Mitsubishi Galant (2004+). Manual - part 1361

 

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Mitsubishi Galant (2004+). Manual - part 1361

 

 

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1137

FUEL PUMP RELAY CONTINUITY CHECK

M1131033000342

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

INTAKE AIR TEMPERATURE SENSOR CHECK

M1131002800557

1. Disconnect the mass airflow sensor connectors.
2. Measure resistance between terminals 1 and 4.

Standard value:

13 

 17 k [at -20°C (-4°F)]

5.3 

 6.7 k [at 0°C (32°F)]

2.3 

 3.0 k [at 20°C (68°F)]

1.0 

 1.5 k [at 40°C (104°F)]

0.56 

 0.76 k [at 60°C (140°F)]

0.30 

 0.45 k [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

− 3

Supplied

−  3

− 4

1 2
3

2

3 4

1

4

AK302122

FUEL PUMP RELAY
SIDE CONNECTOR

FUEL PUMP RELAY
SIDE CONNECTOR

AB

TEMPERATURE

RESISTANCE (k

)

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) <3.8L ENGINE>

13B-1138

ENGINE COOLANT TEMPERATURE SENSOR 
CHECK

M1131003100528

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 k [at -20°C (-4°F)]

5.1 

 6.5 k [at 0°C (32°F)]

2.1 

 2.7 k [at 20°C (68°F)]

0.9 

 1.3 k [at 40°C (104°F)]

0.48 

 0.68 k [at 60°C (140°F)]

0.26 

 0.36 k [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: 29 

± 10 Nm (22 ± 7 ft-lb)

HEATED OXYGEN SENSOR CHECK

M1131005000691

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991316: Test Harness 

• MD998464: Test Harness

.

AKX01622

AKX01623 AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1139

<Right bank and left bank heated oxygen sensor (front)>
1. Using scan tool MB991958, observe HO

2

S reading. If 

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

(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 [4.5-8.0 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 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 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 V

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 V.

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) <3.8L ENGINE>

13B-1140

<Right bank and left bank heated oxygen sensor (rear)>
1. Using scan tool MB991958, observe HO

2

S reading. If 

values are unsatisfactory, or if 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.

(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 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.

3. If the output voltage is not within the standard value, replace 

the heated oxygen sensor.

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 12 V 
power supply respectively, then check again.
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 V

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 V.

AKX01624 AB

MB991316

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

BLUE

RED

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

 

 

 

 

 

 

 

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