Mitsubishi Lancer Evolution X. Manual - part 452

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-873

INJECTOR RELAY CONTINUITY CHECK

M1131054600264

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

THROTTLE ACTUATOR CONTROL MOTOR 
RELAY CONTINUITY CHECK

M1131054900027

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

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

1 − 2

Supplied

1 − 2

3 − 4

AK703720

1

2

3
4

1

2

3
4

AB

Injector relay
side connector

Injector relay
side connector

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

1 − 2

Supplied

1 − 2

3 − 4

AK703720

1

2

3
4

1

2

3
4

AC

Throttle actuator
control motor relay
side connector

Throttle actuator
control motor relay
side connector

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-874

FUEL PUMP CIRCUIT RESISTOR CHECK

M1131055100013

1. Disconnect the fuel pump circuit resistor connector.
2. Measure the resistance between terminals.

Standard value: 0.45 − 0.65 Ω [at 20° C (68° F)]

3. If the resistance is out of specification, replace the fuel pump 

circuit resistor.

INTAKE AIR TEMPERATURE SENSOR CHECK

M1131002801668

Intake air temperature sensor 1

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

No. 4.

Standard value:

13 − 17 kΩ [at -20° C (-4° F)]

5.4 − 6.6 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)]

0.31 − 0.43 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 the resistance does not decrease as heat increases, 

replace the mass airflow sensor.

Intake air temperature sensor 2

1. Disconnect the intake air temperature sensor 2 connector.
2. Measure the resistance between terminal No. 1 and terminal 

No. 2.

Standard value:

13 − 18 kΩ [at -20° C (-4° F)]

5.1 − 6.9 kΩ [at 0° C (32° F)]

2.0 − 3.0 kΩ [at 20° C (68° F)]

0.9 − 1.5 kΩ [at 40° C (104° F)]

0.40 − 0.78 kΩ [at 60° C (140° F)]

0.23 − 0.42 kΩ [at 80° C (176° F)]

1 2

AK202413 AC

Fuel pump circuit
resistor side connector

TEMPERATURE

RESISTANCE (kΩ)

Higher

Smaller

AK704079

3 4

2

1

AB

Mass airflow
sensor connector

AK604487AC

Intake air
temperature
sensor 1

AK704080

2

1

AB

Intake air temperature
sensor 2 connector

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-875

3. If not within specifications, replace the intake air 

temperature sensor 2.

4. Measure resistance while heating the sensor using a hair 

dryer.

Normal condition:

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

replace the intake air temperature sensor 2.

ENGINE COOLANT TEMPERATURE SENSOR 
CHECK

M1131003101673

Required Special Tools:

• MB992042: Engine coolant temperature sensor wrench

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 using the special tool MB992042 
(engine coolant temperature sensor wrench).

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 the resistance deviates from the standard value greatly, 

replace the sensor.

TEMPERATURE

RESISTANCE (kΩ)

Higher

Smaller

AK403661 AE

Intake air temperature
sensor 2

AK503116 AC

MB992042

AK604488AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-876

4. Apply LOCTITE 262, Three bond 1324N or equivalent to 

threaded portion.

5. With the special tool MB992042 (engine coolant 

temperature sensor wrench) tighten the engine coolant 
temperature sensor to the specified torque.

Tightening torque: 30 ± 9 N⋅ m (22 ± 6 ft-lb)

HEATED OXYGEN SENSOR CHECK

M1131005002374

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

• MB991658: Test Harness

.

Heated oxygen sensor (front)

1. Disconnect the heated oxygen sensor connector and 

connect special tool MB991658 to the connector on the 
heated oxygen sensor side.

2. Measure the resistance between terminal No. 1 and terminal 

No. 2 on the heated oxygen sensor connector.

Standard value: 4.5 − 8.0 Ω [at 20 ° C (68° F)]

3. If the resistance deviates from standard value, replace the 

heated oxygen sensor.

4. Warm up the engine until engine coolant is 80° C (176° F) or 

higher.

5. Rev the engine for 5 minutes or more with the engine speed 

of 2,000 r/min.

6. Connect a digital voltage meter between terminal No. 3 and 

terminal No. 4.

AK604489AB

AK604492AB

MB991658

Heated oxygen
sensor component
side connector

AK604493AB

MB991658

Heated oxygen
sensor component
side connector