Mitsubishi 380. Manual — part 484
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-28
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 right bank heated oxygen
sensor (front) connector B-09 (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-29
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. 47 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
03DB201A
B-20 HARNESS
CONNECTOR
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-30
STEP 7. Check for open circuit or short circuit to ground
between right bank heated oxygen sensor (front)
connector B-09 (terminal No. 4) and ENGINE-ECU
connector B-20 (terminal No. 47).
Q: Is the harness wire in good condition?
YES : Then go to Step 8.
NO : Repair it. Then go to Step 11.
1
2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-31
STEP 8. Check harness connector B-20 at ENGINE-ECU for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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