Mitsubishi 380. Manual - part 644

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-668

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: 18 to 25 N

⋅m

HEATED OXYGEN SENSOR CHECK

M1131005000691

Required Special Tools:

• Diagnostic tool(MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB992044: Test Harness 

.

STEP 1. Using diagnostic tool, check data list.

CAUTION

To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool. 

1. Connect diagnostic tool to the data link connector.

2. Start the engine and run at idle.

3. Set the diagnostic tool to display the Data List for MPI. 

Check the following items in the data list. Refer to Data List 
Reference Table 

P.13A-637

.

(1) Item AC: Right Bank Heated Oxygen Sensor (front).
(2) Item AD: Right Bank Heated Oxygen Sensor (rear).
(3) Item AE: Left Bank Heated Oxygen Sensor (front). 
(4) Item AF: Left Bank Heated Oxygen Sensor (rear).

AKX01623 AB

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-669

4. Using diagnostic tool, observe HO

2

S reading. If values are 

unsatisfactory, check for malfunctioning sensor or damaged 
connector/wiring.

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

°C (176°F) 

or higher.

5. While repeatedly revving the engine, check each heated 

oxygen sensor output voltage.

Standard value:

6. If the output voltage for a sensor is not within the standard 

value:

(1) Turn "OFF" engine.
(2) Disconnect the heated oxygen sensor connector and 

measure the resistance between terminal No. 3 and No. 
4 on heated oxygen sensor side.

(3) Make sure that there is a resisitance of: .

9.0 - 11.0 ohms at 20

°C (68°F)⋅

(4) If the sensor voltage is unsatisfactory or the resistance of 

heater is outside 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.15-14

.

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.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

03DB231A

SENSOR

HARNESS 

CONNECTOR: 

COMPONENT SIDE

1

2

3

4

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-670

INJECTOR CHECK

M1131005200521

.

<Right bank side (number 1, 3, 5 cylinders)>

1. Disconnect the intermediate connector B-32.
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: 10.5 

− 13.5 ohms [at 20°C (68°F)]

3. Connect the injector connector.

INJECTOR NO.

MEASUREMENT 
TERMINAL

RESISTANCE

NO.1

5 

− 9

10.5 

− 13.5 Ω [20°C 

(68

°F)]

NO.3

10 

− 9

NO.5

4 

− 9

1 2 3
6 7 8

4 5
9 10

AK203093

B-32 

INTERMEDIATE

CONNECTOR

AB

AK000126

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-671

THROTTLE ACTUATOR CONTROL MOTOR 
CHECK

M1131051000070

.

<Operation Inspection>

1. Disconnect the air intake hose from the throttle body.

2. Set the ignition switch to the "ON" position.

3. Operate the accelerator pedal and confirm that the throttle 

valve is opening and closing accordingly.

WARNING

If the air intake duct is removed from the throttle body take great care to keep fingers away 
from the throttle plate. The drive motor has very high torque and is capable of random move-
ment at any time. Do not under any circumstances activate the throttle plate by hand.
When removing the throttle body from the intake manifold disconnect the wiring first. During 
replacement connect the wiring last.
Do not activate the throttle body using a DC suppy to test the motor,as permanent damage to 
the throttle body will result.

.

<Checking the Terminal Resistance>

1. Disconnect the throttle position sensor connector.

2. Measure the resistance between terminal No. 1 and No. 4.

Standard value: 1.5

Ω  ± 0.3Ω

3. If resistance is outside the standard value, replace the 

throttle body assembly.

EVAPORATIVE EMISSION PURGE SOLENOID 
CHECK

M1131005600240

Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission System 

− Evaporative Emission Purge Solenoid 

Check 

P.17-83

.

03DB157A

THROTTLE ACTUATOR

CONTROL MOTOR 

CONNECTOR