Mitsubishi 380. Manual — part 499
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-88
DIAGNOSIS
Required Special Tool:
• : Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using diagnostic tool , check data list item AA:
Mass Airflow Sensor.
CAUTION
To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the data reading mode for item AA,
Mass Airflow Sensor.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C (176°F to 203°F).
• The standard value during idling should be approxi-
mately 4.7 g/sec.
• When the engine is revved, the mass airflow rate should
increase according to the increase in engine speed.
(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 : Go to Step 2.
STEP 2. Check harness connector B-10 at mass airflow
sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 7.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
CONNECTOR: B-10
B-10 (GR)
03DB218A
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-89
STEP 3. Check the continuity at mass airflow sensor
harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness
side.
(2) Check for the continuity between terminal No. 3 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check harness connector B-20 at ENGINE-ECU for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 7.
CONNECTOR: B-10
B-10 (GR)
03DB218A
HARNESS
CONNECTOR:
COMPONENT SIDE
03DB219A
B-10 HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-90
STEP 5. Check for short circuit between mass airflow
sensor connector B-10 (terminal No. 3) and ENGINE-ECU
connector B-20 (terminal No. 26).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 7.
CONNECTOR: B-10
B-10 (GR)
03DB218A
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-91
STEP 6. Using diagnostic tool , check data list item AA:
Mass Airflow Sensor.
CAUTION
To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the data reading mode for item AA,
Mass Airflow Sensor.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C (176°F to 203°F).
• The standard value during idling should be approxi-
mately 4.7 g/sec.
• When the engine is revved, the mass airflow rate should
increase according to the increase in engine speed.
(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 : Replace the Mass Airflow Sensor. Then go to Step 7.
STEP 7. 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 P0103 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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