Mitsubishi 380. Manual — part 491
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-56
STEP 7. Check for open circuit or short circuit to ground
between left bank heated oxygen sensor (front) connector
B-25 (terminal No. 4) and ENGINE-ECU connector B-20
(terminal No. 48).
Q: Is the harness wire in good condition?
YES : Then go to Step 8.
NO : Repair it. Then go to Step 11.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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-57
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
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-58
STEP 9. Check for harness damage between MPI relay
connector B-17X (terminal No. 4) and left bank heated
oxygen sensor (front) connector B-25 (terminal No. 3).
Q: Is the harness wire in good condition?
YES : Go to Step 10.
NO : Repair it. 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
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-59
STEP 10. Check for harness damage between left bank
heated oxygen sensor (front) connector B-25 (terminal No.
4) and ENGINE-ECU connector B-20 (terminal No. 48).
Q: Is the harness wire in good condition?
YES : Go to Step 11.
NO : Repair it. Then go to Step 11.
STEP 11. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− EOBD Drive Cycle −
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0051 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
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