1991 MITSUBISHI MONTERO battery

2) Using a 1.5-volt dry cell battery, connect positive end of
1.5-volt battery to power transistor terminal No. 1 and negative end
to terminal No. 2. DVOM should now read continuity at power transistor
terminals No. 2 and No. 3. Replace power transistor if it does not
test as described. See Fig. 6.
Fig. 5: Power Trans Conn ID (Colt Vista, Galant, Montero, P/U & Ram
50)
Courtesy of Mitsubishi Motor Sales of America.
Fig. 6: Testing Power Trans (Colt Vista, Galant, Montero, Pickup &
Ram-50)
Courtesy of Mitsubishi Motor Sales of America.
Power Transistor (Colt, Colt 200, Mirage & Summit)

1) Disconnect power transistor connectors. Using a DVOM,
connect positive ohmmeter lead to terminal No. 2 and negative lead to
terminal No. 7. See Fig. 7. Ensure there is no continuity.
2) Using a 1.5-volt dry cell battery, connect positive end of
1.5-volt battery to power transistor terminal No. 8 and negative end
to terminal No. 7. DVOM should now read continuity at power transistor
terminals No. 2 and No. 7. Replace power transistor if it does not
test as described.
Fig. 7: Power Transistor Connector ID (Colt, Summit & Mirage)
Courtesy of Mitsubishi Motor Sales of America.
Power Transistor (Stealth & 3000GT)
When testing power transistor, refer to POWER TRANSISTOR
TESTING (STEALTH & 3000GT) table.
Fig. 8: Power Transistor Connector ID (Stealth & 3000GT)
Courtesy of Mitsubishi Motor Sales of America.
POWER TRANSISTOR TESTING TABLE (STEALTH & 3000GT) (1)









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(2) Analog Ohmmeter (2) With 1.5 V Battery
Cylinders Connected Between Connected Between
Tested Terminals (No 1.5 V Battery) Terminals\
1 & 4 ......... 3 & 7 No Continuity ....... 6 & 7 Continuity
2 & 5 ......... 2 & 7 No Continuity ....... 5 & 7 Continuity
3 & 6 ......... 1 & 7 No Continuity ....... 4 & 7 Continuity
(1) - All tests performed with power transistor disconnected. Replace
power transistor if it does not test as described.
(2) - See Fig. 8 for terminal identification.









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MAGNETIC & OPTICAL IGNITION
Ignition Coil Resistance
1) Using a DVOM, measure primary coil resistance between
positive and negative terminals of coil. See Fig. 9. For ignition coil
terminal identification See Fig. 11 - 13.
2) Measure secondary coil resistance between coil positive
terminal and ignition coil tower. See Fig. 10.
3) Primary and secondary coil resistance should be within
specification. See IGNITION COIL RESISTANCE table.
Fig. 9: Testing Ignition Coil Primary Resistance (6-Cylinder)
Courtesy of Mitsubishi Motor Sales of America.

CO M PU TE R R ELE A R N P R O CED URES

1991 M it s u bis h i M onte ro
GENERAL INFORMATION
Computer Relearn Procedures
All Models
* PLEASE READ THIS FIRST *
The following general procedures are to be used if
driveability problems are encountered after power loss or battery has
been disconnected. These procedures may provide an aid in eliminating
these problems.
To reduce the possibility of complaints, after any service
which requires battery power to be disconnected, vehicle should be
road tested.
COMPUTER RELEARN PROCEDURES
Vehicles equipped with engine or transmission computers may
require a relearn procedure after vehicle battery is disconnected.
Many vehicle computers memorize and store vehicle operation patterns
for optimum driveability and performance. When vehicle battery is
disconnected, this memory is lost. The computer will use default data
until new data from each key start is stored. As computer memorizes
vehicle operation for each new key start, driveability is restored.
Vehicle computers may memorize vehicles operation patterns for 40 of
more key starts.
Customers often complain of driveability problems during
relearn stage because vehicle acts differently then before being
serviced. Depending on type and make of vehicle and how it is
equipped, the following complaints (driveability problems) may exist:
* Harsh Or Poor Shift Quality
* Rough Or Unstable Idle
* Hesitation Or Stumble
* Rich Or Lean Running
* Poor Fuel Mileage
These symptoms and complaints should disappear after a number
of drive cycles have been memorized. To reduce the possibility of
complaints, after any service which requires battery power to be
disconnected, vehicle should be road tested. If a specific relearn
procedure is not available, the following procedure may be used:
Automatic Transmission
* Set parking brake, start engine in "P" or "N" position.
Warm-up vehicle to normal operating temperature or until
cooling fan cycles.
* Allow vehicle to idle for one minute in "N" position. Select
"D" and allow engine to idle for one minute.
* Accelerate at normal throttle position (20-50%) until vehicle
shifts into top gear.
* Cruise at light to medium throttle.
* Decelerate to a stop, allowing vehicle to downshift, and use
brakes normally.
* Process may be repeated as necessary.
Manual Transmission

CRUISE CONTROL SWITCH FUNCTION TEST
NOTE: If vehicle speed decreases approximately 9 MPH below set
speed, set speed will be cancelled.
1) Cruise control switch is part of multifunction switch
mounted on steering column. To operate cruise control system, turn
ignition on. Turn cruise control switch to ON position. Ensure switch
indicator light comes on.
NOTE: Speed will not set beyond system limit of 90 MPH.
2) With cruise control switch in ON position, drive vehicle
between 25 and 90 MPH. Press and release SET button. Vehicle speed
should stay at set speed. Instrument cluster cruise indicator light
should come on. To increase set speed, turn control switch to RESUME
position and hold until new set speed is reached.
3) To lower set speed, press SET button and hold until new
set speed is reached. To return to set speed after cancellation, move
resume switch from ON to OFF position. Vehicle speed should return to
previous setting before cancellation. Set speed should cancel when any
of the following occurs:
* Brake pedal is pressed.
* Clutch pedal is pressed.
* Transmission is shifted to Neutral or Park.
* Cruise control main switch is turned off.
* Ignition switch is turned off.
SELF-DIAGNOSTICS
1) Self-diagnostics should be performed when cruise control
cancels without the driver using normal cancel modes. Diagnosis
connector is located on right side of fuse box. Use analog voltmeter
or Multi-Use Tester (MB991341) for code retrieval.
2) Use multi-use tester according to operating instructions
provided with tester. Connect leads of analog voltmeter between cruise
control terminal and ground terminal of self-diagnostic connector. See
Fig. 6 . Read voltmeter needle sweeps to determine trouble code.
NOTE: On 1991 models, codes No. 13, 14, 15, 16 and 17 will be
displayed whether malfunction is present or not.
3) Once trouble codes have been displayed, see SELF-
DIAGNOSTIC CODE CHART to determine appropriate CIRCUIT TEST. See
Fig. 7 or 8.
4) To clear trouble codes, either disconnect battery cable or
turn ignition on. Turn main cruise control switch and set switch to ON
position. Within one second turn resume switch to ON position.
5) Hold stoplight switch and cruise control switch in ON
position for more than 5 seconds. Verify codes are cleared.
Fig. 6: Identifying Self-Diagnostic Connector Terminals
Courtesy of Mitsubishi Motor Co.

Test No. 1 (Power & Ground Circuit)
1) Turn ignition on. When cruise control main switch is
turned to ON position, battery voltage should be present on terminal
No. 7 of cruise control unit connector.
2) If voltage is not present, check fuse No. 3 and replace as
necessary. If fuse is okay, check and repair harness as necessary.
Terminal No. 10 should be grounded at all times. If terminal No. 10 is
not grounded, repair harness.
Test No. 2 (Set Switch Circuits)
When set switch is turned to ON position, voltage should not
be present on terminal No. 5 of cruise control unit. When set switch
is turned to OFF position, battery voltage should be present on
terminal No. 5 of cruise control unit. If circuit does not test
correctly, replace switch as necessary or repair harness.
Test No. 3 (Resume Switch Circuit)
When resume switch is turned to ON position, voltage should
not be present on terminal No. 4 of cruise control unit. When resume
switch is turned to OFF position, battery voltage should be present on
terminal No. 4 of cruise control unit. If circuit does not test
correctly, replace switch as necessary or repair harness.
Test No. 4 (Vehicle Speed Sensor Circuit)
When vehicle moves slowly, voltage should alternate from zero
volts to 3-5 volts at terminal No. 15 of cruise control unit. If
circuit does not test correctly, replace sensor as necessary or repair
harness.
Test No. 5 (Actuator Circuit)
1) When cruise control main switch is in On position, voltage
should not be present on terminal No. 8 of cruise control unit.
2) When vehicle is accelerated using resume switch, voltage
should not be present on terminal No. 9 of cruise control unit. When
vehicle is coasting by using set switch, battery voltage should be
present on terminal No. 9.
3) When vehicle is accelerated using resume switch, battery
voltage should be present on terminal No. 20 of cruise control unit.
When vehicle is coasting by using set switch, voltage should not be
present on terminal No. 20 of cruise control unit. If circuit does not
test correctly, replace actuator as necessary or repair harness.
Test No. 6 (Stoplight Switch Circuit)
1) When brake pedal is pressed, battery voltage should be
present on terminal No. 3 of cruise control unit. If voltage is not
present, adjust or replace brake switch.
2) Battery voltage should be present at all times on terminal
No. 11 of cruise control unit. If voltage is not present, check fuse
no. 7. If fuse is okay, repair harness.
Test No. 7 (Inhibitor Switch Circuit)
1) When gear shift lever is moved to Neutral or Park
position, voltage should not be present on terminal No. 2 of cruise
control unit.
2) When gear shift lever is moved to any other position,
battery voltage should be present on terminal No. 2 of cruise control
unit. If circuit does not test correctly, replace switch as necessary
or repair harness.
Test No. 8 (Clutch Switch Circuit)
When clutch pedal is pressed, battery voltage should be
present at terminal No. 1 of cruise control unit. If circuit does not

test correctly, replace switch as necessary or repair harness.
Test No. 9 (Overdrive Switch Circuit)
When overdrive switch is pushed to ON position, battery
voltage should be present on terminals No. 13 and 14 of cruise control
unit. If circuit does not test correctly, replace switch as necessary
or repair harness.
Fig. 17: 1991 Cruise Control Unit Connector
Courtesy of Mitsubishi Motor Co.
Fig. 18: 1991 Instrument Cluster Connector
Courtesy of Mitsubishi Motor Co.

Fig. 21: 1991 Acturator Connector
Courtesy of Mitsubishi Motor Co.
CIRCUIT TESTS (1992)
NOTE: To identify circuit connector terminals, See Figs. 22-29.
For wiring diagram, See appropriate chassis wiring diagram in
the WIRING DIAGRAMS Section.
Test No. 1 (Power & Ground Circuit)
1) Turn ignition on. When cruise control main switch is
turned to ON position, battery voltage should be present on terminal
No. 2 of cruise control unit connector.
2) If voltage is not present, check fuse No. 11 and replace
as necessary. If fuse is okay, check and repair harness as necessary.
Terminal No. 8 should be grounded at all times. If terminal No. 8 is
not grounded, repair harness.
Test No. 2 (Set Switch Circuits)
When set switch is turned to ON position, 3 volts should be
present on terminal No. 18 of cruise control unit. When set switch is
turned to OFF position, voltage should not be present on terminal No.
18 of cruise control unit. If circuit does not test correctly, replace
switch as necessary or repair harness.
Test No. 3 (Resume Switch Circuit)
When resume switch is turned to ON position, 6 volts should
be present on terminal No. 18 of cruise control unit. When resume
switch is turned to OFF position, voltage should not be present on
terminal No. 18 of cruise control unit. If circuit does not test
correctly, replace switch as necessary or repair harness.
Test No. 4 (Cancel Switch Circuit)
When cancel switch is turned to On position, battery voltage
should be present on terminal No. 18 of cruise control unit. When
cancel switch is in Off position, voltage should not be present on
terminal No. 18 of cruise control unit. If circuit does not test
correctly, replace switch as necessary or repair harness.