Mitsubishi Eclipse. Manual - part 640

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1103

8. Attach the air intake hose.
9. Use the scan tool to erase any diagnostic trouble code.
10.Adjust the basic idle speed. (Refer to 

P.13B-1105

.)

WARNING

Battery posts, terminals and related accessories con-
tain lead and lead compounds. WASH HANDS AFTER 
HANDLING.

NOTE: If the engine hunts while idling after adjustment of 
the basic idle speed, disconnect the negative cable from the 
battery for 10 seconds or more, and then reconnect it and 
run the engine at idle for about 10 minutes after the engine 
is warmed up.

THROTTLE POSITION SENSOR ADJUSTMENT

M1131001100533

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MB991348: Test Harness

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1104

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector. 

When not using the scan tool, proceed as follows.

(1) Disconnect the throttle position sensor connector, and 

connect the special tool MB991348 in between. (All 
terminals should be connected.)

(2) Connect a digital voltmeter between throttle position 

sensor terminal No. 3 (sensor output) and terminal No. 1 
(sensor ground).

2. Turn the ignition switch to the "ON" position (but do not start 

the engine).

3. Check the throttle position sensor output voltage.

Standard value: 535 

− 735 millivolts

4. If not within the standard value range, adjust by loosening 

throttle position sensor mounting bolts and turning the 
throttle position sensor body. After adjusting, tighten the 
bolts securely.

5. Turn the ignition switch to the "LOCK" (OFF) position.
6. Disconnect scan tool MB991958, and connect the throttle 

position sensor connector. When the scan tool is not used, 
remove special tool MB991348, and connect the throttle 
position sensor connector.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

ACX02484

THROTTLE POSITION
SENSOR 

AE

AKX01636AB

TERMINAL 3
(SENSOR OUTPUT)

TERMINAL 1
(SENSOR 
 GROUND)

MB991348

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1105

BASIC IDLE SPEED ADJUSTMENT

M1131001800587

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

NOTE: The standard idling speed has been adjusted with the 
speed adjusting screw (SAS), by the manufacturer. There 
should be no need for readjustment.
NOTE: If the adjustment has been changed by mistake, the idle 
speed may become too high or the idle speed may drop too low 
when loads A/C, defogger, etc. are placed on the engine. If this 
occurs, adjust by the following procedure.
NOTE: The adjustment, if made, should be made after first con-
firming that the spark plugs, the injectors, the idle air control 
motor, compression, etc., are all normal.
1. The vehicle should be prepared as follows before the 

inspection and adjustment.

• Engine coolant temperature: 80 − 95°C (176 − 203°F)

• Lights, electric cooling fan and accessories: OFF

• Transaxle: Neutral ("P" range on vehicle with A/T)

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
2. Connect scan tool MB991958 to the data link connector 

(16-pin).

3. Start the engine and run at idle.
4. Select the item number 30 of the scan tool Actuator test.

NOTE: Use the scan tool to hold the IAC motor at the basic 
step to adjust the basic idle speed.

5. Check the idle speed.

NOTE: The engine speed may be 20 to 100 r/min lower than 
indicated above for a new vehicle [driven approximately 500 
km (300 mile) or less], but no adjustment is necessary.
NOTE: If the engine stalls or the engine speed is low even 
though the vehicle has been driven approximately 500 km 
(300 mile) or more, it is probable that deposits are adhered 
to the throttle valve, so clean it. (Refer to 

P.13B-1102

 .)

Standard value: 700 

± 50 r/min

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1106

6. If not within the standard value range, turn the speed 

adjusting screw (SAS) to make the necessary adjustment.

7. Press the scan tool clear key, and release the IAC motor 

Actuator test mode.

8. Turn the ignition switch to the "LOCK" (OFF) position.

NOTE: Unless the IAC motor is released, the Actuator test 
mode will continue for 27 minutes.

9. Disconnect scan tool MB991958.
10.Start the engine again and let it idle for about 10 minutes. 

Check that the idling condition is normal.

FUEL PRESSURE TEST

M1131001900506

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MB991637: Fuel Pressure Gauge Set

• MD998709: Adaptor Hose

• MD998742: Hose Adaptor

1. Release residual pressure from the fuel line to prevent fuel 

spray. (Refer to 

P.13B-1109

 .)

WARNING

To prevent a fire, cover the hose connection with 
shop towels to prevent splashing of fuel that could be 
caused by some residual pressure in the fuel pipe 
line.

2. Disconnect the fuel high-pressure hose at the fuel rail side.
3. Assemble the fuel pressure measurement tools as follows.

<When using the fuel pressure gauge>

1. Remove the union joint and bolt from special tool 

MD998709 (adaptor hose) and instead attach special tool 
MD998742 (hose adaptor) to the adaptor hose.

2. Place a suitable O-ring or gasket on the assembled special 

tools MD998709 and MD998742 and install the fuel pres-
sure gauge.

3. Install the assembled fuel pressure measurement tools 

between the fuel rail and fuel high-pressure hose.

AK000115AB

SPEED ADJUSTING SCREW

AK000117AB

HIGH-PRESSURE
FUEL HOSE

AKX01457AB

FUEL PRESSURE 
GAUGE

O-RING OR GASKET

MD998709

MD998742

HIGH-PRESSURE
FUEL HOSE

FUEL 
RAIL