4.7 Pts. (2.2L)\
Stealth ............................................. .3 Pt. (.2L)\
3000GT .............................................. .6 Pt. (.3L)\
(1) - Add 1.0 Pt. (.5L) with oil cooler.









\









\









\









\









\









\









\







QUICK-SERVICE
SERVICE INTERVALS & SPECIFICATIONS
REPLACEMENT INTERVALS








\









\









\









\









Component Miles
Colt, Colt 200, Mirage & Summit
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Oil Filter ....................... 15,000
Spark Plugs ...................... 30,000
Timing Belt ...................... 60,000
Colt Vista
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
EGR Valve ( 1) .................... 50,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Oil Filter ....................... 15,000
O2 Sensor ( 1) .................... 80,000
Rear Axle Fluid .................. 30,000
Spark Plugs ...................... 30,000
Spark Plug Wires ( 1) ............. 60,000
Timing Belt ...................... 60,000
Vapor Canister ( 1) .............. 100,000
Mirage
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Filter ........................... 15,000
Spark Plugs ...................... 30,000
Timing Belt ...................... 60,000
Eclipse

Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil
Non-Turbo ........................ 7500
Turbo ............................ 5000
Oil Filter
Non-Turbo ...................... 15,000
Turbo .......................... 10,000
Spark Plugs ...................... 30,000
Timing Belt ...................... 60,000
Galant
Air Filter ....................... 30,000
Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil
Non-Turbo ........................ 7500
Turbo ............................ 5000
Oil Filter
Non-Turbo ...................... 15,000
Turbo .......................... 10,000
Rear Axle Fluid .................. 30,000
Spark Plugs ...................... 30,000
Timing & Balance Shaft Belts ..... 60,000
Montero
Air Filter ....................... 30,000
Automatic Transmission Fluid ..... 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Front & Rear Axle Fluid .......... 30,000
Fuel Filter ...................... 50,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Oil Filter ....................... 15,000
O2 Sensor (2) .................... 80,000
Spark Plugs ...................... 30,000
Spark Plug Wires ( 2) ............. 60,000
Timing Belt ...................... 60,000
Transfer Case Fluid .............. 30,000
Vapor Canister ( 2) .............. 100,000
Pickup & Ram-50
Air Filter ....................... 30,000
Automatic Transmission Fluid ..... 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
EGR Valve (2.4L) ( 2) ............. 50,000
Front & Rear Axle Fluid .......... 30,000
Fuel Filter ...................... 50,000
Fuel & Vapor Hoses ............... 50,000
Oil ................................ 7500
Oil Filter ....................... 15,000
O2 Sensor ( 2) .................... 80,000
Spark Plugs ...................... 30,000
Spark Plug Wires ( 2) ............. 60,000
Timing Belt ...................... 60,000
Transfer Case Fluid .............. 30,000
Vapor Canister ( 2) .............. 100,000
Stealth
Air Filter ....................... 30,000

Automatic Transaxle Fluid ........ 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Front & Rear Axle Fluid .......... 30,000
Fuel & Vapor Hoses ............... 50,000
Oil
Non-Turbo ........................ 7500
Turbo ............................ 5000
Oil Filter
Non-Turbo ...................... 15,000
Turbo .......................... 10,000
Spark Plugs ...................... 60,000
Timing Belt ...................... 60,000
3000GT
Air Filter ....................... 30,000
Belts ............................ 30,000
Coolant .......................... 30,000
Fuel & Vapor Hoses ............... 50,000
Front & Rear Axle Fluid .......... 30,000
Oil
Non-Turbo ........................ 7500
Turbo ............................ 5000
Oil Filter
Non-Turbo ...................... 15,000
Turbo .......................... 10,000
Spark Plugs ...................... 60,000
Timing Belt ...................... 60,000
(1) - Federal 4WD models only.
( 2) - Federal models only.









\









\









\









\









BELT ADJUSTMENT








\









\









\









\









\









\









\


Deflection
Application ( 1) In. (mm)
Colt, Colt 200, Mirage & Summit
1.5L ...................................... .28-.35 (7.1-8.9)
1.6L ..................................... .35-.45 (8.9-11.4)
Colt Vista
2.0L ..................................... .28-.40 (7.1-10.2)
Eclipse
1.8L ..................................... .32-.43 (8.1-11.1)
2.0L ..................................... .35-.45 (8.9-11.4)
Galant
Alternator Belt .......................... .35-.45 (8.9-11.4)
A/C Belt .......................................... .32 (8.1)
Power Steering Belt ....................... .24-.35 (6.1-8.9)
Montero
3.0L ...................................... .20-.24 (5.1-6.1)
Pickup & Ram-50
2.4L ...................................... .27-.39 (6.8-9.9)
3.0L ...................................... .32-.39 (8.1-9.9)
Stealth & 3000GT
SOHC
Alternator & Power Steering Belt ........ .24-.35 (6.1-8.9)
A/C Belt ................................ .28-.37 (7.1-9.5)
DOHC
Alternator Belt (With or Without A/C) ... .16-.22 (4.1-5.6)
Power Steering Belt .................... .35-.43 (8.9-11.1)
( 1) - With 22 lbs. (10 kg) pressure applied midway on belt run.

\003
I - S YSTE M /C O M PO NEN T T E STS

1991 M it s u bis h i M onte ro
1991 ENGINE PERFORMANCE
System & Component Testing
Chrysler Motors: Ram-50
Mitsubishi: Montero, Pickup
INTRODUCTION
Before testing separate components or systems, perform
procedures in F - BASIC TESTING article in the ENGINE PERFORMANCE
Section. Since many computer controlled and monitored components set a
trouble code if they malfunction, also perform procedures in G - TESTS
W/CODES article in the ENGINE PERFORMANCE Section.
NOTE: Testing individual components does not isolate shorts or
opens. Perform all voltage tests with a Digital
Volt-Ohmmeter (DVOM) with a minimum 10-megohm input
impedance, unless stated otherwise in test procedure. Use
ohmmeter to isolate wiring harness shorts or opens.
COMPUTERIZED ENGINE CONTROLS
CONTROL UNIT
NOTE: To identify ECU power and ground circuits, see appropriate
L - WIRING DIAGRAMS article in the ENGINE PERFORMANCE
Section.
Ground Circuits
1) ECU is located near right kick panel. Turn ignition off.
Using an ohmmeter, check for continuity between ground and ECU
terminals No. 101 and 106. Resistance should be zero ohms. If
resistance is not zero ohms, repair open circuit between ECU connector
and ground.
2) Connect voltmeter negative lead to ground. Connect
positive lead to ECU ground terminals as in step 1). With vehicle
running, voltmeter should indicate less than one volt. If voltmeter
reading is greater than one volt, check for open, corrosion or loose
connection in ground circuit.
Power Circuits
ECU is located near right kick panel. Turn ignition on. Check
for battery voltage on ECU terminals No. 102 and 107. If battery
voltage is not present, check operation of MPI control relay. See
RELAYS under MOTORS, RELAYS & SOLENOIDS.
ENGINE SENSORS & SWITCHES
BAROMETRIC PRESSURE SENSOR
Sensor is a component part of airflow sensor assembly. See G
- TESTS W/CODES article in the ENGINE PERFORMANCE Section.
COOLANT TEMPERATURE SENSOR
1) Remove coolant temperature sensor located near thermostat
housing (2-wire connector). Place end of sensor in water with terminal\

connector portion of sensor slightly above water.
2) Gradually heat water and read resistance values across
terminal connectors. See COOLANT TEMPERATURE SENSOR RESISTANCE table.
If resistance is not within specification, replace sensor.
COOLANT TEMPERATURE SENSOR RESISTANCE TABLE









\









\









\









\









TemperatureF (C) Ohms
Montero & Pickup 3.0L
32 (0) ............................. 5900
68 (20) ............................ 2500
104 (40) ........................... 2700
176 (80) ............................ 300
All Others
32 (0) ............................. 5900
68 (20) ............................ 2500
104 (40) ........................... 1100
176 (80) ............................ 300









\









\









\









\









CRANK ANGLE SENSOR
See IGNITION SYSTEM.
DETONATION SENSOR
See IGNITION SYSTEM.
EGR TEMPERATURE SENSOR
California
See EXHAUST GAS RECIRCULATION (EGR) under EMISSION SYSTEMS &
SUB-SYSTEMS.
IDLE POSITION SWITCH
NOTE: Idle position switch is incorporated in idle speed control
motor assembly, motor position sensor or throttle position
sensor, depending upon vehicle application.
Pickup 2.4L & Ram-50 2.4L
1) Disconnect motor position sensor (MPS) connector. Connect\
ohmmeter lead between ground and MPS connector terminal No. 4. See
Fig. 2 .
2) With accelerator pedal pressed, no continuity should be
present. With accelerator pedal released, continuity should be
present. If switch continuity is not as specified, replace MPS.
Montero, Pickup 3.0L & Ram-50 3.0L
1) Disconnect throttle position sensor (TPS) connector.
Connect ohmmeter between TPS connector terminals No. 1 and 2. See
Fig. 6 .
2) With accelerator pedal pressed, no continuity should be
present. With accelerator pedal released, continuity should be
present. If idle switch continuity is not as specified, replace TPS.
INHIBITOR SWITCH
Automatic Transmission
Switch is mounted to automatic transaxle, near shift lever

specified range, replace MPS.
CAUTION: DO NOT apply more than 6 volts to ISC motor.
3) Operate ISC motor by connecting a 6-volt source directly
to appropriate terminals of ISC motor connector. For ISC motor
operation test procedures, see IDLE SPEED CONTROL (ISC) MOTOR
OPERATION TEST under IDLE CONTROL SYSTEM.
4) While operating ISC motor, measure resistance between MPS
connector terminals No. 3 and 5. Observe ohmmeter during ISC motor
operation. If MPS resistance does not vary within a 4000-6000 ohm
range or if resistance does not change smoothly, replace MPS (vehicles
equipped with separate MPS) or ISC motor assembly (vehicles equipped
with MPS incorporated in ISC).
OXYGEN SENSOR
1-Wire Or 2-Wire
1) On all models, warm engine until coolant temperature is
185-205
F (85-96C). Disconnect oxygen sensor connector. See Fig. 3 or
4.
2) Connect digital voltmeter between terminal No. 1 and
ground. Repeatedly race engine and observe oxygen sensor output
voltage. If output is not 0.6-1.0 volt, replace oxygen sensor.
Fig. 3: O2 Sensor Connector Terminal ID (1 Wire)
Courtesy of Mitsubishi Motor Sales of America.

Fig. 4: O2 Sensor Connector Terminal ID (2 Wire)
Courtesy of Mitsubishi Motor Sales of America.
4-Wire Heated
1) Warm engine until coolant temperature is 185-205
F (85-