Mitsubishi 380. Manual — part 578
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-404
STEP 5. Check intermediate connector A-13 and MPI relay
connector B-17X for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 6. Check the harness for open circuit or short circuit
to ground between the MPI relay connector B-17X terminal
1 and the intermediate connector A-13 terminal 5.
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair or replace the harness wire.
10DB083A
A-13 (GR)
CONNECTOR: A-13
1
4
7
8
2 3
5
13 14
17
15
12
16
11
10
9
6
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-405
STEP 7. Measure the ENGINE-ECU to speed sensor, output
voltage at the vehicle speed sensor connector B-121.
(1) Disconnect connector B-121 from the speed sensor and
measure voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and ground.
• The voltage should measure between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check intermediate connector A-13 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the connector and terminals in good condition?
YES : Go to Step 9.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
CONNECTOR: B-121
VEHICLE
SPEED SENSOR
B-121
03DB234A
03DB235A
B-121 HARNESS
CONNECTOR
10DB083A
A-13 (GR)
CONNECTOR: A-13
1
4
7
8
2 3
5
13 14
17
15
12
16
11
10
9
6
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-406
STEP 9. Measure the ENGINE-ECU output voltage to the
speed sensor at the ENGINE-ECU connector B-21 by using
check harness special tool MB992044.
(1) Disconnect all the connectors from the ENGINE-ECU.
(2) Connect special tool MB992044 (check harness) between
the ENGINE-ECU and the control-side harness connectors.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between connector B-21 (terminal 85)
and ground.
• The voltage should measure between 4.5 and 4.9 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 10.
NO : Go to Step 12.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB236A
MB992044 CHECK HARNESS
CONNECTOR: B-21
MULTIPORT FUEL INJECTION (MPI) DIAG
MULTIPORT FUEL INJECTION (MPI)
13A-407
STEP 10. Check ENGINE-ECU connector B-21 and vehicle
speed sensor connector B-121 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are the connectors in good condition?
YES : Go to Step 11.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
CONNECTOR: B-121
VEHICLE
SPEED SENSOR
B-121
03DB234A
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