1998 MITSUBISHI MONTERO transmission

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

voltage should be .3-2.5 volts.
3) If voltage is as specified, go to next step. If voltage is
not as specified, replace the output speed sensor. If DTC still
exists, check speed sensor rotor. See MITSUBISHI R4AW3 & V4AW3
OVERHAUL article. If DTC exists after speed sensor rotor is replaced,
check for noise interference and repair.
4) Check and repair wiring harness and connectors between
output speed sensor and TCM. If wiring is okay, recheck DTCs. If DTCs
still exists, replace TCM.
DTC 41 & 42: OPEN OR SHORT IN SOLENOID NO. 1 CIRCUIT
NOTE: A stuck solenoid will not set a DTC. DTCs are only set for
circuit malfunctions, not mechanical failures.
1) Disconnect solenoid and sensor connector. Using ohmmeter,
check resistance between solenoid connector terminal No. 6 and ground.
See Fig. 9 . Resistance should be 11-15 ohms at 77
F (25C). If
resistance is as specified, go to next step. If resistance is not as
specified, replace solenoid No. 1 and recheck DTC.
2) Check wiring harness and connectors between solenoid No. 1
and TCM. If wiring and solenoid No. 1 is okay, replace TCM.
DTC 43 & 44: OPEN OR SHORT IN SOLENOID NO. 2 CIRCUIT
NOTE: A stuck solenoid will not set a DTC. DTCs are only set for
circuit malfunctions, not mechanical failures.
1) Disconnect solenoid and sensor connector. Using ohmmeter,
check resistance between solenoid connector terminal No. 7 and ground.
See Fig. 9 . Resistance should be 11-15 ohms at 77
F (25C). If
resistance is as specified, go to next step. If resistance is not as
specified, replace solenoid No. 2 and recheck DTC.
2) Check wiring harness and connectors between solenoid No. 2
and TCM. If wiring and solenoid No. 2 is okay, replace TCM.
DTC 47 & 48: OPEN OR SHORT IN LOCK-UP SOLENOID CIRCUIT
NOTE: A stuck solenoid will not set a DTC. DTCs are only set for
circuit malfunctions, not mechanical failures.
1) Disconnect solenoid and sensor connector. Using ohmmeter,
check resistance between solenoid connector terminal No. 8 and ground.
See Fig. 9 . Resistance should be 11-15 ohms at 77
F (25C). If
resistance is as specified, go to next step. If resistance is not as
specified, replace lock-up solenoid and recheck DTC.
2) Check wiring harness and connectors between lock-up
solenoid and TCM. If wiring and lock-up solenoid is okay, replace TCM.
DTC 49: TORQUE CONVERTER CLUTCH (TCC) ENGAGEMENT MALFUNCTION
1) Using scan tool, verify vehicle tachometer and scan tool
vehicle RPM values are identical. If tachometer values are identical,
go to next step. If tachometer values are different, test ignition
signal circuit. See DTC 21 & 22: SHORT OR OPEN IN IGNITION SIGNAL
CIRCUIT.
2) Lift and support vehicle to allow drive wheels to spin
freely. With transmission in "D" position, run engine to 1300-1900
RPM. Verify scan tool and speedometer read 31 MPH (50 km/h). If values\
are identical, go to next step. If values are different, test input
speed sensor. See DTC 31: INPUT SPEED SENSOR.
3) Check lock-up solenoid for proper operation. See SOLENOIDS

under COMPONENT TESTING. If lock-up solenoid is okay, go to next step.
If lock-up solenoid is bad, replace and retest system.
4) Check wiring harness and connectors between lock-up
solenoid and TCM. If wiring harness and connectors are okay, check TCC
engagement hydraulic pressure, valve body malfunction or TCC slipping.
DTC 50: TCC DISENGAGEMENT MALFUNCTION
1) Using scan tool, verify vehicle tachometer and scan tool
vehicle RPM values are identical. If tachometer values are identical,
go to next step. If tachometer values are different, test ignition
signal circuit. See DTC 21 & 22: SHORT OR OPEN IN IGNITION SIGNAL
CIRCUIT.
2) Lift and support vehicle to allow drive wheels to spin
freely. With transmission in "D" position, run engine to 1300-1900
RPM. Verify scan tool and speedometer read 31 MPH (50 km/h). If values\
are identical, go to next step. If values are different, test input
speed sensor. See DTC 31: INPUT SPEED SENSOR.
3) Check lock-up solenoid for proper operation. See SOLENOIDS
under COMPONENT TESTING. If lock-up solenoid is okay, go to next step.
If lock-up solenoid is bad, replace and retest system.
4) Check wiring harness and connectors between lock-up
solenoid and TCM. If wiring harness and connectors are okay, check
valve body malfunction or TCC sticking.
DTC 51: 1ST GEAR RATIO SIGNAL INCORRECT
1) If DTC 31 is set, go to DTC 31: INPUT SPEED SENSOR. If DTC
31 is not set and DTC 32 is set, go to DTC 32: OUTPUT SPEED SENSOR. If
neither DTC 31 nor DTC 32 is set, go to next step.
2) Test input speed sensor. See INPUT SPEED SENSOR under
COMPONENT TESTING. If resistance is as specified, go to next step. If
resistance is not as specified, replace input speed sensor and recheck
DTC. If DTC still exists, go to step 5).
3) Test output speed sensor. See OUTPUT SPEED SENSOR under
COMPONENT TESTING. If resistance is as specified, go to next step. If
resistance is not as specified, replace output speed sensor and
recheck DTC. If DTC still exists, go to step 5).
4) If referenced here from another DTC, go back to referenced
DTC. Check No. 2 one-way clutch system. See NO. 2 ONE-WAY CLUTCH in
MITSUBISHI R4AW3 & V4AW3 OVERHAUL article.
5) Check output speed sensor and No. 2 speed sensor shielding
wire. Repair as necessary. If shielding wire is okay, recheck DTC. If
DTC still exists, replace sensor rotor. If DTC still exists after
sensor rotor is replaced, check for interference noise and repair.
DTC 52: 2ND GEAR RATIO SIGNAL INCORRECT
If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check 2nd brake and No. 1 one-
way clutch systems for a mechanical failure. See 2ND BRAKE and NO. 1
ONE-WAY CLUTCH in MITSUBISHI R4AW3 & V4AW3 OVERHAUL article.
DTC 53: 3RD GEAR RATIO SIGNAL INCORRECT
If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check direct clutch system for a
mechanical failure. See DIRECT CLUTCH in MITSUBISHI R4AW3 & V4AW3
OVERHAUL article.
DTC 54: 4TH GEAR RATIO SIGNAL INCORRECT

If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check overdrive brake for a
mechanical failure. See OVERDRIVE BRAKE in MITSUBISHI R4AW3 & V4AW3
OVERHAUL article.
SYMPTOM TROUBLE SHOOTING
NOTE: Check system using appropriate scan tool. See WIRING DIAGRAMS
for electrical schematics and COMPONENT TESTING.
COMMUNICATION WITH SCAN TOOL NOT POSSIBLE
If scan tool cannot communicate with TCM, check proper
connection with DLC. Check TCM power circuits, TCM ground circuits and
malfunctioning TCM.
SHIFT POINTS INCORRECT
If shift points are incorrect, check for DTCs. If no DTC is
present, check oil temperature sensor, pattern select switch, 4WD low
range detection switch and TCM for proper operation.
UPSHIFTS OCCUR SPONTANEOUSLY
If upshifting occurs spontaneously, check park/neutral
position switch, overdrive switch and TCM for proper operation.
TCC LOCK-UP MALFUNCTIONING
If TCC lock-up system is not operating properly, check torque
converter, valve body, lock-up switch and oil temperature switch.
COMPONENT TESTING
A/T FLUID TEMPERATURE SWITCH
1) Remove fluid temperature switch, located to rear of
neutral safety switch. Immerse switch in container of ATF up to top
threaded portion of switch. Using a DVOM, check continuity between
switch terminals. Continuity should not exist when fluid temperature
is 257
F (125C) or less.
2) When fluid is heated to 289-304F (143-151C), continuity
should exist. Replace switch if necessary. Apply thread sealant to
fluid temperature switch threads and install in transmission.
BRAKELIGHT SWITCH
1) Disconnect electrical connector from brakelight switch,
located near brake pedal. Using ohmmeter, ensure continuity exists
between terminal No. 2 (White/Red wire) and terminal No. 3 (Green
wire) with brake pedal released. Replace brakelight switch if
continuity does not exist. Continuity should not exist between
terminals No. 2 and No. 3 with brake pedal depressed.
2) If continuity does not exist, ensure brake pedal is
properly adjusted so brakelight switch has proper travel for switch
operation. If proper brakelight switch travel exists, replace
brakelight switch.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR

until brakelight plunger contacts brake pedal.
2) Loosen brakelight switch 1/2 to one turn. Install and
tighten lock nut on brakelight switch. Install electrical connector.
Ensure brakelights and cruise control operate properly.
INPUT SPEED SENSOR
Removal & Installation
Disconnect electrical connector. Remove bolt securing sensor
to transmission. Remove input speed sensor from transmission. See
Fig. 14 . To install, reverse removal procedure.
Fig. 14: Locating Input Speed Sensor
Courtesy of Mitsubishi Motor Sales of America.
OIL TEMPERATURE SENSOR
Removal & Installation
Sensor is located on transmission connected to cooler line,
near PNP switch. Disconnect electrical connector. Remove oil
temperature sensor from transmission. To install, reverse removal
procedure using NEW gasket.
OUTPUT SPEED SENSOR
Removal & Installation

Disconnect electrical connector from output speed sensor. See
Fig. 15. Remove bolt and output speed sensor. To install, reverse
removal procedure.
Fig. 15: Locating Output Speed Sensor & Connector
Courtesy of Mitsubishi Motor Sales of America.
PARK/NEUTRAL POSITION (PNP) SWITCH
Removal
Switch is located on side of transmission. Remove manual
lever from control shaft on transmission. Bend up tabs on lock washer.
Remove lock nut, lock washer and seal from control shaft. Remove
retaining bolt and neutral safety switch.
Installation
1) Install switch on control shaft. Loosely install switch
retaining bolt. Install seal and lock washer. Install lock nut and
tighten to specification. See TORQUE SPECIFICATIONS.
2) Switch must be adjusted. Ensure parking brake is applied.
Temporarily install manual lever on control shaft. Place shift lever
in Neutral. Remove manual lever. Rotate switch and align reference
mark on switch with groove.
3) Hold switch in this position. Tighten retaining bolt to
specification. Bend tabs on lock washer over against lock nut. To
install remaining components, reverse removal procedure.

SOLENOIDS
Removal & Installation
Solenoids are located on transmission valve body. See Fig. 3.
Remove bolt, solenoid and gasket from valve body. To install, reverse
removal procedure.
THROTTLE POSITION SENSOR
NOTE: For removal and installation information, see appropriate
SELF-DIAGNOSTICS article in ENGINE PERFORMANCE section.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS








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Application INCH Lbs. (N.m)\
Park/Neutral Switch Bolt .................................. 48 (5.4)\
Park/Neutral Switch Lock Nut .............................. 35 (4.0)\









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WIRING DIAGRAMS