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Mitsubishi Montero (1991+). Manual - part 36

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)

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

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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