2000 MITSUBISHI MONTERO automatic transmission fluid

23-1
AUTOMATIC
TRANSMISSION
CONTENTS
SERVICE SPECIFICATIONS 2.................
LUBRICANTS 2..............................
SPECIAL TOOLS 2..........................
TROUBLESHOOTING
3.....................................
>70................................

92 ..........................................
ON-VEHICLE SERVICE 94...................
Basic Adjustment Procedures 94.................
Transfer Oil Check 99...........................
Transfer Oil Change 99.........................
Location of Control Components 101..............
Control Component Checks 102..................
Torque Converter Stall Test 105..................
Fluid Pressure Test 106.........................Hydraulic Circuit 110............................
Line Pressure Adjustment 111...................
Selector Lever Operation Check 111..............
Transfer Shift Lever Operation Check 114........
Transmission Control Cable Adjustment 114......
Transfer-ECU Check 115........................
Position Indicator Lamp Check 115...............
TRANSMISSION CONTROL* 116.............
SHIFT LOCK AND KEY INTERLOCK
MECHANISMS* 120..........................
TRANSMISSION ASSEMBLY 122.............
TRANSMISSION OIL COOLER 127...........
A/T-ECU 129................................
TRANSFER-ECU 130........................
WARNING REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICLES
WARNING!
(1) 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 driver and passenger (from rendering
the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an authorized
MITSUBISHI dealer.
(3) 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-ECU, SRS warning lamp, air bag module, clock spring, and interconnecting
wiring. Other SRS-related components (that mayhave to be removed/installed in connectionwith SRS service or maintenance) are
indicated in the table of contents by an asterisk(*).


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AUTOMATIC TRANSMISSION -Troubleshooting 23-6
No.Inspection pro-
cedure if there is
an abnormality Diag-
nosis
code
No. Check item Judgment value Test/operation Pre-test/opera-
tion conditions
3Ignition switch:
START
Engine: StoppedStarting test at P or N
positionStarting should be
possibleStarting pos-
sible/not
possible-Starting not
possible
4Driving after en-
gine has warmed
upDrive for 15 minutes
or more until the A/T
fluid temperature
rises to 70 - 80_
C.Data list No.15
Gradually rises to 70
-80_
CA/T fluid tem-
perature
sensor15A/T fluid temper-
ature sensor sys-
tem
5Engine: Idling
Selector lever
position: NBrake pedal (re-test)
(1) Depressed
(2) ReleasedData List No. 26
(1) ON
(2) OFFStop lamp
switch26Stop lamp switch
system
A/C switch
(1) ON
(2) OFFData List No. 65
(1) ON
(2) OFFDual pres-
sure switch-Dual pressure
switch system
Accelerator pedal
(1) Fully closed
(2) ApplyData List No. 21
(1) The engine
speed displayed
on the tachome-
ter is identical to
the engine
speed displayed
on MUT-II.
(2) Gradually in-
creases from (1)Crank angle
sensor
<6G7>
Engine
speed sen-
sor
<4M4>21Crank angle sen-
sor system
<6G7>
Engine speed
sensor system
<4M4>
Data List
No.73 <6G7>
No.76 <4M4>
(2) Data changes.Communica-
tion with en-
gine-ECU51Serial commu-
nication system
Selector lever posi-
tionNo abnormal shock
during shiftingMalfunction
when start--Engine stalls dur-
ing shifting
(1) N to D
(2) N to RWithin 2 seconds of
time laging off-N-to-D shocks,
large time lag
-N-to-R shocks,
large time lag
-N-to-D, N-to-R
shocks, large
time lag
Driving not
possible-Does not move
forward
-Does not reverse
-Does not move
(forward or re-
verse)


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AUTOMATIC TRANSMISSION -Troubleshooting 23-12
CHART CLASSIFIED BY DIAGNOSIS CODE
Diagnosis
codeDiagnosis itemReference page
11Accelerator pedal position sensor (APS) systemShort-circuit23-13
12Open circuit23-14
14Incorrect sensor
adjustment23-15
15A/T fluid temperature sensor systemOpen circuit23-17
21Crank angle sensor system <6G7> or engine speed sensor
system <4M4>Open circuit23-18
22Input shaft speed sensor systemShort-circuit/Open
circuit23-20
23Output shaft speed sensor systemShort-circuit/Open
circuit23-22
25Wide open throttle switch systemShort-circuit/Open
circuit23-24
26Stop lamp switch systemShort-circuit23-25
31LR solenoid valve systemShort-circuit/Open
circuit23-26
32UD solenoid valve systemShort-circuit/Open
circuit23-27
332nd solenoid valve systemShort-circuit/Open
circuit23-28
34OD solenoid valve systemShort-circuit/Open
circuit23-29
35RED solenoid valve systemShort-circuit/Open
circuit23-30
36DCC solenoid valve systemShort-circuit/Open
circuit23-31
411st without completion of shifting23-32
422nd without completion of shifting23-34
433rd without completion of shifting23-36
444th without completion of shifting23-38
455th without completion of shifting23-40
46Reverse without completion of shifting23-42
51Problem communicating with engine-ECU23-43
52Damper clutch control systemSystem malfunc-
tion23-44
54A/T control relay systemShort-circuit to
earth/Open circuit23-45
56N range lamp systemShort-circuit to
earth23-46


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AUTOMATIC TRANSMISSION -Troubleshooting 23-17
Code No. 15 A/T fluid temperature sensor systemProbable cause
If the A/T fluid temperature sensor output is 4.5 V or higher even after driving
for 10 minutes or more (fluid temperature does not rise), it isjudged that there
is an opencircuit in the A/T fluid temperature sensor and code No. 15 is output.DMalfunction of A/T fluid temperature sensor
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NG
Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.)
Check the following connectors:<6G7> D-121,<4M4>D-108
OK
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
OKRepair NG
NG
To the nextpage
OK
NG
NG
OK
Measure at engine-A/T-ECU connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal 81 and earth
D<4M4> Voltage between terminal 43 and earth
OK:0.5 V or less
NG OK
Check the following connectors:<6G7> D-122,<4M4>D-108
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
OK
NGReplace the A/T fluid temperature sensor.
L
Measure at engine-A/T-ECU connector D-122 <6G7>, or at
A/T-ECU connector D-108 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal 124 and earth
D<4M4> Voltage between terminal 44 and earth
OK:A/T fluid temperature
3.8 - 4.0 V at 20
_C
3.2 - 3.4 V at 40
_C
1.7 - 1.9 V at 80
_COK
MUT-
IIData List
DNo.15 A/T fluid temperature sensor
OK:When the engine iscold, the temperature is about
the same as the atmospheric temperature (air tem-
perature).
When the engine is hot, the temperature is 70 -
80
_C.
NG
Repair
NG
Revision
Measure at solenoid valve assembly connector C-04.
DDisconnect the connector and measure at the sensor side.
DResistance between terminals 1 and 2
OK:A/T fluid temperature
16.7 - 20.5 k
Wat 0
_C
7.3 - 8.9 k
Wat 20
_C
3.4 - 4.2 k
Wat 40
_C
1.9 - 2.2 k
Wat 60
_C
1.0 - 1.2 k
Wat 80
_C
0.57 - 0.69 k
Wat 100
_C
Check the following connectors:<6G7> C-04, D-122,
D-121,<4M4> D-108, C-04


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AUTOMATIC TRANSMISSION -Troubleshooting 23-49
Inspection procedure 2
Starting not possible
Probable cause
If the enginewill not start when the selector lever is at the P or N position, the
cause is probably a malfunction of the inhibitor switch system, the transmission
control cable assembly, theenginesystem, the torque converter or the oil pump.DMalfunction of inhibitor switch system
DMalfunction of transmission control cable assembly
DMalfunction of enginesystem
DMalfunction of torque converter
DMalfunction of oil pump
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NG
Inspection Procedure 16: Inhibitor switch system check (Refer
to P.23-58.)NG
Repair or replace
OK
Torque converter check
DCheck for incorrect installation (inserted at an angle, etc.)
or damagedsplines.NGIf repair is possible, repair the damaged part.
If repair is not possible because the splines aredamaged,
replace the torque converter assembly.
OK
Replace the oil pumpassembly.
L
(The oilpump cannot be disassembled.)
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair
OK
Transmission control cable assembly checkNG
Repair OK
Check the trouble symptoms.Replace the engine-A/T-ECU or A/T-ECU.
Inspection procedure 3
Does not move forward
Probable cause
If the vehicle does not move forward when theengine is idling and theselector
lever is moved from N to D, 3, 2 or L, or if it is shifted to 1st or 2nd in Sports
mode, the cause is probably a problem with line pressure, or a malfunction of
the UD clutch or valve body.DAbnormal line pressure
DMalfunction of UD solenoid valve
DMalfunction of UD clutch system
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
MUT-
IIActuator Test
DNo.2 UD solenoid valve
OK:Sound of operation can be heardNGReplace the solenoid valve.
L
OK
Fluid pressure test (Refer to P.23-106.)
DMeasure the fluid pressure at each element in 1st in
Sportsmode
Standard value:Refer to P.23-106.NGDisassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
UD clutch system check
DRemove the transmission assembly, the valve body cover
and the valve body.
DBlow air through the UD clutch oilhole in the transmission
case, and check that the piston operates to maintain
pressure.
UD clutch check
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.OKCheck the trouble symptoms. NG
Replace the engine-A/T-ECU or A/T-ECU.NG


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AUTOMATIC TRANSMISSION -Troubleshooting 23-50
Inspection procedure 4
Does not reverse
Probable cause
If the vehicle does not reverse when theengine is idling and theselector lever
is moved from N to R, the cause is probably a problem with reverse clutch
pressure or LR brake pressure, or a malfunction of the reverse clutch, LD clutch
or valve body.DAbnormal reverse clutch pressure
DAbnormal LR brake pressure
DMalfunction of LR solenoid valve
DMalfunction of reverse clutch
DMalfunction of LR brake
DMalfunction of valve body
DReplacement of engine-A/T-ECU <6G7>
DReplacement of A/T-ECU.<4M4>
LRefer to the Transmission Workshop Manual.
NGReplace the solenoid valve.
L
OK
NG
OK
NG
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
Reverse clutch system and LR brake system check
L
DRemove the transmission assembly, the valve body cover
and the valve body.
DBlow air through the reverse clutch oilhole or LRbrake
air hole in the transmissioncase, and check that the
piston operates to maintain pressure.OK
Check the reverse clutch and LR brake.
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.NGCheck the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG
MUT-
IIActuator Test
DNo. 1 LR solenoid valve
OK:Sound of operation can be heard
Fluid pressure test (Refer to P.23-106.)
DMeasure the reverse clutch fluid pressure in R range.
Standard value:Refer to P.23-106.
Fluid pressure test (Refer to P.23-106.)
DMeasure the LR brake fluid pressure in R range.
Standard value:Refer to P.23-106.


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AUTOMATIC TRANSMISSION -Troubleshooting AUTOMATIC TRANSMISSION -Troubleshooting 23-51
Inspection procedure 5
Does not move (forward or reverse)
Probable cause
If the vehicle does not move forward or reverse when the selector lever is
moved to any position while the engine is idling, thecause is probably a
problem with line pressure or a malfunction of the oil pumps and valve bodies in
the power train.DAbnormal line pressure
DMalfunction of power train components
DMalfunction of oil pump
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Fluid pressure test (Refer to P.23-106.)
DMeasure the fluid pressure at each element in 1st, 2nd
and reverse.
Standard value:Refer to P.23-106.OKCheck the power train components
L
DDisassemble the transmission and check the condition of
components such as the planetary carrier, output shaft and
differential.
NG
Replace the oil pumpassembly.
L
(The oilpump cannot be disassembled.)
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.NG
NG
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Inspection procedure 6
Engine stalls during shifting
Probable cause
If the enginestalls when the selector lever is moved from N to D or R while the
engine is idling, thecause is probably a malfunction of theenginesystem, DCC
solenoid valve, valve body, or torque converter (damper clutch).DMalfunction of enginesystem
DMalfunction of DCC solenoid valve
DMalfunction of valve body
DMalfunction of torque converter (malfunction of
damper clutch)
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair or replace
OK
Replace the DCC solenoid valve.
L
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.NGReplace the torque converter assembly.
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG


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AUTOMATIC TRANSMISSION -Troubleshooting 23-52
Inspection procedure 7
N-to-D shocks, large time lag
Probable cause
If abnormalshocks or atime lag of 2 seconds or more occurs when the
selector lever is moved from N to D while theengine is idling, thecause is
probably abnormal UD clutch pressure, or a malfunction of the UD clutch, valve
body or APS.DAbnormal UD clutch pressure
DMalfunction of UD solenoid valve
DMalfunction of UD clutch system
DMalfunction of valve body
DMalfunction of APS
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NO
MUT-
IIActuator Test
DNo.2 UD solenoid valve
OK:Sound of operation can be heardNGReplace the solenoid valve.
L
OK
When starting off
Shocks are sometimes generated.
NG
UD clutch check
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.
NG
Code No. 11, 12, 14 APS system check (Refer to P.23-13, 14
and 15.)
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
During shifting
Fluid pressure test (Refer to P.23-106.)
DMeasure the UD clutch fluid pressure when shifting from N
to D.
Standard value:Refer to P.23-106.MUT-
IIData List
DNo.11 APS
OK:Increases in proportion to the acceleratorpedal open-
ing angle.
YES
OK OK
UD clutch system check
L
DRemove the transmission assembly, the valve body cover
and the valve body.
DBlow air through the UD clutch oilhole in the transmission
case, and check that the piston operates to maintain
pressure.NG
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG
When areshocksgenerated?


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