Mitsubishi Outlander GS45X. Manual — part 800
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-133
.
CIRCUIT OPERATION
• The mass airflow sensor power is supplied from
the MFI relay (terminal No. 2), and the ground is
provided on the ECM (terminal No. 88).
• A voltage that is according to the mass airflow
rate is sent to the ECM (terminal No. 87) from the
mass airflow sensor output terminal (terminal No.
3).
.
TECHNICAL DESCRIPTION
• While the engine is running, the mass airflow
sensor outputs voltage which corresponds to the
mass airflow rate.
• The ECM checks whether the voltage output by
the mass airflow sensor while the engine is run-
ning is within a specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Compare load value with mass airflow sensor output
voltage.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Throttle position sensor
.
AK700406
AB
Mass airflow
sensor
A-07 (GR)
Connector: A-07
AK700402AB
ECM
B-11 (GR)
Connector: B-11
AK700399AB
MFI relay
A-33X
Connector: A-33X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-134
DTC SET CONDITIONS <Range/Performance problem - low input>
Logic Flow Chart
.
Check Conditions
• Engine speed is 1,500 r/min or higher.
• Throttle position sensor output voltage is 1.5 volts
or higher.
• Mass airflow sensor output voltage is 0.2 volt or
higher.
Judgement Criterion
• Mass airflow sensor output voltage has continued
to be 1.8 volts or lower for 2 seconds.
.
Start
End
No
Yes
Yes
Yes
No
No
Malfunction
Good
Continuous
failure for 2secs
Output voltage
< = 1.8V
Monitoring
conditions
AK700457
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-135
DTC SET CONDITIONS <Range/Performance problem - high input>
Logic Flow Chart
.
Check Conditions
• Throttle position sensor output voltage is 0.8 volt
or lower.
• Mass airflow sensor output voltage is 4.9 volts or
lower.
Judgement Criterion
• Mass airflow sensor output voltage has continued
to be 2.5 volts or higher for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 7
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Mass airflow sensor failed.
• Connector damage
• Harness damage
• ECM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
End
No
No
No
Malfunction
Good
Output voltage
>= 2.5 V
AK900353
Start
Yes
Yes
Yes
Continuous
failure for 2secs
Monitoring
conditions
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-136
STEP 1. Using scan tool MB991958, check data list item 10:
Mass Airflow Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
10, 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 between
1,350 and 1,670 millivolts.
• 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
P.00-15
.
NO : Go to Step 2.
STEP 2. Check harness connector A-07 at the mass airflow
sensor and harness connector B-11 at the ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair it. Refer to GROUP 00E, Harness Connector
Inspection
P.00E-2
. Then go to Step 6.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
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