Mitsubishi Outlander GS45X. Manual — part 603
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-235
Judgement Criteria
• The average frequency is less than 8 times.
• The frequency is less than 13 times.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnosis Function
− OBD-II Drive Cycle −
Pattern 1
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Linear air-fuel ratio sensor failed.
• Connector damage.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Check harness connector C-142 at linear air-fuel
ratio sensor and harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 3.
STEP 2. 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 1
(4) Check the diagnostic trouble code (DTC).
Q: Is DTC P0133 set?
YES : Replace the linear air-fuel ratio sensor. Then go to
Step 3.
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
.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-236
STEP 3. 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 1
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0133 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0134: Linear Air-Fuel Ratio Sensor Circuit No Activity Detected
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-237
.
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
• The linear air-fuel ratio sensor is heated by the
linear air-fuel ratio sensor heater or the exhaust
gas. If the linear air-fuel ratio sensor remains not
activated although being under the conditions
where it can sufficiently be activated, 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
.
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-238
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Battery positive voltage is between 10 and 16.5
volts.
• More than 220 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• The sensor impedance is be higher than 100
ohms for 10 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnosis Function
− OBD-II Drive Cycle −
Pattern 22
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Linear air-fuel ratio sensor failed.
• Open linear air-fuel ratio sensor circuit, harness
damage or connector damage.
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
Malfunction
Good
10secs have passed?
AK900361
Start
Yes
No
Yes
Yes
Monitoring
conditions
Sensor impedance
> 100 ohm
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