Mitsubishi 380. Manual — part 535
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-232
STEP 1. Using diagnostic tool, check data list item AE:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
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) Ensure engine is at running temperature (80
° C or higher).
(4) Set diagnostic tool to the data reading mode for item AE,
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
• Warming up the engine. When the engine is revved, the
output voltage should alternate between 0 and 0.6 to 1.0
volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
NO : Then go to Step 2.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-233
STEP 2. Measure the sensor output 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) Start the engine and run at idle.
(3) Ensure engine is at running temperature (80
° C or higher).
(4) Measure the voltage between terminal No. 15 and ground.
• Warm engine. When the engine is revved, the output
voltage should alternate between 0 and 0.6-1.0 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage cycling within the specified
range?
YES : Go to Step 6.
NO : Then go to Step 3.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB208A
B-20 HARNESS
CONNECTOR
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-234
STEP 3. Check harness connector B-25 at left bank heated
oxygen sensor (front) and connector B-20 at ENGINE-ECU
for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 7.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-235
STEP 4. Check for open circuit between left bank heated
oxygen sensor (front) connector B-25 (terminal No. 1) and
ENGINE-ECU connector B-20 (terminal No. 15).
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Then go to Step 7.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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