Mitsubishi 380. Manual — part 490
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-52
STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect left bank heated oxygen sensor (front)
connector B-25.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 3 and terminal No. 4.
Standard value: 9.0
− 11.0 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 9.0 and 11.0 ohms
[at 20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 11.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-53
STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (front) harness side connector B-25.
(1) Disconnect the connector B-25 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
03DB210A
B-25 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-54
STEP 4. Check harness connector B-17X at the MPI relay
for damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MPI relay connector
B-17X (terminal No. 4) and left bank heated oxygen
sensor (front) connector B-25 (terminal No. 3)
because of open circuit or short circuit to ground.
Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-55
STEP 5. Measure the power supply voltage at ENGINE-ECU
connector B-20 by using ENGINE-ECU check harness
special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect
ENGINE-ECU check harness special tool MB992044
between the separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 48 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 8.
NO : Go to Step 6.
STEP 6. Check harness connector B-20 at ENGINE-ECU for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB211A
B-20 HARNESS
CONNECTOR
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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