Mitsubishi Montero (1998+). Manual - part 85

lights, cooling fan and accessories off. Shift transmission into

Neutral or Park position.

         2) If not using scan tool, go to next step. Connect scan tool

to Data Link Connector (DLC). DLC is located below dash, near steering

column. See Fig. 2. Go to step 5).

         3) On DOHC models, insert a paper clip in engine speed

detection connector. See Fig. 3. On SOHC models, insert paper clip in

noise filter connector. See Fig. 5. On all models, connect a

tachometer to paper clip.

         4) Connect a jumper wire between ground and Data Link

Connector (DLC) terminal No. 1. See Fig. 2. Disconnect waterproof

female connector from Brown ignition timing check connector. See

Fig. 4. Using a jumper wire, ground ignition timing check terminal.

         5) Start engine and allow it to idle. Check basic idle speed.

See IDLE SPEED SPECIFICATIONS table. On DOHC models, multiply

tachometer reading by 3 to obtain actual basic idle speed. If idle

speed is not within specification, turn engine speed adjusting screw

until correct engine speed is obtained. See  Fig. 6. Access to speed

adjusting screw is obtained by removing rubber plug on throttle body.

         6) If idle speed cannot be lowered by turning engine speed

adjusting screw, determine if Throttle Position (TP) sensor has been

moved. Adjust TP sensor if necessary. See TP SENSOR ADJUSTMENT under

THROTTLE POSITION (TP) SENSOR. If TP sensor is okay, replace throttle

body.

Fig. 6:  Adjusting Idle Speed (Typical)

Courtesy of Mitsubishi Motor Sales of America

IDLE SPEED SPECIFICATIONS TABLE





























































Application               Curb Idle               Basic Idle

1.5L & 1.8L  ............  600-800  ...............  650-750

2.0L

  Non-Turbo  ............  700-900  ...................  ( 1)

  Turbo  ................  650-850  ...............  700-800

2.4L  ...................  650-850  ...............  700-800

3.0L & 3.5L  ............  600-800  ...............  650-750

(1) - Information is not available from manufacturer at time

      of publication.





























































NOTE:    Basic idle speed should only be adjusted after verifying

         spark plugs, fuel injectors, idle air control motor and

         engine compression are okay.

         All Other Models

         1) Ensure vehicle is at normal operating temperature with all

lights, cooling fan and accessories off. Shift transmission into

Neutral or Park position.

         2) Basic idle speed can only be adjusted using a scan tool to

ground Data Link Connector (DLC). Connect scan tool to DLC. DLC is

located below dash, near steering column. See  Fig. 2.

         3) Start engine and allow it to idle. Using scan tool, select

MFI SYSTEM ACTUATOR TEST, then select item 30. Check basic idle speed.

See IDLE SPEED SPECIFICATIONS table.

CAUTION: MFI system actuator test must be cancelled or test will

         continue to run for 27 minutes. Driving vehicle under this

         condition may damage engine.

         4) Cancel MFI system actuator test. If idle speed is not

within specification, turn engine speed adjusting screw until correct

engine speed is obtained. See Fig. 6. Access to speed adjusting screw

is obtained by removing rubber plug on throttle body.

         5) If idle speed cannot be lowered by turning engine speed

adjusting screw, determine if fixed Speed Adjusting Screw (SAS). Fixed

SAS is stop screw contacting throttle lever. See

FIXED SPEED ADJUSTING SCREW for procedure.

         6) After all adjustments are verified to be correct, possible

cause of incorrect idle speed is deterioration of Idle Air Control

(IAC) circuit. See DTC P0505 in G - TESTS W/CODES article.

         CURB (SLOW) IDLE SPEED

NOTE:    Curb idle speed is controlled by Idle Air Control (IAC)

         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. See

IGNITION TIMING. 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 IAC

system. See DTC P0505 in G - TESTS W/CODES article. If IAC system is

okay, adjust basic idle speed. See BASIC IDLE SPEED.

         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.

         1) Loosen throttle cable. Loosen fixed SAS lock nut. See

Fig. 7. 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.

Adjust Throttle Position (TP) sensor. See TP SENSOR ADJUSTMENT under

THROTTLE POSITION (TP) SENSOR.

Fig. 7:  Adjusting Fixed Speed Adjusting Screw (Typical)

Courtesy of Mitsubishi Motor Sales of America

         IDLE MIXTURE

NOTE:    Idle mixture is computer controlled on fuel injected engines

         and is nonadjustable. CO level should not exceed .5%. HC

         level should not exceed 100 ppm. If mixture levels exceed

         limits, see G - TESTS W/CODES article.

         THROTTLE POSITION (TP) SENSOR

         TP SENSOR ADJUSTMENT

NOTE:    Ensure basic idle speed is set to specification before

         adjusting TP sensor. 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.

         Eclipse 2.0L Non-Turbo

         1) TP sensor is not adjustable. Disconnect TP sensor

connector. Using external ohmmeter, measure resistance between TP

sensor terminals No. 1 and 3. See Fig. 8. If resistance is not 3500-

6500 ohms, replace TP sensor.

         2) While slowly rotating throttle valve from idle to full

open, measure resistance between TP sensor terminals No. 2 and 3. If

resistance does not change smoothly in proportion to throttle opening,

replace TP sensor.

         Montero

         1) Disconnect TP sensor connector. Using jumper wires,

connect an external ohmmeter between TP sensor terminals No. 1 and 2.

See Fig. 9. Insert .025" (.65 mm) feeler gauge between fixed speed

adjusting screw and throttle lever.

         2) Loosen TP sensor mounting screws and rotate TP sensor

fully clockwise. Ensure there is continuity between terminals No. 1

and 2. Rotate TP sensor counterclockwise until there is no continuity,

and tighten screws. Install Test Harness (MB991348) between TP sensor

and harness connector.

         3) Turn ignition on. Using external voltmeter, measure TP

sensor output voltage between terminals No. 1 and 3. If voltage is not

.4-1.0 volt, check harness and sensor. See DTC P0120 in G - TESTS

W/CODES article.

         All Other Models

         1) Disconnect TP sensor connector. Using jumper wires,

connect an external ohmmeter between TP sensor terminals No. 1 and 2

on Diamante or No. 3 and 4 on all other models. See  Fig. 9. On

Diamante and Mirage 1.8L with cruise control, insert .055" (1.40mm)

feeler gauge between fixed speed adjusting screw and throttle lever.

On Galant, insert .025" (.65 mm) feeler gauge between fixed speed

adjusting screw and throttle lever. On all other models, insert .018"

(.45 mm) feeler gauge between fixed speed adjusting screw and throttle

lever.

         2) Loosen TP sensor mounting screws and rotate TP sensor

fully counterclockwise. Ensure there is continuity between terminals

No. 1 and 2 on Diamante, or No. 3 and 4 on all other models. Rotate TP

sensor clockwise until there is no continuity and tighten screws.

Install Test Harness (MB991348) between TP sensor and harness

connector.

         3) Turn ignition on. Using external voltmeter, measure TP

sensor output voltage between terminals No. 1 and 3 on Diamante, or

No. 2 and 4 on all other models. If voltage is not .4-1.0 volt, check

harness and sensor. See DTC P0120 in G - TESTS W/CODES article.

Fig. 8:  TP Sensor Connector Terminals (Eclipse 2.0L Non-Turbo)

Courtesy of Mitsubishi Motor Sales of America