open MITSUBISHI MONTERO 1998 User Guide
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Page 88 of 1501
With A/C switch in indicated position, ensure continuity
exists between listed terminals. See appropriate A/C SWITCH CONTINUITY
TEST table. See Fig. 2.
A/C SWITCH CONTINUITY TEST TABLE
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Switch Position Terminal No. Continuity
OFF ...................... ( 1) ...................... No
ECONO ................... 1 & 3 .................... Yes
A/C ................... 1, 3 & 4 ................... Yes
( 1) - Continuity should not exist between any terminals.
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Fig. 2: Identifying A/C Switch Terminals
Courtesy of Mitsubishi Motor Sales of America.
A/C ENGINE COOLANT TEMPERATURE SWITCH
1) Disconnect A/C engine coolant temperature switch
connector. Remove A/C engine coolant temperature switch. Carefully
heat a pan of oil and hold coolant temperature switch up to threads in
oil. Coolant switch is normally closed (continuity exists).
2) When oil reaches 235-243
F (112-118C), coolant switch
should open (no continuity). Replace A/C engine coolant temperature
switch if it does not test as specified. See Fig. 3.
Page 101 of 1501
A/C SYSTEM GENERAL SERVICING
1998 Mitsubishi Montero
1998 AIR CONDITIONING & HEAT
Mitsubishi - A/C System General Servicing
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport &
3000GT
A/C COMPRESSOR APPLICATIONS
A/C COMPRESSOR APPLICATION TABLE \
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Application Compressor
Diamante ......................... Sanden MSC105CVS Scroll
Eclipse
2.0L Non-Turbo ............. Nippondenso 10PA17C 10-Cyl.
2.0L Turbo & 2.4L .............. Sanden MSC105CVS Scroll
Galant ............................ Sanden MSC90C12 Scroll
Mirage ............................... Sanden MSC90 Scroll
Montero ....................... Nippondenso 10PA15 10-Cyl.
Montero Sport ...................... Sanden MSC105C Scroll
3000GT .............................. Sanden MSC105 Scroll
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USING R-12 & R-134a REFRIGERANT
HANDLING/SAFETY PRECAUTIONS
1) Always work in a well-ventilated, clean area. Avoid
breathing refrigerant vapors. Exposure may irritate eyes, nose and
throat. Refrigerant is colorless and is invisible as a gas.
Refrigerant is heavier than oxygen and will displace oxygen in a
confined area.
2) A/C system high pressure can cause severe injury to eyes
and skin if a hose were to burst. Always wear eye protection, gloves
and other protective clothing when working around A/C system and
refrigerant.
3) Refrigerant evaporates quickly when exposed to atmosphere,
freezing anything it contacts. If liquid refrigerant contacts eyes or
skin (frostbite), DO NOT rub eyes or skin. Immediately flush affected
area with cool water for 15 minutes and consult a doctor or hospital.
4) Never use R-134a in combination with compressed air for
leak testing. Pressurized R-134a in the presence of oxygen (air
concentrations greater than 60 percent by volume) may form a
combustible mixture. DO NOT introduce compressed air into R-134a
containers (full or empty), A/C system components or service
equipment.
5) DO NOT expose A/C system components to high temperatures,
steam cleaning for example, as excessive heat will cause
refrigerant/system pressure to increase. Never expose refrigerant
directly to open flame. If refrigerant needs to be warmed, place
bottom of refrigerant tank in warm water. Water temperature MUST NOT
exceed 125
F (52C).
CAUTION: When R-134a is exposed to an open flame, drawn into engine,
or detected with a Halide (propane) leak tester, a poisonous
gas is formed. Keep work areas well ventilated.
6) Use care when handling refrigerant containers. DO NOT
drop, strike, puncture or incinerate containers. Use Department Of
Page 105 of 1501
Schrader valve is similar in construction and operation to a
tire valve. When a test gauge hose with built-in valve core depressor
is attached, Schrader stem is pushed inward to the open position and
allows system pressure to reach gauge.
If test hose does not have a built-in core depressor, an
adapter must be used. Never attach hose or adapter to Schrader valve
unless it is first connected to manifold gauge set.
Refrigerant R-12 Schrader-type valve cores have TV5 thread
size. Refrigerant R-134a Schrader-type valve cores use M6 (Metric)
threads. See Fig. 1.
SERVICE VALVE LOCATIONS
SERVICE VALVE LOCATIONS TABLE \
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Vehicle High Low
Diamante ...................... ( 1) ................ ( 2)
Eclipse ....................... ( 1) ................ ( 2)
Galant ........................ ( 1) ................ ( 2)
Mirage ........................ ( 1) ................ ( 2)
Montero ....................... ( 3) ................ ( 3)
Montero Sport ................. ( 1) ................ ( 2)
3000GT ........................ ( 4) ................ ( 2)
( 1) - On high pressure line, between accumulator/receiver-
drier and evaporator.
( 2) - On low pressure line, between evaporator and
compressor.
( 3) - On top of accumulator/receiver-drier.
( 4) - On high pressure line, near receiver-drier.
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REFRIGERANT RECOVERY/RECYCLING
Refrigerant recovery/recycling equipment is used to remove
refrigerant from vehicle's A/C system without polluting atmosphere. To
remove and recycle refrigerant, connect the recovery/recycling
equipment and following the equipment manufacturer's instructions.
Removed refrigerant is filtered, dried and stored in a tank
within the recovery/recycling equipment until it is ready to be pumped
back into vehicle A/C system. With refrigerant stored in the
recovery/recycling equipment, A/C system can be opened without
polluting atmosphere.
NOTE: Separate sets of hoses, gauges and refrigerant
recovery/recycling equipment MUST be used for R-12 and
R-134a based systems. DO NOT mix R-12 and R-134a
refrigerants, as their refrigerant oils and desiccants are
not compatible. It is NOT possible to clean equipment
thoroughly enough to prevent cross-contamination of A/C
systems. On systems with R-134a refrigerant, use
Polyalkylene Glycol (PAG) wax-free refrigerant oil.
Page 110 of 1501
Tool Name Tool Number
For Component Replacement
Steering Wheel Puller ......................... MB990803
For Testing SRS
Digital Volt-Ohm Meter (DVOM) ...................... (1)
Multi-Use Tester II ........................... MB991502
ROM Pack ........................................... ( 2)
SRS Check Harness ............................. MB991613
For Deploying Air Bags
SRS Air Bag Adapter Harness "A" ( 3) ........... MB686560
SRS Air Bag Adapter Harness "B" ( 4) ........... MB628919
( 1) - Maximum current output of DVOM must not exceed 2 mA
(milliamps) when set on minimum range of resistance
measurement.
( 2) - ROM pack is used with multi-use tester.
( 3) - For on-vehicle deployment of driver-side air bag. For
on-vehicle or off-vehicle deployment of passenger-side
air bag.
( 4) - For off-vehicle deployment of driver-side air bag.
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DISABLING & ACTIVATING AIR BAG SYSTEM
WARNING: SRS system voltage is maintained for about 60 seconds after
battery cable is disconnected. After disconnecting battery
cable, wait at least 60 seconds before servicing SRS.
Failure to wait may cause accidental air bag deployment and
possible personal injury.
To disable system, turn ignition switch to LOCK position.
Disconnect negative battery cable. Shield cable end. Wait at least 60
seconds before servicing. To activate system, reconnect negative
battery cable.
DISPOSAL PROCEDURES
WARNING: Undeployed air bag must be deployed before disposal.
Disposing of an undeployed air bag may violate federal,
state and/or local laws. This also applies to vehicles that
are to be scrapped. Never sell a used air bag module.
UNDEPLOYED AIR BAG
WARNING: Deploy air bag outdoors and away from people. Air bag
deployment makes a loud noise. NEVER deploy air bag module
with trim cover face down.
NOTE: If replacing a deployed air bag, both front impact sensors
and SRS-ECU must also be replaced. If vehicle is to be
scrapped, perform PROCEDURE 1 (ON-VEHICLE DEPLOYMENT) below.
If vehicle will continue to be operated, perform PROCEDURE 2
(OFF-VEHICLE DEPLOYMENT) below.
Procedure 1 (On-Vehicle Deployment)
1) Before proceeding, follow air bag service precautions. See
SERVICE PRECAUTIONS . Open all doors and windows. Move vehicle to an
isolated area. Disconnect negative battery cable and wrap tape around
cable terminal.
2) Disconnect positive battery cable. Remove battery. Wait at
Page 127 of 1501
ANTI-LOCK BRAKE SAFETY PRECAUTIONS
1998 Mitsubishi Montero
GENERAL INFORMATION
Anti-Lock Brake Safety Precautions
* PLEASE READ THIS FIRST *
This article is intended for general information purposes
only. This information may not apply to all makes and models. If
vehicle is equipped with Anti-Lock Brake System (ABS), refer to
appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section for
description, operation, depressurizing, testing, system bleeding,
trouble shooting and servicing of specific system.
WARNING: Failure to depressurize ABS could lead to physical injury.
ANTI-LOCK BRAKE SAFETY PRECAUTIONS
WARNING: Failure to depressurize ABS could lead to physical injury.
* NEVER open a bleeder valve or loosen a hydraulic line
while ABS is pressurized.
* NEVER disconnect or reconnect any electrical connectors
while ignition is on. Damage to ABS control unit may result.
* DO NOT attempt to bleed hyudarulic system without first
referring to the appropriate ANTI-LOCK BRAKE SYSTEM article
in the BRAKES section.
* Only use specially designed brake hoses/lines on ABS equipped
vehicles.
* DO NOT tap on speed sensor components (sensor, sensor rings).
Sensor rings must be pressed into hubs, NOT hammered into
hubs. Striking these components can cause demagnetization or
a loss of polarization, affecting the accuracy of the speed
signal returning to the ABS control unit.
* DO NOT mix tire sizes. Increasing the width, as long as tires
remain close to the original diameter, is acceptable. Rolling
diameter must be identical for all 4 tires. Some
manufacturers recommend tires of the same brand, style and
type. Failure to follow this precaution may cause inaccurate
wheel speed readings.
* DO NOT contaminate speed sensor components with grease. Only
use recommended coating, when system calls for an
anti-corrosion coating.
* When speed sensor components have been removed, ALWAYS check
sensor-to-ring air gaps when applicable. These specifications
can be found in each appropriate article.
* ONLY use rocommended brake fluids. DO NOT use silicone brake
fluids in an ABS equipped vehicle.
* When instlling transmittion devices (CB's, telephones, etc.)
on ABS equipped vehicles, DO NOT locate the antenna near the
ABS control unit (or any control unit).
* Disconnect all on-board computers, when using electric
welding equipment.
* DO NOT expose the ABS control unit to prolonged periods of
high heat (185
F/85 C for 2 hours is generally considered a
maximum limit).
Page 135 of 1501
Fig. 8: Identifying Data Link Connector Terminals
Courtesy of Mitsubishi Motor Sales of America.
CLEARING DTCs
To clear DTCs using scan tool, follow scan tool
manufacturer's instructions. To clear DTCs without scan tool,
disconnect negative battery cable for at least 10 seconds. Reconnect
battery cable and repeat RETRIEVING DTCs to confirm that malfunction
has been corrected.
DTC DEFINITION
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DTC ( 1) System Affected
11 ..................... Right Front Wheel Speed Sensor (Open/Short)\
12 ...................... Left Front Wheel Speed Sensor (Open/Short)\
13 ...................... Right Rear Wheel Speed Sensor (Open/Short)\
14 ....................... Left Rear Wheel Speed Sensor (Open/Short)\
15 ..................... Wheel Speed Sensor Output Signal (Abnormal)\
16 ................................................ ECU Power Supply
21 ....................... Right Front Wheel Speed Sensor (Abnormal)\
22 .............................. Left Front Wheel Sensor (Abnormal)\
23 ........................ Right Rear Wheel Speed Sensor (Abnormal)\
24 ......................... Left Rear Wheel Speed Sensor (Abnormal)\
25 ........................................ Free Wheel Engage Switch
26 ....................... Center Differential Lock Detection Switch
27 ..................... ( 2) Rear Differential Lock Detection Switch
Page 136 of 1501
27 ..................... (3) Rear Differential Lock Detection Switch
32 ............................................... "G" Sensor System
33 ......................................... Stoplight Switch System
41 ....................................... RF Solenoid Valve Circuit
42 ....................................... LF Solenoid Valve Circuit
43 ..................................... Rear Solenoid Valve Circuit
51 ..................................................... Valve Relay
53 ..................................................... Motor Relay
63 Or 64 ............................................ ( 4) Faulty ECU
( 1) - See appropriate DTC under DIAGNOSTIC TESTS.
( 2) - Vehicles with differential lock.
( 3) - Vehicles without differential lock.
( 4) - Replace ECU.
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DIAGNOSTIC TESTS
DTC 11, 12, 13 OR 14: WHEEL SPEED SENSOR (OPEN/SHORT
CIRCUIT)
NOTE: DTC will set if ECU detects a wheel speed sensor open or
short circuit.
1) Ensure sensor is properly installed. See WHEEL SPEED
SENSOR (WSS) under REMOVAL & INSTALLATION . Correct installation if
needed. If installation is okay, go to next step.
2) Disconnect ECU 26-pin connector. Check resistance between
specified ECU connector terminals. See
WHEEL SPEED SENSOR OUTPUT CIRCUIT IDENTIFICATION table. See Figs. 5-6.
Resistance for front sensors should be 1170-1350 ohms. Resistance for
rear sensors should be 1300-1500 ohms. If resistance is as specified,
go to next step. If resistance is not as specified, check and repair
connectors and related wiring between ECU and suspect sensor. See
WIRING DIAGRAMS .
WHEEL SPEED SENSOR OUTPUT CIRCUIT IDENTIFICATION
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Application Terminals No.
Left Front .................................................. 7 & 20
Left Rear ................................................... 9 & 22
Right Front ................................................ 10 & 23
Right Rear .................................................. 8 & 21
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3) Raise and support vehicle. Disconnect ECU connectors.
Using DVOM, backprobe specified ECU connector terminals. See
WHEEL SPEED SENSOR OUTPUT CIRCUIT IDENTIFICATION table. See Figs. 5-6.
Check voltage between each harness connector terminal while rotating
wheel at 1/2 to one rotation per second. If pulse voltage is 70 mV or
more, go to step 8). If voltage is not as specified, go to next step.
4) Inspect condition of suspect speed sensor. Ensure tip of
speed sensor is clean. If speed sensor is okay, go to next step.
5) Disconnect sensor connector. Using DVOM, check resistance
across sensor terminals. Resistance for front sensors should be 1170-
1350 ohms. Resistance for rear sensors should be 1300-1500 ohms. If
resistance is as specified, go to next step. If resistance is not as
specified, replace sensor.
6) Remove sensor. Check resistance between each sensor
terminal and sensor body. If resistance is 100,000 ohms or more, go to
next step. If resistance is not as specified, replace sensor.
Page 137 of 1501
7) Inspect condition of toothed rotor. Check for broken or
deformed teeth. If toothed rotor is okay, go to next step.
8) Check ECU connectors. Repair connectors as needed. If
connectors are okay, replace ECU.
DTC 15: WHEEL SPEED SENSOR OUTPUT SIGNAL (ABNORMAL)
NOTE: DTC will set if ECU detects a wheel speed sensor fault other
than an open or short circuit.
1) Ensure sensor is properly installed. See WHEEL SPEED
SENSOR (WSS) under REMOVAL & INSTALLATION . Correct installation if
needed. If installation is okay, go to next step.
2) Raise and support vehicle. Disconnect ECU connectors.
Using DVOM, backprobe specified ECU connector terminals. See
WHEEL SPEED SENSOR OUTPUT CIRCUIT IDENTIFICATION table. See Figs. 5-6.
Check voltage between each harness connector terminal while rotating
wheel at 1/2 to one rotation per second. If pulse voltage is 70 mV or
more, go to step 7). If voltage is not as specified, go to next step.
3) Inspect condition of suspect speed sensor. Ensure tip of
speed sensor is clean. If speed sensor is okay, go to next step.
4) Disconnect sensor connector. Using DVOM, check resistance
across sensor terminals. Resistance for front sensors should be 1170-
1350 ohms. Resistance for rear sensors should be 1300-1500 ohms. If
resistance is as specified, go to next step. If resistance is not as
specified, replace sensor.
5) Remove sensor. Check resistance between each sensor
terminal and sensor body. If resistance is 100,000 ohms or more, go to
next step. If resistance is not as specified, replace sensor.
6) Inspect condition of toothed rotor. Check for broken or
deformed teeth. If toothed rotor is okay, go to next step.
7) Check ECU connectors. Repair connectors as needed. If
connectors are okay, replace ECU.
DTC 16: ECU POWER SUPPLY
NOTE: DTC will set if ECU power supply voltage is not within
standard value. If voltage returns to normal, DTC will be
erased. Ensure battery is fully charged.
1) Ensure battery voltage is 10-17 volts. Turn ignition off.
Disconnect ECU 26-pin connector. Start engine. Using DVOM, check
voltage between ECU 26-pin connector terminal No. 13 and ground. See
Figs. 5 -6. If battery voltage exists, go to step 3). If battery
voltage do es not exist, go to next step.
2) Check and repair connectors and related wiring between
ignition switch and ECU. See WIRING DIAGRAMS. If connectors and wiring
are okay, check and repair battery or charging system.
3) Check voltage between ECU 26-pin connector terminal No. 26
and ground. If battery voltage exists, go to next step. If battery
voltage does not exist, check and repair connectors and wiring harness
between fusible link and ECU. See WIRING DIAGRAMS.
4) Check and repair ECU connectors. If connectors are okay,
replace ECU.
DTC 21, 22, 23 OR 24: WHEEL SPEED SENSOR (ABNORMAL)
NOTE: DTC sets if wheel speed sensor does not output a signal when
driving, and an open circuit cannot be found.
1) Ensure sensor is properly installed. See WHEEL SPEED
SENSOR (WSS) under REMOVAL & INSTALLATION . Correct installation if
needed. If installation is okay, go to next step.
Page 138 of 1501
2) Disconnect ECU 26-pin connector. Check resistance between
specified ECU connector terminals. See
WHEEL SPEED SENSOR OUTPUT CIRCUIT IDENTIFICATION table. See Figs. 5-6.
Resistance for front sensors should be 1170-1350 ohms. Resistance for
rear sensors should be 1300-1500 ohms. If resistance is as specified,
go to next step. If resistance is not as specified, check and repair
connectors and related wiring between ECU and suspect sensor. See
WIRING DIAGRAMS .
3) Raise and support vehicle. Disconnect ECU connectors.
Using DVOM, backprobe specified ECU connector terminals. See
WHEEL SPEED SENSOR OUTPUT CIRCUIT IDENTIFICATION table. See Figs. 5-6.
Check voltage between each harness connector terminal while rotating
wheel at 1/2 to one rotation per second. If pulse voltage is 70 mV or
more, go to step 8). If voltage is not as specified, go to next step.
4) Inspect condition of suspect speed sensor. Ensure tip of
speed sensor is clean. If speed sensor is okay, go to next step.
5) Disconnect sensor connector. Using DVOM, check resistance
across sensor terminals. Resistance for front sensors should be 1170-
1350 ohms. Resistance for rear sensors should be 1300-1500 ohms. If
resistance is as specified, go to next step. If resistance is not as
specified, replace sensor.
6) Remove sensor. Check resistance between each sensor
terminal and sensor body. If resistance is 100,000 ohms or more, go to
next step. If resistance is not as specified, replace sensor.
7) Inspect condition of toothed rotor. Check for broken or
deformed teeth. If toothed rotor is okay, go to next step.
8) Check ECU connectors. Repair connectors as needed. If
connectors are okay, replace ECU.
DTC 25: FREE WHEEL ENGAGE SWITCH
NOTE: DTC sets if ECU detects an open circuit in free wheel engage
switch.
1) Start engine. Ensure 4WD indicator light operates
correctly when transfer shift lever is moved to desired 4WD positions.
If indicator light operates correctly, go to step 3). If indicator
light does not operate correctly, go to next step.
2) Turn engine off. Check wiring harness between 4WD
indicator control unit (located behind radio) and free wheel engage
switch (located on right side of front differential housing, near
carrier assembly). If circuit is okay, replace 4WD indicator control
unit.
3) Disconnect ECU 22-pin connector. Turn ignition on. Using
DVOM, check voltage between ECU 22-pin connector terminal No. 45 and
ground. See Figs. 5-6. In 2WD, battery voltage should exist. Battery
voltage should not exist in 4WD. If voltage is as specified, go to
next step. If voltage is not as specified, check and repair connectors
and wiring harness between free wheel engage switch and ECU. See
WIRING DIAGRAMS .
4) Check and repair ECU 22-pin connector. If connector is
okay, replace ECU.
DTC 26: CENTER DIFFERENTIAL LOCK DETECTION SWITCH
NOTE: DTC sets if ECU detects an open circuit in center
differential lock detection switch system.
1) Start engine. Ensure 4WD indicator light operates
correctly when transfer shift lever is moved to desired 4WD positions.
If indicator light does not operate correctly, go to step 4). If
indicator light operates correctly, go to next step.
2) Disconnect ECU 22-pin connector. Turn ignition on. Using
Page 140 of 1501
* Check for short in center differential lock switch circuit.
* Check for faulty center differential lock switch.
* Check for short in ECU circuit or faulty ECU.
* Check for short in indicator control unit circuit or faulty
4WD indicator control unit.
Repair wiring harness or replace component as necessary. See
WIRING DIAGRAMS .
5) If 4WD indicator light does not come on with transfer
shift lever in "4H" position, repair wiring harness between 4WD
indicator control unit and center differential lock switch. Check for
faulty 4WD indicator control unit.
6) If 4WD indicator light does not come on with transfer
shift lever in "4H" position, repair wiring harness between 4WD
indicator control unit and free wheel engage switch. See
WIRING DIAGRAMS . Check ground wire at engage switch. Check for faulty
free wheel engage switch.
DTC 27: REAR DIFFERENTIAL LOCK DETECTION SWITCH (WITH
DIFFERENTIAL LOCK)
NOTE: DTC is set if ECU detects an open circuit in rear
differential lock detection switch system.
1) Start engine. Ensure rear differential indicator light
comes on when top of rear differential lock switch (located below
radio) is pushed. If indicator light comes on, go to step 3). If
indicator light does not come on, go to next step.
2) Turn engine off. Check wiring harness between rear
differential lock control unit and rear differential lock switch. See
WIRING DIAGRAMS . Check rear differential lock control unit power
circuit. See REAR DIFFERENTIAL CONTROL UNIT under COMPONENT TESTS. If
circuit is okay, replace rear differential lock control unit.
3) Disconnect ECU 22-pin connector. Turn ignition on. Using
DVOM, check voltage between terminal No. 46 and ground. See Figs. 5-6.
When rear differential is locked, battery voltage should not be
present. When rear differential is unlocked, battery voltage should be
present. If voltage is as specified, go to next step. If voltage is
not as specified, repair connectors and related wiring harness between
ECU and rear differential lock switch. See WIRING DIAGRAMS.
4) Check and repair ECU 22-pin connector. If connector is
okay, replace ECU.
DTC 27: REAR DIFFERENTIAL LOCK DETECTION SWITCH (WITHOUT
DIFFERENTIAL LOCK)
NOTE: DTC is set if ECU detects an interruption of battery voltage
at ECU terminal No. 46.
1) Check fuse No. 18 in main fuse block. If fuse is blown,
correct cause of blown fuse, and replace fuse. If fuse is okay, go to
next step.
2) Disconnect ECU 22-pin connector. Turn ignition on. Using
DVOM, check voltage between terminal No. 46 and ground. See Figs. 5-6.
If battery voltage is present, go to next step. If battery voltage is
not present, check and repair connectors and related wiring harness
between ECU and fuse No. 18. See WIRING DIAGRAMS.
3) Check and repair ECU 22-pin connector. If connector is
okay, replace ECU.
DTC 32: "G" SENSOR SYSTEM
NOTE: DTC is set if ECU detects "G" sensor output voltage less