Mitsubishi Eclipse. Manual - part 642

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1111

(2) Make sure that there is continuity [4.5 

− 8.0 ohms at 20°C 

(68

°F)] between terminal No. 1 (red clip of special tool) 

and terminal No. 3 (blue clip of special tool) on the heated 
oxygen sensor connector.

(3) If there is no continuity, replace the heated oxygen 

sensor.

(4) Warm up the engine until engine coolant is 80

°C (176°F) 

or higher.

(5) Perform a tracing for 5 minutes or more with the engine 

speed of 4,500 r/min.

(6) Connect a digital voltage meter between terminal No. 2 

(black clip) and terminal No. 4 (white clip).

2. While repeatedly revving the engine, measure the heated 

oxygen sensor output voltage.

Standard value:

CAUTION

• Be very careful when connecting the jumper wire; 

incorrect connection can damage the oxygen sensor.

• Be careful the heater is broken when voltage of beyond 

8V is applied to the oxygen sensor heater.

NOTE: If the sufficiently high temperature (of approximate 
400

°

C or more) is not reached although the oxygen sensor is 

normal, the output voltage would be possibly low although the 
rich air-fuel ratio. Therefore, if the output voltage is low, use a 
jumper wire to connect the terminal No.1 (red clip of special 
tool) and the terminal No. 3 (blue clip of special tool) of the oxy-
gen sensor with a (+) terminal and (-) terminal of 8 V power 
supply respectively, then check again.
3. If the sensor is defective, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sen-
sor, refer to GROUP 15, Exhaust Pipe and Main Muffler 

P.15-24

.

.

<Right bank and left bank heated oxygen sensor (rear)>
1. Use scan tool MB991958, observe HO2S reading. If values 

are unsatisfactory, or if the scan tool is not available, use the 
following procedure:

(1) Disconnect the heated oxygen sensor connector and 

connect special tool MB991316 to the connector on the 
heated oxygen sensor side.

ENGINE

HEATED OXYGEN 
SENSOR OUTPUT 
VOLTAGE

REMARKS

When revving 
engine

0.6 

− 1.0 volt

If you make the air/fuel 
ratio rich by revving the 
engine repeatedly, a 
normal heated oxygen 
sensor will output a 
voltage of 0.6 

− 1.0 volt.

AKX01624

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

MD998464

BLUE

RED

AC

AKX01624

HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR

MD998464

WHITE

BLACK

AL

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1112

(2) Make sure that there is continuity [11 

− 18 ohms at 20°C 

(68

°F)] between terminal No. 1 (red clip of special tool) 

and terminal No. 3 (blue clip of special tool) on the heated 
oxygen sensor connector.

(3) If there is no continuity, replace the heated oxygen 

sensor.

(4) Warm up the engine until engine coolant is 80

°C (176°F) 

or higher.

(5) Perform a tracing for 5 minutes or more with the engine 

speed of 4,500 r/min.

(6) Connect a digital voltage meter between terminal No. 2 

(black clip) and terminal No. 4 (white clip).

2. While repeatedly revving the engine, measure the heated 

oxygen sensor output voltage.

Standard value:

CAUTION

• Be very careful when connecting the jumper wire; 

incorrect connection can damage the oxygen sensor.

• Be careful the heater is broken when voltage of beyond 

8V is applied to the oxygen sensor heater.

NOTE: If the sufficiently high temperature (of approximate 
400

°

C or more) is not reached although the oxygen sensor is 

normal, the output voltage would be possibly low although the 
rich air-fuel ratio. Therefore, if the output voltage is low, use a 
jumper wire to connect the terminal No.2 and the terminal No. 1 
of the oxygen sensor with a (+) terminal and (-) terminal of 8 V 
power supply respectively, then check again.
3. If the sensor is defective, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sen-
sor, refer to GROUP 15, Exhaust Pipe and Main Muffler 

P.15-24

.

INJECTOR CHECK

M1131005200457

.

<Right bank side (number 1, 3, 5 cylinders)>
1. Disconnect the injector intermediate connector.

ENGINE

HEATED OXYGEN 
SENSOR OUTPUT 
VOLTAGE

REMARKS

When revving 
engine

0.6 

− 1.0 volt

If you make the air/fuel 
ratio rich by revving the 
engine repeatedly, a 
normal heated oxygen 
sensor will output a 
voltage of 0.6 

− 1.0 volt.

AKX01624 AB

MB991316

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

BLUE

RED

AK301461

HEATED OXYGEN SENSOR

AB

MB991658

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1113

2. Measure the resistance between the injector intermediate 

connector terminals.

Standard value:

3. Connect the injector intermediate connector.

.

<Left bank side (number 2, 4, 6 cylinders)>
1. Disconnect the injector connector.
2. Measure the resistance between injector side connector 

terminals 1 and 2.

Standard value: 13 

− 16 ohms [at 20 °C (68°F)]

3. Connect the injector connector.

IDLE AIR CONTROL MOTOR (STEPPER MOTOR) 
CHECK

M1131005400536

Refer to On-vehicle Service 

− Idle Air Control Motor (Stepper 

Motor) Check 

P.13A-940

.

EVAPORATIVE EMISSION PURGE SOLENOID 
CHECK

M1131005600217

Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission System 

− Evaporative Emission Purge Solenoid 

Check 

P.17-107

.

EGR VACUUM REGULATOR SOLENOID VALVE 
CHECK

M1131005700225

Refer to GROUP 17, Emission Control System 

− Exhaust Gas 

Recirculation (EGR) System - EGR Vacuum Regulator Sole-
noid Valve Check 

P.17-115

.

EVAPORATVE EMISSION VENTILATION 
SOLENOID CHECK

M1131012800213

Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission Canister and Fuel Tank Pressure Relief Valve 

− Fuel 

Tank Pressure Relief Valve Inspection 

P.17-118

.

INJECTOR NO.

MEASUREMENT 
TERMINAL

RESISTANCE

NO.1

1-2

13 

− 16 ohms 

[20

°C (68°F)]

NO.3

1-3

NO.5

1-4

AK000125

1
3 4

2

AB

AK000126

INJECTOR

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1114

INJECTOR

REMOVAL AND INSTALLATION

M1131007100683

REMOVAL SERVICE POINT

.

<<A>> FUEL RAIL/INJECTORS REMOVAL

CAUTION

Do not drop the injector.
Remove the fuel rail with the injectors attached to it.

Pre-removal Operation
• Fuel Pressure Reduction (Refer to 

P.13B-1109

.)

• Engine Coolant Draining [Refer to GROUP 00, Mainte-

nance Service 

− Engine Coolant (Change) 

P.00-58

.]

• Intake Manifold Plenum Removal (Refer to GROUP 15, 

Intake Manifold Plenum 

P.15-7

.)

Post-installation Operation
• Intake Manifold Plenum Installation (Refer to GROUP 15, 

Intake Manifold Plenum 

P.15-7

.)

• Engine Coolant Refilling [Refer to GROUP 00, Mainte-

nance Service 

− Engine Coolant (Change) 

P.00-58

.]

• Fuel Leakage Inspection

AC001623

1

2

4

5

6

7

8

9

9

9

9

10

11

12

13

11

12

13

10

1

8

2, 6

3, 7

12

11

N

N

N

N

N

N

N

12 ± 1 N·m
100 ± 13 in-lb

4.9 ± 1.0 N·m
44 ± 8 in-lb

8.8 ± 1.0 N·m
78 ± 9 in-lb

ENGINE OIL

AB

3

N

REMOVAL STEPS

1.

INJECTOR CONNECTOR

>>A<<

2.

FUEL HIGH-PRESSURE HOSE 
CONNECTION

3.

O-RING

4.

FUEL RETURN HOSE 
CONNECTION

5.

VACUUM HOSE CONNECTION

>>A<<

6.

FUEL PRESSURE REGULATOR

7.

O-RING

<<A>>

8.

FUEL RAIL

9.

INSULATORS

10. INSULATORS

<<A>> >>A<<

11. INJECTORS
12. O-RING
13. GROMMETS

REMOVAL STEPS (Continued)