Mitsubishi Outlander GS45X. Manual — part 601
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-227
STEP 5. Test the OBD-II drive cycle.
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) Turn the ignition switch to the "ON" position and delete the
DTC.
(3) Carry out the test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 22
(4) Check the diagnostic trouble code (DTC).
Q: Is DTC P0131 set?
YES : Then go to Step 6.
NO : 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
.
STEP 6. Replace the linear air-fuel ratio sensor.
(1) Replace the linear air-fuel ratio sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 22
(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0131 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Code Registration Judgment Table <Vehicles
with KOS>
P.42B-15
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
P.42C-10
. Then go to Step 7.
NO : The inspection is complete.
STEP 7. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 22
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0131 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-228
13A
DTC P0132: Linear Air-Fuel Ratio Sensor Circuit High Voltage
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
P
3
2
1
6
5
4
AKA00449
1
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
LINEAR AIR-FUEL RATIO SENSOR CIRCUIT
LINEAR
AIR-FUEL
RATIO
SENSOR
FROM
MFI RELAY
WHITE
BLA
CK
RED
WHITE
BLA
CK
RED
C-142
ENGINE
CONTROL
MODULE
38
39
56
4
5
1
14
20
21
2
6
3
B-10
A-12
AC
TO ECM TO ECM
AKA00842 AB
Connector: A-12
A-12
AK704090AB
Connector: B-10
B-10 (GR)
AK704089AD
Linear air-fuel
ratio sensor
SRS-ECU
Connector: C-142
C-142 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-229
.
CIRCUIT OPERATION
The linear air-fuel ratio sensor and the ECM are con-
nected by the following three lines to detect the
air-fuel ratio.
• The line between the linear air-fuel ratio sensor
(terminal No. 1) and the ECM (terminal No. 56)
detects the air-fuel ratio.
• The auxiliary line between the linear air-fuel ratio
sensor (terminal No. 4) and the ECM (terminal
No. 38) detects the air-fuel ratio.
• The line between the linear air-fuel ratio sensor
(terminal No. 5) and the ECM (terminal No. 39) is
connected to ground.
.
TECHNICAL DESCRIPTION
• The ECM effects air/fuel ratio feedback control in
accordance with the signals from the linear
air-fuel ratio sensor.
• If the linear air-fuel ratio sensor has deteriorated,
corrections will be made by the heated oxygen
sensor (rear).
.
DESCRIPTIONS OF MONITOR METHODS
• If one of the three line voltages is excessively
high or if all the three line voltages are exces-
sively high, the DTC is stored as a malfunction.
.
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)
• Linear air-fuel ratio sensor heater monitor
• Misfire monitor
• Fuel system monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
• Accelerator pedal position sensor
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-230
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Battery positive voltage is between 10 and 16.5
volts.
• More than 40 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• The pumping circuit voltage is higher than the
battery positive voltage from which you subtract
1.2 volt for 2 seconds.
or
• The reference circuit voltage is higher than bat-
tery positive voltage from which you subtract 1.2
volt for 2 seconds.
or
• The negative circuit voltage is be higher than 6.2
volts for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnosis Function
− OBD-II Drive Cycle −
Pattern 22
.
End
Malfunction
No
No
No
2secs have passed?
Pumping circuit voltage > Battery voltage -1.2 V
or
Reference circuit voltage > Battery voltage -1.2 V
or
Negative circuit voltage > 6.2 V
Good
AK900358
Start
Yes
Yes
Yes
Monitoring
conditions
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