Mitsubishi 380. Manual — part 497
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-80
STEP 2. 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 P0101 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-81
DTC P0102: Mass Airflow Circuit Low Input.
CAUTION
If DTC P0102 has been set, TCL related DTC
U1120 is also set. After P0102 has been diag-
nosed, don't forget to erase DTC U1120.
.
CIRCUIT OPERATION
• The mass airflow sensor power is supplied from
the MPI relay (terminal No. 4), and the ground is
provided on the ENGINE-ECU (terminal No. 11).
• 5-volt power is applied to the mass airflow sensor
output terminal (terminal No. 4) from the
ENGINE-ECU (terminal No. 11).
.
TECHNICAL DESCRIPTION
• While the engine is running, the mass airflow
sensor outputs voltage which corresponds to the
mass airflow rate.
• The ENGINE-ECU checks whether the voltage
output by the mass airflow sensor while the
engine is running is within a specified speed and
load range.
.
DTC SET CONDITIONS
Check Conditions
• Battery voltage is above 8.01 volts.
• Crankshaft revolution is above 150 r/min.
Judgement Criteria
• Air flow sensor output is below lower threshold
(0-283.0 kg/h) for 4 seconds.
• MIL is activated immediately.
• No limp home mode.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Mass airflow sensor failed.
• Open or shorted mass airflow sensor circuit, or
connector damage.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
CONNECTOR: B-10
B-10 (GR)
MASS
AIRFLOW
SENSOR
03DB217A
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-82
DIAGNOSIS
Required Special Tools:
• : Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB992044: ECU Check Harness
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 11.
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-83
STEP 3. Measure the power supply voltage at mass airflow
sensor harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2 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 5.
NO : Go to Step 4.
STEP 4. Check harness connector B-17X at 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 mass airflow sensor
connector B-10 (terminal No. 2) 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.
CONNECTOR: B-10
B-10 (GR)
03DB218A
HARNESS
CONNECTOR:
COMPONENT SIDE
03DB220A
B-10 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
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