1991 MITSUBISHI MONTERO throttle position

2.0L .............................. Yellow/Red ............. (5)\
Montero
3.0L ............................. White/Yellow ............ (4)\
Pickup & Ram-50
2.4L .............................. Black/Blue ............. (6)\
3.0L ............................. White/Yellow ............ (6)\
Stealth (SOHC)
3.0L ............................. White/Yellow ............ (4)\
Stealth & 3000GT (DOHC)
3.0L (Non-Turbo) ................. Black/Green ............. (4\
)
3.0L (Turbo) ..................... White/Yellow ............ (4\
)
(1) - Remove waterproof female connector (if equipped) for access to\
wire.
(2) - Ground connector at wire end for basic timing adjustment.
(3) - On main wiring harness, near center of firewall.
(4) - On main wiring harness, near wiper motor on firewall.
(5) - On main wiring harness, near master cylinder on firewall.
(6) - Between right shock tower and firewall.
(7) - Near front of right shock tower.









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IDLE SPEED & MIXTURE
NOTE: Perform adjustments with engine at normal operating
temperature, cooling fan and accessories off, transmission
in Park or Neutral, and front wheels in straight-ahead
position.
CURB (SLOW) IDLE SPEED
NOTE: Curb idle speed is controlled by Idle Speed Control (ISC)
motor. Adjustment is usually not necessary. For curb idle
speed specifications, see IDLE SPEED SPECIFICATIONS table
under BASIC IDLE SPEED.
1) Check ignition timing and adjust if necessary. Run engine
at 2000-3000 RPM for more than 5 seconds. Allow engine to idle for 2
minutes. Check curb idle speed.
2) If curb idle speed is not within specification, check ISC
system. If ISC system is okay, adjust basic idle speed. See BASIC IDLE
SPEED.
BASIC IDLE SPEED
NOTE: ALWAYS check TPS adjustment after adjusting basic idle
speed. See THROTTLE POSITION SENSOR (TPS).
BASIC IDLE SPEED TEST APPLICATION TABLE









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Application Test
1.5L
Colt, Colt 200,
Mirage & Summit ............. TEST NO. 1
1.6L
Mirage ....................... TEST NO. 2
1.8L
Eclipse ...................... TEST NO. 1
2.0L (VIN V)
Colt Vista & Galant .......... TEST NO. 1
2.0L (VIN R & U)

Eclipse & Galant ............. TEST NO. 2
2.4L
Pickup & Ram-50 .............. TEST NO. 1
3.0L
Montero, Pickup, Ram-50,
Stealth & 3000GT ............ TEST NO. 2









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Test No. 1
1) Loosen throttle cable. Turn ignition on for more than 15
seconds. DO NOT start engine. Turn ignition off. This should fully
retract ISC motor plunger.
2) On 2.0L Galant (VIN V), connect jumper wire between
ignition timing adjustment connector and ground. See IGNITION TIMING
ADJUSTMENT CONNECTOR LOCATION table under IGNITION TIMING.
3) On all models, disconnect harness connector(s) from Idle
Speed Control (ISC) motor. Ensure ISC plunger is in fully retracted
position. Unscrew fixed Speed Adjusting Screw (SAS) until throttle
valve is fully closed. See Fig. 1.
CAUTION: When cleaning throttle body, plug air by-pass hole in
throttle body to prevent solvent from entering passage.
4) Start engine. Check basic idle speed. See IDLE SPEED
SPECIFICATIONS table. If basic idle speed is within specification, go
to step 7). If basic idle speed is not within specification, remove
air intake hose and clean throttle body. Reconnect air intake hose.
Recheck basic idle speed.
5) If basic idle speed is still not within specification
after cleaning throttle body, adjust basic idle speed by turning idle
speed adjusting screw. See Fig. 1. After adjusting basic idle speed,
turn fixed SAS screw clockwise until engine speed begins to increase.
6) Turn fixed SAS screw counterclockwise until engine speed
decreases. Turn fixed SAS screw counterclockwise an additional 1/2
turn from point at which engine speed no longer decreases. Turn off
engine.
7) Adjust throttle cable. Reconnect harness connector(s) at
ISC motor. Start engine. Operate engine for about 5 minutes. Ensure
engine idles within curb idle speed specification. See IDLE SPEED
SPECIFICATIONS table.
8) Turn ignition off. Disconnect negative battery cable for
at least 10 seconds to clear diagnostic trouble code. Reconnect
negative battery cable. Operate engine at idle for about 5 minutes to
ensure engine idles smoothly.
Test No. 2
1) Locate ignition timing adjustment connector. See IGNITION
TIMING ADJUSTMENT CONNECTOR LOCATION table under IGNITION TIMING.
Connect jumper wire between ignition timing adjustment connector and
ground.
2) Locate diagnostic connector under instrument panel.
Connect jumper wire between diagnostic connector terminal No. 10
(White wire) and ground. See Fig. 3. Start engine. Check basic idle
speed. See IDLE SPEED SPECIFICATIONS table. If basic idle speed is
within specification, go to step 9). If basic idle speed is not within
specification, go to step 3).
3) Remove air intake hose. Check throttle body. If throttle
body contains deposits, go to next step. If throttle body is clean,
disconnect jumper wires connected in steps 1) and 2). On all models
except Eclipse, Galant and Mirage, go to step 6). On Eclipse, Galant
and Mirage, go to step 5).
CAUTION: When cleaning throttle body, plug air by-pass hole in

throttle body to prevent solvent from entering passage.
4) Clean throttle body with solvent. Replace air intake hose.
Recheck basic idle speed. If basic idle speed is within specification
after cleaning throttle body, go to step 9). If basic idle speed is
still not within specification after cleaning throttle body,
disconnect jumper wires connected in steps 1) and 2). On all models
except Eclipse, Galant and Mirage, go to step 6). On Eclipse, Galant
and Mirage, go to step 5).
5) Adjust idle position switch and go to step 7). See IDLE
POSITION SWITCH under THROTTLE POSITION SENSOR (TPS).
6) Adjust fixed Speed Adjusting Screw (SAS) and go to next
step. See FIXED SPEED ADJUSTING SCREW under IDLE SPEED & MIXTURE.
7) Reconnect jumper wires as indicated in steps 1) and 2).
Check basic idle speed. If basic idle speed is within specification,
go to step 9). If basic idle speed is not within specification, adjust
by turning idle speed adjusting screw on throttle body. See Fig. 2. Go
to next step.
8) If basic idle speed is within specification after turning
idle speed adjusting screw, go to step 9). If basic idle speed cannot
be adjusted to specification by turning idle speed adjusting screw,
check for leaking fast idle air valve. Replace throttle body if fast
idle air valve leaks.
9) Turn ignition off. Disconnect jumper wires from ignition
timing adjustment connector and diagnostic connector. Operate engine
at idle for about 5 minutes. Ensure engine idles smoothly and within
curb idle specification. See IDLE SPEED SPECIFICATIONS table.
IDLE SPEED SPECIFICATIONS TABLE









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Application Curb Idle Basic Idle
1.5L
Colt, Colt 200,
Mirage & Summit .... 650-850 ...... 700-800
1.6L
Mirage .............. 650-850 ...... 700-800
1.8L
Eclipse ............. 600-800 ...... 650-750
2.0L (VIN V)
Colt Vista .......... 600-800 ...... 650-750
Galant .............. 650-850 ...... 700-800
2.0L (VIN R & U)
Eclipse ............. 650-850 ...... 650-750
Galant .............. 650-850 ...... 700-800
2.4L
Pickup & Ram-50 ..... 650-850 ...... 700-800
3.0L
Montero, Pickup, Ram-50,
Stealth & 3000GT . 600-800 ...... 650-750









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Fig. 1: Idle & Fixed Speed Adj. Screws (1.5L, 1.8L, 2.0L (VIN V)
& 2.4L)

NOTE: Fixed Speed Adjusting Screw (SAS) is preset by manufacturer
and usually does not require adjustment. Only adjust fixed
SAS if other adjustment procedures require it, or if
manufacturer's original setting has been changed.
3.0L Montero, Pickup, Ram-50, Stealth & 3000GT
1) Loosen throttle cable. Loosen fixed SAS lock nut. See
Fig. 4. Turn fixed SAS counterclockwise until throttle valve is fully
closed. Turn fixed SAS clockwise until throttle valve begins to open.
Turn fixed SAS clockwise 1 1/4 turns after throttle valve begins to
open.
2) Tighten lock nut while holding fixed SAS in position.
Adjust throttle cable. Adjust basic idle speed. See BASIC IDLE SPEED
under IDLE SPEED & MIXTURE. Adjust throttle position sensor. See
THROTTLE POSITION SENSOR (TPS).
All Other Models
To adjust fixed SAS, adjust basic idle speed. See BASIC IDLE
SPEED under IDLE SPEED & MIXTURE.
Fig. 4: Fixed Speed Adj. Screw & Feeler Gauge Pos. (3.0L)
Courtesy of Mitsubishi Motor Sales of America.
IDLE MIXTURE

NOTE: Idle mixture is computer controlled on fuel injected engines
and is nonadjustable. CO level specifications are not
available from manufacturer.
THROTTLE POSITION SENSOR (TPS)
TPS ADJUSTMENT
NOTE: Ensure basic idle speed is set to specification before
adjusting TPS. See BASIC IDLE SPEED under IDLE SPEED &
MIXTURE. Perform all adjustments with engine at normal
operating temperature, front wheels in straight-ahead
position, cooling fan and all accessories off, and
transmission in Park or Neutral.
TPS TEST APPLICATION









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Application Test
1.5L
Colt, Colt 200,
Mirage & Summit ............. TEST NO. 1
1.6L
Mirage ....................... TEST NO. 2
1.8L
Eclipse ...................... TEST NO. 3
2.0L (VIN V)
Colt Vista & Galant .......... TEST NO. 1
2.0L (VIN R & U)
Galant ....................... TEST NO. 1
Eclipse ...................... TEST NO. 3
2.4L
Pickup & Ram-50 .............. TEST NO. 1
3.0L
Montero, Pickup & Ram-50 ..... TEST NO. 4
Stealth & 3000GT ............. TEST NO. 5









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Test No. 1
1) Turn ignition on for more than 15 seconds. DO NOT start
engine. Turn ignition off. ISC plunger should be retracted fully.
2) Ensure ISC plunger is in fully retracted position.
Disconnect harness connector(s) from ISC motor. Turn ignition on. DO
NOT start engine.
3) Using digital voltmeter, backprobe terminal No. 19
(Green/White wire) and terminal No. 24 (Black or Green/Black wire) a\
t
Engine Control Unit (ECU) wiring harness connector. Note TPS output
voltage.
4) If output voltage is .48-.52 volt, go to step 6). If
output voltage is not .48-.52 volt, loosen TPS mounting screw(s) and
rotate TPS clockwise, or counterclockwise, until output voltage is
within specification. Tighten TPS mounting screws.
5) Turn ignition off. Reconnect harness connector(s) at ISC
motor. Start engine. Ensure engine idles within curb idle speed
specification.
6) Turn ignition off. Disconnect negative battery cable for
at least 15 seconds to clear diagnostic trouble code. Reconnect
negative battery cable. Operate engine at idle for about 5 minutes to
ensure engine idles smoothly.
Test No. 2
1) Turn ignition on. DO NOT start engine. Loosen throttle

Adjusting Screw (SAS) and throttle lever. See Fig. 4. Loosen TPS
mounting screws. Rotate TPS fully counterclockwise. Check for
continuity between Yellow/Red wire and Black wire terminals of TPS.
3) Rotate TPS clockwise until ohmmeter registers no
continuity. Tighten TPS mounting screws. Reconnect TPS electrical
connector.
4) Use a digital voltmeter to backprobe terminal No. 19
(Brown/Red wire) and terminal No. 24 (Brown wire) at Engine Control
Unit (ECU) wiring harness on SOHC vehicles, or terminal No. 64
(Brown/Red wire) and terminal No. 72 (Black wire) on DOHC vehicles.
Turn ignition on. DO NOT start engine. Check TPS output voltage.
5) If TPS output voltage is 0.4-1.0 volt, go to step 6). If
TPS output voltage is not 0.4-1.0 volt, check TPS and wiring harness
for damage or malfunction. Replace TPS or repair wiring harness if
necessary and go to step 6).
6) Remove feeler gauge. Turn ignition off. Disconnect
voltmeter from ECU connector. Operate engine at idle for about 5
minutes to ensure engine idles smoothly and within specification.
IDLE POSITION SWITCH
NOTE: Idle position switch is preset by manufacturer. Adjustment
is usually not necessary. If other procedures in this
article require adjustment of idle position switch or if
switch setting has been changed, adjust switch as follows.
1.6L Mirage, 2.0L Eclipse & 2.0L Galant (DOHC)
1) Loosen throttle cable. Disconnect electrical connector
from idle position switch. See Fig. 5. Loosen lock nut at base of
switch. Turn switch counterclockwise until throttle valve is fully
closed.
2) Connect ohmmeter between switch terminal and switch body
(ground). Turn idle position switch clockwise until ohmmeter registers\
continuity. At this point, throttle valve should begin to open.
3) Turn switch 15/16 of a turn beyond contact point. Tighten
lock nut at base of idle position switch, holding switch to prevent it
from turning while tightening.
4) Adjust throttle cable. Adjust basic idle speed. See BASIC
IDLE SPEED. Adjust TPS. See TPS ADJUSTMENT.
All Other Models
Idle position switch is incorporated in ISC motor and is
automatically adjusted when TPS is adjusted. See TPS ADJUSTMENT.
Fig. 5: Idle Position Switch Location (1.6L & 2.0L (VIN R &U))
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

Test No. 5 (Vehicle Speed Sensor Circuit)
When vehicle moves slowly, 0-2 or more volts should alternate
at terminal No. 19 of cruise control unit. If circuit does not test
correctly, replace sensor as necessary or repair harness.
Test No. 6 (Vacuum Pump Circuit)
1) When cruise system is in deceleration or release mode,
battery voltage should be present on terminals No. 26 and 13 of cruise
control unit. If circuit does not test correctly, replace vacuum pump
as necessary or repair harness.
2) When cruise system is in release mode, battery voltage
should be present on terminal No. 12 of cruise control unit. When
cruise system is in hold mode, voltage on terminals No. 12, 13 and 26
will go from battery voltage to zero volts depending on driving
conditions. If circuit does not test correctly, replace vacuum pump as
necessary or repair harness.
Test No. 7 (Stoplight Switch Circuit)
When brake pedal is pressed, battery voltage should be
present on terminal No. 15 of cruise control unit. If voltage is not
present, adjust or replace brake switch. 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 (Inhibitor Switch Circuit)
When transmission is in Neutral position, battery voltage
should be present on terminal No. 1 of cruise control unit. If circuit
does not test correctly, replace switch as necessary or repair
harness.
Test No. 10 (Overdrive Switch Circuit)
When overdrive switch is pushed to ON position, battery
voltage should be present on terminal No. 11 of cruise control unit.
If circuit does not test correctly, replace switch as necessary or
repair harness.
Test No. 11 (Idle Switch & Throttle Position Sensor Circuit)
1) When accelerator pedal is pressed, 4.5-5.5 volts should be
present on terminal No. 4 (idle switch) of cruise control unit. When
accelerator pedal is released, voltage should not be present on
terminal No. 4 of cruise control unit.
2) When accelerator pedal is pressed to wide open throttle,
4.0-5.5 volts should be present on terminal No. 5 (throttle position
sensor) of cruise control unit. When accelerator pedal is released, .
5-.7 volts should be present on terminal No. 5 of cruise control unit.
If circuit does not test correctly, replace sensor as necessary or
repair harness.
Fig. 22: 1992 Cruise Control Unit Connector
Courtesy of Mitsubishi Motor Co.