Mitsubishi Montero Sport (2004+). Manual — part 609
23A-1
GROUP 23A
AUTOMATIC
TRANSMISSION
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
AUTOMATIC TRANSMISSION
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLESHOOTING FLOW
INTRODUCTION TO A/T DIAGNOSIS . . . .
A/T DIAGNOSTIC TROUBLESHOOTING
STRATEGY. . . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
FAIL-SAFE/BACKUP FUNCTION. . . . . . . .
ROAD TEST . . . . . . . . . . . . . . . . . . . . . . . .
TORQUE CONVERTER STALL TEST . . . .
HYDRAULIC PRESSURE TESTS . . . . . . .
HYDRAULIC CIRCUIT . . . . . . . . . . . . . . . .
LINE PRESSURE ADJUSTMENT . . . . . . .
DIAGNOSTIC TROUBLE CODE CHART . .
SYMPTOM CHART
<AUTOMATIC TRANSMISSION> . . . . . . .
DIAGNOSTIC TROUBLE CODE
PROCEDURES. . . . . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES <AUTOMATIC
TRANSMISSION>. . . . . . . . . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
ACTUATOR TEST REFERENCE TABLE . .
INVECS-II CANCEL COMMAND. . . . . . . . .
PCM TERMINAL VOLTAGE REFERENCE
CHART FOR TRANSMISSION . . . . . . . . . .
PCM TERMINAL RESISTANCE AND
CONTINUITY INSPECTION CHART . . . . .
INSPECTION PROCEDURE USING AN
OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . .
A/T FAULTY OPERATION PREVENTION
MECHANISM DIAGNOSIS . . . . . . . . .
INTRODUCTION TO A/T KEY INTERLOCK
AND SHIFT LOCK MECHANISMS . . . . . . .
A/T KEY INTERLOCK AND SHIFT LOCK
MECHANISM DIAGNOSTIC
TROUBLESHOOTING STRATEGY . . . . . .
SYMPTOM CHART
<A/T FAULTY OPERATION
PREVENTION MACHANISM> . . . . . . . . . .
SYMPTOM PROCEDURES
<KEY INTERLOCK AND SHIFT LOCK
MECHANISMS> . . . . . . . . . . . . . . . . . . . . .
Continued on next page
WARNINGS REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICLES
WARNING
•
Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to
personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver and
passenger (from rendering the SRS inoperative).
•
Service or maintenance of any SRS component or SRS-related component must be performed only at an
authorized MITSUBISHI dealer.
•
MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B - Supplemental
Restraint System (SRS) before beginning any service or maintenance of any component of the SRS or any
SRS-related component.
NOTE
The SRS includes the following components: SRS air bag control unit, SRS warning light, front impact sensors, air bag module,
clock spring, and interconnecting wiring. Other SRS-related components (that may have to be removed/installed in connection
with SRS service or maintenance) are indicated in the table of contents by an asterisk (*).
23A-2
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
AUTOMATIC TRANSMISSION CONTROL
COMPONENT LAYOUT . . . . . . . . . . . . . . .
ESSENTIAL SERVICE . . . . . . . . . . . . . . . .
TRANSMISSION FLUID CHECK . . . . . . . .
TRANSMISSION FLUID CHANGE . . . . . . .
FLUSHING COOLERS AND TUBES . . . . .
OIL COOLER FLOW CHECK . . . . . . . . . . .
TP SENSOR ADJUSTMENT . . . . . . . . . . .
TRANSMISSION RANGE SWITCH
CONTINUITY CHECK. . . . . . . . . . . . . . . . .
TRANSMISSION RANGE SWITCH AND
CONTROL CABLE ADJUSTMENT. . . . . . .
HIGH RANGE/LOW RANGE DETECTION
SWITCH CHECK <V4A51> . . . . . . . . . . . .
TRANSFER LOW DETECTION SWITCH
CHECK <V4A51> . . . . . . . . . . . . . . . . . . . .
CENTER DIFFERENTIAL LOCK DETECTION
SWITCH CHECK <V4A51> . . . . . . . . . . . .
CENTER DIFFERENTIAL LOCK OPERATION
DETECTION SWITCH CHECK <V4A51>. .
TRANSFER OIL CHECK <V4A51> . . . . . .
TRANSFER OIL REPLACEMENT
<V4A51> . . . . . . . . . . . . . . . . . . . . . . . . . . .
SELECTOR LEVER OPERATION CHECK
KEY INTERLOCK MECHANISM CHECK. .
SHIFT LOCK MECHANISM CHECK . . . . .
AUTOMATIC TRANSMISSION CONTROL
COMPONENT CHECK . . . . . . . . . . . . . . . .
CRANKSHAFT POSITION SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TP SENSOR CHECK . . . . . . . . . . . . . . . . .
TRANSMISSION FLUID TEMPERATURE
SENSOR CHECK . . . . . . . . . . . . . . . . . . . .
TRANSMISSION RANGE SWITCH
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STOPLIGHT SWITCH CHECK . . . . . . . . . .
VEHICLE SPEED SENSOR CHECK . . . . .
DUAL PRESSURE SWITCH CHECK . . . . .
A/T CONTROL RELAY CHECK . . . . . . . . .
SOLENOID VALVE CHECK . . . . . . . . . . . .
TRANSMISSION CONTROL . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
A/T KEY INTERLOCK AND SHIFT
LOCK MECHANISMS* . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
TRANSMISSION AND TRANSFER
ASSEMBLY. . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
OIL PAN . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
TRANSMISSION FLUID COOLER,
HOSE AND PIPE . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
POWERTRAIN CONTROL
MODULE (PCM) . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
4WD INDICATOR ECU . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
LUBRICANTS . . . . . . . . . . . . . . . . . . . . . . .
SEALANT AND ADHESIVE . . . . . . . . . . . .
GENERAL DESCRIPTION
TSB Revision
AUTOMATIC TRANSMISSION
23A-3
GENERAL DESCRIPTION
M1231100100147
The automatic transmission comes in two models, R4A51 and V4A51.
TRANSMISSION
The transmission is made up of the torque converter
and the gear train. A 3-element, 1-step, 2-phase
torque converter with built-in torque converter clutch
is used. The gear train of the R/V4A51 transmission
made up of three sets of multiple disc clutches, two
sets of multiple disc brakes, one set of one-way
clutch and two sets of planetary carriers.
.
ITEM
SPECIFICATION
Model
R4A51
V4A51
Engine
6G74 (3.5L Engine)
6G74 (3.5L Engine)
Torque converter type
With torque converter clutch
With torque converter clutch
Transmission type
Electronically controlled
4-speed full automatic
Electronically controlled
4-speed full automatic
Control elements
Clutch
Multiple disc type 3 sets
Multiple disc type 3 sets
Brake
Multiple disc type 2 sets
Multiple disc type 2 sets
One-way clutch
Sprag type 1 set
Sprag type 1 set
Gear ratio
1st gear
2.842
2.842
2nd gear
1.495
1.495
3rd gear
1.000
1.000
4th gear
0.731
0.731
Reverse gear
2.720
2.720
Oil pump type
Gear type
Gear type
Oil cooling system
Water-cooled type
Water-cooled type
Transfer type
−
2-speed
Shift ratio
High
−
1.000
Low
−
1.900
Speedometer gear ratio
26/8 (3.0L Engine), 25/8 (3.5L
Engine)
29/9
GENERAL DESCRIPTION
TSB Revision
AUTOMATIC TRANSMISSION
23A-4
TRANSMISSION CONFIGURATION DRAWING
.
COMPONENTS AND FUNCTIONS
ACX01823
OD
REV
OWC
2ND
UD
LR
AB
COMPONENT
FUNCTION
Underdrive clutch
UD
connects the input shaft to the underdrive sun gear.
Reverse clutch
REV
connects the input shaft to the reverse sun gear.
Overdrive clutch
OD
connects the input shaft to the overdrive planetary carrier.
Low-reverse brake
LR
holds the low-reverse annulus gear and the overdrive planetary
carrier.
Second brake
2ND
holds the reverse sun gear.
One-way clutch
OWC
controls rotation direction of the low-reverse annulus gear.
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