Mitsubishi Montero (1991+). Manual — part 36
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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
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
Fig. 1: Idle & Fixed Speed Adj. Screws (1.5L, 1.8L, 2.0L (VIN V)
& 2.4L)
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Courtesy of Mitsubishi Motor Sales of America.
Fig. 2: Idle Speed Adj. Screw (1.6L, 2.0L (VIN R & U) & 3.0L)
Courtesy of Mitsubishi Motor Sales of America.
Fig. 3: Identifying Diagnostic Connector Terminal
Courtesy of Mitsubishi Motor Sales of America.
FIXED SPEED ADJUSTING SCREW
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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
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
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) at
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
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