Mitsubishi Galant (2004+). Manual - part 1073

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1109

(5) When the fuel pump drive connector is attached directly 

to the battery, check if the sound of the fuel pump 
operation can be heard. If no operating sound is heard, 
replace the fuel pump module (Refer to GROUP 13C, 
On-vehicle Service 

− Fuel Pump Module Replacement 

P.13C-7

).

NOTE: As the fuel pump is an in-tank type, the fuel pump 
sound is hard to hear. Remove the fuel tank filler tube cap 
and check from the tank inlet.

(6) Check for fuel pressure by pinching the fuel hose with 

fingertips.

(7) Connect the fuel pump module connector.
(8) Install the hole cover (LH).

Tightening torque: 1.5 

± 0.5 N⋅m (14 ± 4 in-lb)

(9) Install the rear seat cushion assembly (Refer to GROUP 

52A, Rear Seat Assembly 

P.52A-30

).

MULTIPORT FUEL INJECTION (MFI) RELAY AND 
THROTTLE ACTUATOR CONTROL MOTOR 
RELAY CONTINUITY CHECK

M1131050000378

Inspect the MFI relay and throttle actuator control motor relay 
for continuity in accordance with the chart shown below.

1

2

3

4

5

AC305681

AC306089

1.5 ± 0.5 N·m
14 ± 4 in-lb

AE

HOLE COVER

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED TO 
BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

2 

− 3

Supplied

2 

−  3

1 

− 4

1 2
3 4

1 2
3 4

AK302151

MFI RELAY OR THROTTLE 
ACTUATOR CONTROL MOTOR
RELAY SIDE CONNECTOR

MFI RELAY  OR THROTTLE 
ACTUATOR CONTROL MOTOR 
RELAY SIDE CONNECTOR

AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1110

FUEL PUMP RELAY CONTINUITY CHECK

M1131033000386

Inspect the fuel pump relay for continuity in accordance with 
the chart shown below.

INTAKE AIR TEMPERATURE SENSOR CHECK

M1131002800591

1. Disconnect the mass airflow sensor connector.
2. Measure resistance between terminal No. 1 and No. 4.

Standard value:

13 

− 17 kΩ [at −20°C (−4°F)]

5.3 

− 6.7 kΩ [at 0°C (32°F)]

2.3 

− 3.0 kΩ [at 20°C (68°F)]

1.0 

− 1.5 kΩ [at 40°C (104°F)]

0.56 

− 0.76 kΩ [at 60°C (140°F)]

0.30 

− 0.45 kΩ [at 80°C (176°F)]

3. If not within specifications, replace the mass airflow sensor.
4. Measure resistance while heating the sensor using a hair 

dryer.

Normal condition:

5. If resistance does not decrease as heat increases, replace 

the mass airflow sensor.

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED TO 
BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

2 

− 3

Supplied

2 

−  3

1 

− 4

1 2
3

2

3 4

1

4

AK302122

FUEL PUMP RELAY
SIDE CONNECTOR

FUEL PUMP RELAY
SIDE CONNECTOR

AB

TEMPERATURE

RESISTANCE (k

Ω)

Higher

Smaller

1

2

3 4

AK203041

INTAKE AIR TEMPERATURE
SENSOR CONNECTOR

AB

AK203040 AB

INTAKE AIR 
TEMPERATURE 
SENSOR

MASS AIRFLOW 
SENSOR

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1111

ENGINE COOLANT TEMPERATURE SENSOR 
CHECK

M1131003100551

CAUTION

Be careful not to touch the connector (resin section) with 
the tool when removing and installing.
1. Drain engine coolant, then remove the engine coolant 

temperature sensor.

2. With the temperature sensing portion of engine coolant 

temperature sensor immersed in hot water, check the 
resistance.

Standard value:

14 

− 17 kΩ [at −20°C (−4°F)]

5.1 

− 6.5 kΩ [at 0°C (32°F)]

2.1 

− 2.7 kΩ [at 20°C (68°F)]

0.9 

− 1.3 kΩ [at 40°C (104°F)]

0.48 

− 0.68 kΩ [at 60°C (140°F)]

0.26 

− 0.36 kΩ [at 80°C (176°F)]

3. If resistance deviates from the standard value greatly, 

replace the sensor.

4. Apply 3M

 AAD part number 8731 or equivalent to threaded 

portion.

5. Install the engine coolant temperature sensor and tighten it 

to the specified torque.

Tightening torque: 30 

± 9 N⋅m (22 ± 7 ft-lb)

HEATED OXYGEN SENSOR CHECK

M1131005000732

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MD998464: Test Harness

• MB991316: Test Harness

.

<Heated oxygen sensor (rear)>
1. Using the scan tool MB991958, observe HO

2

S reading. If 

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

AKX01622

AKX01623 AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1112

(1) Disconnect the heated oxygen sensor connector and 

connect special tool MD998464 to the connector on the 
heated oxygen sensor side.

(2) Make sure that there is continuity [11 

− 18 ohms at 20°C 

(68

°F)] between terminal No. 1 (red clip) and terminal No. 

3 (blue clip) 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 revving 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 heated oxygen 
sensor.

• Be careful the heater is broken when voltage of beyond 

12 volts is applied to the heated oxygen sensor heater.

NOTE: If the sufficiently high temperature [of approximate 
400

°

C (752

°

F) or more] is not reached although the heated 

oxygen sensor is normal, the output voltage would be possi-
bly low although the rich air/fuel ratio. Therefore, if the out-
put voltage is low, use jumper wires to connect the terminal 
No. 1 (red clip) and the terminal No. 3 (blue clip) of the 
heated oxygen sensor with a (+) terminal and (-) terminal of 
12 volts power supply respectively, then check again.

3. If the output voltage is not within the standard value, 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.15-21

.

.

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

MB991316

WHITE

BLACK

AN