1998 MITSUBISHI MONTERO check engine

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

Using a screwdriver, remove pattern select switch from
console. Switch is located at rear of selector lever, to right of
emergency brake handle. Using a DVOM, check continuity between pattern
select switch terminals No. 1 and 2, with switch in HOLD position.
Continuity should exist. With switch in POWER position, check
continuity between terminals No. 1 and 6. Continuity should exist. If
continuity is not as specified, replace switch. See Fig. 12.
Fig. 12: Identifying Pattern Select Switch Terminals
Courtesy of Mitsubishi Motor Sales of America.
SOLENOIDS
For solenoid testing, refer to the appropriate DTC under
DIAGNOSTIC TESTS. To check solenoid operation, apply battery voltage
to appropriate terminal of TCM connector and ground. Ensure operating
sound can be heard when battery voltage is connected. Replace solenoid
if operating sound cannot be heard.
THROTTLE POSITION (TP) SENSOR
For diagnostic and testing information, see appropriate SELF-
DIAGNOSTICS article in ENGINE PERFORMANCE section.
4WD LOW RANGE DETECTION SWITCH
For location and testing information on 4WD low range
detection switch, see appropriate article in AXLE SHAFTS & TRANSFER
CASES.
TCM PIN VOLTAGE CHARTS
Access TCM. See Fig. 1 or 2. Turn ignition on. Using DVOM,

backprobe TCM connector. See Fig. 13. Check voltage between designated
terminals on TCM connector and ground. See TCM TERMINAL VOLTAGE
SPECIFICATIONS table. Voltage should be as specified.
Fig. 13: Identifying TCM Terminals
Courtesy of Mitsubishi Motor Sales of America.
TCM TERMINAL VOLTAGE SPECIFICATIONS








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Terminal Circuit  Condition  Voltage 


No.    
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1  Lock-Up Solenoid Lock-Up Clutch Engaged Battery 
\b









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1  Lock-Up Solenoid  Lock-Up Clutch  0 Volts 

  Disengaged  
\b









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2  Back-Up Power Supply  At All Times  Battery 
\b









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5  Brakelight Switch  Brake Pedal Depressed 0 Volts 
\b









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5  Brakelight Switch  Brake Pedal Released  Battery 
\b









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8  TP Sensor Throttle Closed (Idle) .3-1.0 
\b









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8  TP Sensor  Throttle Wide Open  4.4-5.0 
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11  Neutral Safety Switch In "P" Position  Battery 
\b









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11  Neutral Safety Switch Except In "P"  0 Volts 
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12  Ground  Engine Idling  0 Volts 

Major Control Systems/Devices ..... PCV, EVAP, (5) TWC, ( 4) EGR,
FR, SPK, ( 6) ( 7) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, ( 4) EGR-SOL, ( 4) EGR-VCV, SPK-CC
Montero Sport
2.4L 4-Cyl. SFI
Major Control Systems/Devices ..... PCV, EVAP, TWC, FR, ( 4) EGR,
SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, ( 4) EGR-SOL, ( 4) EGR-VCV, SPK-CC
3.0L V6 SFI
Major Control Systems/Devices ..... PCV, EVAP, TWC, (4) EGR, FR,
SPK, ( 6) ( 7) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VCS, EVAP-VSOL, ( 4) EGR-VCS, SPK-CC
3000GT
3.0L V6 SFI
Non-Turbo
Major Control Systems/Devices ........ PCV, EVAP, (8) TWC, FR,
EGR, SPK, ( 9) HO2S, CEC, MIL
Components/Other Related Devices ......... EVAP-CPCS, EVAP-VC,
EGR-SOL, EGR-VCV, SPK-CC
Turbo
Major Control Systems/Devices ........ PCV, EVAP, (8) TWC, FR,
EGR, SPK, ( 9) HO2S, CEC, MIL
Components/Other Related Devices ........ EVAP-CKV, EVAP-CPCS,
EVAP-VC, EGR-SOL, EGR-VCV, SPK-CC
( 1) - Equipped with 2 HO2Ss.
( 2) - Equipped with 2 EVAP-CKVs.
( 3) - California equipped with 2 TWCs.
( 4) - Federal.
( 5) - California equipped with 3 TWCs.
( 6) - Federal equipped with 2 HO2Ss.
( 7) - California equipped with 4 HO2Ss.
( 8) - Equipped with 3 TWCs.
( 9) - Equipped with 4 HO2Ss.









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NOTE: California or Federal refers to installed emissions
equipment. California emissions models may be available in
all states.
APPLICATION ABBREIVEATIONS
APPLICATION ABBREIVEATIONS TABLE








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Application Abbreiveation
CEC .................................... Computerized Engine Control
EGR ...................................... Exhaust Gas Recirculation
EGR-CS ........................................ EGR Control Solenoid
EGR-SOL ............................................... EGR Solenoid
EGR-TS ..................................... EGR Transducer Solenoid
EGR-VCV ................................... EGR Vacuum Control Valve
EVAP ....................................... Fuel Evaporative System
EVAP-CKV .......................................... EVAP Check Valve
EVAP-CPCS ..................... EVAP Canister Purge Control Solenoid
EVAP-CPCV ........................ EVAP Canister Purge Control Valve
EVAP-VC ........................................ EVAP Vapor Canister
EVAP-VCS .............................. EVAP Vacuum Control Solenoid
EVAP-VSOL ................................ EVAP Ventilation Solenoid

Diamante, Eclipse,
Montero Sport & Galant .......................... 6.9-7.1 (175-181)\
Mirage ........................................... 6.4-6.6 (164-167)\
Montero .......................................... 7.3-7.5 (186-191)\
3000GT ........................................... 7.0-7.2 (177-182)\









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3) Tighten lock nut, and ensure brake pedal height is within
specification. Start engine to evacuate brake booster chamber. Stop
engine, and apply brake several times to remove vacuum from brake
booster.
4) Using hand pressure, depress brake pedal to measure free
play before resistance is felt. Free play distance for all models is
0.10-0.31" (3-8 mm). If distance is not within specification, it is
probably caused by excessive play between the brake pedal arm and the
clevis pin. Check and replace as necessary.
5) Start engine and apply 110 lbs. (490 N) of pressure to
brake pedal. With the carpet pulled back, measure the distance between
the brake pedal and the floorboard. If the distance is not 3.1-3.5"
(80-90 mm) check for air in brake hydraulic system, brake adjustment
or defective parking brake component or adjustment. Adjust or repair
as necessary.
LOAD-SENSING PROPORTIONING VALVE (LSPV)
Montero
1) Park vehicle on level surface. Remove excess weight from
vehicle. Make sure the lever is all the way towards the valve side.
Measure length of entire spring. See Fig. 1.
If spring length is not within specification, adjust spring
support until correct length is obtained. See LSPV SPRING LENGTH
table.
Fig. 1: Adjusting Load-Sensing Proportioning Valve Spring (Montero)
Courtesy of Mitsubishi Motor Sales of America.
BRAKE BOOSTER PUSH ROD

times then switch the engine off.
2) Remove the master cylinder from the brake booster making
sure the push rod is not disturbed and the brake pedal is not
depressed after master cylinder removal.
3) Using a Vernier Caliper and Block Gauge, measure the
thickness of the block gauge and add .366" (9.3 mm) to the gauge
thickness and set the caliper to this dimension. See Fig. 4.
Fig. 4: Setting Caliper And Block Gauge (Diamante)
Courtesy of Mitshbishi Motor Sales of America.
4) Check the push rod position with vernier caliper set to
the calculated dimension. Specification range .362"-.370" (9.2-9.4
mm). See Fig. 5.