Mitsubishi Galant 9G. Manual — part 922

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1130

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-1131

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-1132

(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.15-20

.

.

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

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1133

<Heated oxygen sensor (front)>

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:

(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 [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 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

8 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
8 volts power supply respectively, then check again.

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

AKX01624

HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR

MB991316

WHITE

BLACK

AN