Mitsubishi Evolution X. Manual — part 284
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-113
DTC P0102: Mass Airflow Circuit Low Input
AK704233
71 72 73 74 75 76 77 78 79 80 81 82
83 84 85 86 87 88 89 90 91 92 93 94
95 96 97 98 99
100 101 102 103 104
112 113 114
109
108
107
110 111
115 116
106
105
118
117
1
3
2
4
3 4
2
1
AB
MASS AIRFLOW SENSOR CIRCUIT
MASS AIRFLOW SENSOR
87
88
3
2
HEAT
SENSITIZING
RESISTANCE
BLUE
A-07
(MU805110)
4
20A
WHITE
WHITE
WHITE
A-34X
4
3
1
2
22
B-10
36
FUSIBLE LINK
OFF
ON
RELAY BOX
(ENGINE COMPARTMENT)
ENGINE
CONTROL
MODULE
TO ECM
MFI
RELAY
BLA
CK-BLUE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-114
.
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
Mass airflow sensor output voltage is out of specified
range.
.
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)
• Not applicable
.
AK704234
Connector: A-07
Mass airflow sensor
A-07 (GR)
AB
AK704226
Connector: A-34X
MFI relay
A-34X
AB
AK704235 AB
Connector: B-10
ECM
B-10 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-115
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
• 3 seconds or more have passed since the ignition
switch was turned to "ON" position.
Judgement Criterion
• Mass airflow sensor output voltage has continued
to be lower than 0.2 volt (corresponding to an air
flow rate of 0 g/sec) for 2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 23
.
.
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.
• ECM failed.
End
Malfunction
No
No
No
Output voltage
< 0.2V
Output voltage
> 4.9V
Good
AK604310
No
Start
Yes
Yes
Yes
Yes
Continuous
failure for 2secs
Monitoring
conditions
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-116
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB992110: Power Plant ECU Check Harness
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
1,300 and 1,650 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
.
NO : Go to Step 2.
STEP 2. Check harness connector A-07 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 10.
STEP 3. Measure the power supply voltage at mass airflow
sensor harness side connector A-07.
(1) Disconnect the connector A-07 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.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AK704237
2 1
3
4
A-07 harness
connector:
component side
AB
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