transmission MITSUBISHI MONTERO 1998 Service Manual

ABBREVIATIONS
1998 Mitsubishi Montero
GENERAL INFORMATION
COMMONLY USED ABBREVIATION
"A" ABBREVIATION TABLE
"A" ABBREVIATION TABLE







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ABBREVIATION DEFINITION 










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A Amperes 

A/C Air Conditioning 

A/T Automatic Transmission/Transaxle 

AAP Auxiliary Accelerator Pump 

AB Air Bleed 

ABCV Air Bleed Control Valve 

ABDC After Bottom Dead Center 

ABRS Air Bag Restraint System 

ABS Anti-Lock Brake System 

AC Alternating Current 

ACC A/C Clutch Compressor 

ACCS A/C Cycling Switch 

ACCUM Accumulator 

ACCY Accessory 

ACT Air Charge Temperature Sensor 

ACV Thermactor Air Control Valve 

ADJ Adjust or Adjustable 

ADV Advance 

AFS Airflow Sensor 

AI Air Injection 

AIR or A.I.R. Air Injection Reactor 

AIS Air Injection System 

ALCL Assembly Line Communications Link 

ALDL Assembly Line Diagnostic Link 

ARC Automatic Ride Control 

ASCD Automatic Speed Control Device 

ASCS Air Suction Control Solenoid 

ASD Auto Shutdown 

ASDM Air Bag System Diagnostic Module 

ASV Air Suction Valve 

ATC Automatic Temperature Control 

ATDC After Top Dead Center 

ATF Automatic Transmission Fluid 

ATS Air Temperature Sensor 

AXOD Automatic Transaxle Overdrive 

Abs. Absolute 

Accy. Accessory 

Alt. Alternator or Altitude 

Amp. Ampere 

Assy. Assembly 

Auto. Automatic 

Aux. Auxiliary 

Avg. Average 











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"B" ABBREVIATION TABLE
"B" ABBREVIATION TABLE

mm Millimeters 

M/T Manual Transaxle or Transmission 

MA PFI Mass Air Sequential Port Fuel Injection system 

MA or MAF Mass Airflow 

MAF Mass Air Flow sensor 

MAFS Mass Airflow Sensor 

MAP Manifold Absolute Pressure sensor 

MAT Manifold Air Temperature 

MCU Microprocessor Control Unit 

MCV Mixture Control Valve 

MEM-CAL Memory Calibration Chip 

MFI Multiport Fuel Injection 

MIL Malfunction Indicator Light 

MLP Manual Lever Position 

MPFI Multi Point Fuel Injection 

MPH Miles Per Hour 

MPI Multi-Point (Fuel) Injection 

Man. Manual 

Mech. Mechanical 

Mem. Memory 

Mtr. Motor 











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"N" ABBREVIATION TABLE
"N" ABBREVIATION TABLE







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ABBREVIATION DEFINITION 










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N.m Newton-Meter 

NA Not Available 

NDS Neutral Drive Switch 

NGS Neutral Gear Switch 

NOx Oxides of Nitrogen 

NPS Neutral Pressure Switch 

No. Number 

Nos. Numbers 











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"O" ABBREVIATION TABLE
"O" ABBREVIATION TABLE







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ABBREVIATION DEFINITION 










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O Oxygen 

O.D. Outside Diameter 

O/S Oversize 

O2 Oxygen 

OC Oxidation Catalyst 

OCC Output Circuit Check 

OD Overdrive 

ODO Odometer 

OHC Overhead Camshaft 

ORG Orange 

OSC Output State Check 

Opt. Option or Optional 

oz. Ounce 

ozs. Ounces 











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TCC Torque Converter Clutch 

TCCS Toyota Computer Control System 

TDC Top Dead Center 

TDCL Total Diagnostic Communication Link 

TFI Thick Film Ignition system 

TGS Top Gear Switch (cancels SIL in top gear) 

THERMAC Thermostatic Air Cleaner 

THS Transmission Hydraulic Switch 

TP/TPS Throttle Position Sensor 

TPI Tuned Port Injection 

TPS Throttle Position Sensor/Switch 

TS Temperature Sensor 

TSB Technical Service Bulletin 

TTS Transmission Temperature Switch 

TV Thermovalve 

TWC Three-Way Catalyst 

Temp. Temperature 

Trans. Transaxle/Transmission 











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"V" ABBREVIATION TABLE
"V" ABBREVIATION TABLE







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ABBREVIATION DEFINITION 










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V Valve 

VAF Vane Air Flow sensor or circuit 

VAPS Variable Assist Power Steering 

VAT Vane Air Temperature 

VATS Vehicle Anti-Theft System 

VBATT Vehicle Battery Voltage 

VCC Viscous Converter Clutch 

VIN Vehicle Identification Number 

VIO Violet 

VLR Volt Loop Reserve 

VM Vacuum Modulator 

VM Vane Meter 

VOM Volt-Ohmmeter (Analog) 

VPWR Vehicle Power supply voltage (10-14 volts) 

VREF Voltage Reference (ECA supplied reference voltage 

VRV Vacuum Regulator Valve 

VSC Vehicle Speed Control sensor or signal 

VSS Vehicle Speed Sensor or signal 

VSV Vacuum Switching Valve 

Vac. Vacuum 

Volt. Voltage 











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"W" ABBREVIATION TABLE
"W" ABBREVIATION TABLE







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ABBREVIATION DEFINITION 










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W/ With 

W/O Without 

WAC WOT A/C Cut-off switch or circuit 

WAC Wide Open Throttle A/C Switch 

WHT White 

WOT Wide Open Throttle 

YEL Yellow 

are continually republished. In addition to these, standards for Drive
Train and Transmissions have recently been promulgated. Participating
shops utilize these Uniform Inspection & Communication Standards as
part of the inspection process and for communicating their findings to
their customers.
The Motorist Assurance Program continues to work
cooperatively and proactively with government agencies and consumer
groups toward solutions that both benefit the customer and are
mutually acceptable to both regulators and industry. We maintain the
belief that industry must retain control over how we conduct our
business, and we must be viewed as part of the solution and not part
of the problem. Meetings with state and other government officials
(and their representatives), concerned with auto repair and/or
consumer protection, are conducted. Feedback from these sessions is
brought back to the association, and the program adjusted as needed.
To assure auto repair customers recourse if they were not
satisfied with a repair transaction, the Motorist Assurance Program
offers mediation and arbitration through MAP/BBB-CARE and other non-
profit organizations. MAP conducted pilot programs in twelve states
before announcing the program nationally in October, 1998. During the
pilots, participating repair shops demonstrated their adherence to the
Pledge and Standards and agreed to follow the UICS in communicating
the results of their inspection to their customers. To put some
"teeth" in the program, an accreditation requirement for shops was
initiated. The requirements are stringent, and a self-policing method
has been incorporated which includes the "mystery shopping" of
outlets.
We welcome you to join us as we continue our outreach... with
your support, both the automotive repair industry and your customers
will reap the benefits. Please visit MAP at our Internet site www.
motorist.org or contact us at:
1444 I Street, NW Suite 700
Washington, DC 20005
Phone (202) 712-9042 Fax (202) 216-9646
January 1999
MAP UNIFORM INSPECTION GENERAL GUIDELINES
OVERVIEW OF SERVICE REQUIREMENTS & SUGGESTIONS
It is MAP policy that all exhaust, brake, steering,
suspension, wheel alignment, drive-line, engine performance and
maintenance, and heating, ventilation and air conditioning, and
electrical services be offered and performed under the standards and
procedures specified in these sections.
Before any service is performed on a vehicle, an inspection
of the appropriate system must be performed. The results of this
inspection must be explained to the customer and documented on an
inspection form. The condition of the vehicle and its components will
indicate what services/part replacements may be "Required" or
"Suggested". In addition, suggestions may be made to satisfy the
requests expressed by the customer.
When a component is suggested or required to be repaired or
replaced, the decision to repair or replace must be made in the
customer's best interest, and at his or her choice given the options
available.
This section lists the various parts and conditions that
indicate a required or suggested service or part replacement.
Although this list is extensive, it is not fully inclusive. In
addition to this list, a technician may make a suggestion. However,
any suggestions must be based on substantial and informed experience,

AUTO TRANS DIAGNOSIS - R4AW3 & V4AW3
1998 Mitsubishi Montero
1997-98 AUTOMATIC TRANSMISSIONS
Mitsubishi R4AW3 & V4AW3 Electronic Controls
Montero, Montero Sport
APPLICATION
TRANSMISSION APPLICATION








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Vehicle Transmission Model
Montero Sport 2WD ............................................ R4AW3
Montero & Montero Sport 4WD .................................. V4AW3









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CAUTION: Vehicle is equipped with Supplemental Restraint System (SRS).
When servicing vehicle, use care to avoid accidental air bag
deployment. SRS-related components are located in steering
column, center console, instrument panel and lower panel on
instrument panel. DO NOT use electrical test equipment on
these circuits. If necessary, deactivate SRS before servicing
components. See AIR BAG SERVICING article in APPLICATIONS &
IDENTIFICATION.
DESCRIPTION
Automatic transmission is a 4-speed electronically controlled
transmission. Solenoids that control shift changes are located in
valve body. Solenoids are controlled by a Transmission Control Module
(TCM). TCM receives information from various input devices and uses
this information to control shift solenoids for transmission shifting
and lock-up solenoid for torque converter lock-up.
An Overdrive (OD) switch is mounted on the shift lever. When
OD switch is depressed to ON position, transmission will shift into
4th gear when shift lever is in "D" position, and OD OFF light on
instrument panel will go off. When OD switch is released to OFF
position, transmission will shift into 3rd gear, and OD OFF light on
instrument panel will illuminate.
A pattern select switch is located near shift lever on center
console. Pattern select switch contains a NORMAL and a HOLD operating
position. When pattern select switch is depressed (HOLD position) with\
shift lever in Drive position, transmission starts in 2nd gear.
Upshifts and downshifts will occur at a higher vehicle speed than with
switch in NORMAL position. See MITSUBISHI R4AW3 & V4AW3 OVERHAUL
article. Indicator light on instrument panel indicates pattern select
switch is in HOLD position.
Transmission is equipped with a shift lock and key interlock
system. Shift lock system prevents shift lever from being moved from
Park unless brake pedal is depressed. Key interlock system prevents
ignition key from being moved from ACC to LOCK position on ignition
switch unless shift lever is in Park. See MITSUBISHI SHIFT LOCK
SYSTEMS article.
OPERATION
TCM
TCM receives information from various input devices and uses

this information to control solenoids on transmission valve body. TCM
controls transmission shifting and torque converter lock-up.
TCM contains a self-diagnostic system, which will store
Diagnostic Trouble Codes (DTC) if failure or problem exists in
electronic control system. DTC can be retrieved to determine problem
area. See SELF-DIAGNOSTIC SYSTEM. TCM is located under left side of
instrument panel, left of steering column. See Fig. 1.
TCM INPUT DEVICES
Brakelight Switch Signal
Brakelight switch delivers input signal to TCM, indicating
vehicle braking. Brakelight switch is located on brake pedal support.
Cruise Control Electronic Control Unit (ECU)
Cruise control ECU delivers an input signal to control
overdrive operation in accordance with vehicle speed when cruise
control is operating. When in overdrive with cruise control on, if
vehicle speed drops 2 MPH less than the set speed, overdrive is
released to prevent reduction in vehicle speed. Once vehicle speed is
more than the set speed, overdrive function is resumed. If coolant
temperature is low, transmission will not shift into overdrive. Cruise
control ECU is located below center A/C vent, behind temperature
control panel on Montero. On Montero Sport, cruise control ECU is
located behind driver's kick panel.
Engine Coolant Temperature Sensor (ECT) Signal
Engine coolant temperature sensor delivers input signal to
TCM, indicating engine coolant temperature. Coolant temperature sensor
is located on engine.
Input & Output Shaft Speed Sensors
Sensors are magnetic pick-ups that monitor input and output
shaft speeds. AC waveforms are input to TCM by sensors. Sensors are
located on front and rear side of transmission case.
OD Switch Signal
The OD switch provides an input signal to TCM to indicate
when overdrive is selected by operator. When OD switch is depressed to
ON position, transmission will shift into 4th gear when shift lever is
in "D" position, and OD OFF light on instrument panel will go off.
When OD switch is released to OFF position, transmission will shift
into 3rd gear, and OD OFF light on instrument panel will come on. The
OD switch is mounted on shift lever.
Oil Temperature Sensor Signal
Oil temperature sensor provides TCM with ATF temperature
values. TCM uses this information to control shift points for maximum
performance. If transmission oil temperature exceeds standard values,
instrument panel ATF - TEMP light will come on. Sensor is mounted to
cooler line at transmission.
Park/Neutral Position (PNP) Switch Signal
PNP switch delivers an input signal to TCM indicating shift
lever position. Switch is located on side of transmission.
Throttle Position (TP) Sensor Signal
TP sensor delivers closed throttle and variable throttle
position input signals to TCM. TP sensor is located on side of
throttle body.
4WD Low Range Detection Switch
4WD low range detection switch provides information to TCM

when transfer case is in 4WD low-lock range.
Fig. 1: Locating Transmission Control Module (Montero)
Courtesy of Mitsubishi Motor Sales of America.
Fig. 2: Locating Transmission Control Module (Montero Sport)
Courtesy of Mitsubishi Motor Sales of America.
TCM OUTPUT DEVICES

Shift Solenoids No. 1 & No. 2
TCM controls transmission shifting by delivering an output
signal to operate proper solenoid. Solenoids are located on
transmission valve body. See Fig. 3. Solenoids are operated in
accordance with shift lever range. If a solenoid malfunctions, TCM may
select a preselected gear. See Fig. 4.
NOTE: TCM provides a fail-safe system which will place transmission
in preselected gear depending on solenoid failure. In other
gears, fail-safe system will not be activated and
transmission will be placed in a specified gear. See
Fig. 4.
Lock-Up Solenoid
TCM controls torque converter lock-up by delivering an output
signal to lock-up solenoid. Lock-up solenoid is activated when shift
lever is in "D" position and vehicle is at specified speed. Solenoid
is located on transmission valve body. See Fig. 3.
Fig. 3: Locating Lock-Up & Shift Solenoids
Courtesy of Mitsubishi Motor Sales of America.

Fig. 4: Checking Operation Of Shift Solenoids No. 1 & No. 2
Courtesy of Mitsubishi Motor Sales of America.
SELF-DIAGNOSTIC SYSTEM
SYSTEM DIAGNOSIS
NOTE: Before testing transmission, ensure fluid level is correct
and throttle and shift cables are properly adjusted. Ensure
engine starts with shift lever in Park and Neutral to ensure
proper adjustment of park/neutral position switch.
Transmission must first be tested by checking for stored
codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTC).
TCM monitors transmission operation and contains a self-
diagnostic system which stores a DTC if an electronic control system
failure or problem exists. If a problem exists in any of the solenoids
or speed sensors and a DTC is set, TCM delivers a signal to blink the
ATF TEMP light on instrument panel to warn the driver. DTC may be set
if a failure exists and can be retrieved for transmission diagnosis.
RETRIEVING DIAGNOSTIC TROUBLE CODES (DTC)
NOTE: Before retrieving DTC, ensure proper battery voltage exists
for proper self-diagnosis system operation. DO NOT disconnect
battery or ECM connectors before retrieving DTC.
Retrieving Codes Using Scan Tool
Ensure ignition switch is in OFF position. Connect scan tool
to Data Link Connector (DLC). See Fig. 5. Turn ignition switch to ON
position. Check for stored DTC and record code(s). See DIAGNOSTIC
TROUBLE CODE IDENTIFICATION table.

1) Check input speed sensor. See INPUT SPEED SENSOR under
COMPONENT TESTING. If resistance is as specified, reconnect speed
sensor connector and go to next step. If resistance is not as
specified replace input speed sensor and recheck DTCs.
2) Connect voltmeter between solenoid and sensor connector
terminals No. 9 and No. 10. See Fig. 9. Lift and support vehicle to
allow drive wheels to spin freely. With transmission in "D" position,
engine at 1000 RPM and wheel speed at 19 MPH (30 km/h). Measured
voltage should be .3-2.5 volts.
3) If voltage is as specified, go to next step. If voltage is
not as specified, replace input speed sensor. If DTC still exists,
check speed sensor rotor. See MITSUBISHI R4AW3 & V4AW3 OVERHAUL
article. If DTC still exists after speed sensor rotor is replaced,
check for noise interference and repair.
4) Check and repair wiring harness and connectors between
input speed sensor and TCM. If wiring is okay, recheck DTC. If DTC
still exists, replace TCM.
Fig. 9: Identifying Sensor & Solenoid Connector Terminals
Courtesy of Mitsubishi Motor Sales of America.
DTC 32: OUTPUT SPEED SENSOR
1) Check output speed sensor. See OUTPUT SPEED SENSOR under
COMPONENT TESTING. If resistance is as specified, reconnect speed
sensor connector and go to next step. If resistance is not as
specified replace output speed sensor and recheck DTCs.
2) Connect voltmeter between solenoid and sensor connector
terminals No. 3 and No. 4. See Fig. 9. Lift and support vehicle to
allow drive wheels to spin freely. With transmission in "D" position,
engine at 1000 RPM and wheel speed at 19 MPH (30 km/h). Measured