Mitsubishi Montero Sport (2004+). Manual — part 232
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-341
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 73) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(rear).
• Terminal No. 2 of the left bank heated oxygen
sensor (rear) is grounded with PCM (terminal No.
57).
.
TECHNICAL DESCRIPTION
• The output signal of the left bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the left bank heated oxygen sensor (rear).
• The PCM checks for an open circuit in the left
bank heated oxygen sensor (rear) output line.
.
AK200497
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
E-48(B)
AB
CONNECTOR: E-48
AK103738AE
CONNECTORS: C-90, C-91
PCM
C-91(GR)
C-90(GR)
AK200018 AB
CONNECTOR: E-44
E-44
AK103912AB
CONNECTOR: C-71
C-71
AK103911AC
CONNECTOR: C-79
C-79
AK200018 AC
CONNECTOR: E-45
E-45(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-342
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (rear) output voltage
stays low when air/fuel ratio is forced to be rich.
The above procedure is repeated when oxygen
sensor is inactive.
.
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)
• Heated oxygen sensor heater (front) monitor
• Heated oxygen sensor heater (rear) monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-343
DTC SET CONDITIONS
Logic Flow Chart
.
START
V
F
> =4.5V
2secs HAS PASSED
YES
YES
YES
NO
NO
NO
MALFUNCTION
MONITORING
CONDITIONS
YES
NO
MONITORING
CONDITIONS
+5V ON
AK301440
V
F
< 0.15V
10secs HAS PASSED
YES
YES
NO
NO
END
MALFUNCTION
GOOD
MODULATE A/F CONDITION TO RICH
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-344
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Left bank heated oxygen sensor (rear) signal volt-
age has continued to be 0.15 volt or lower.
• Engine coolant temperature is higher than 76°C
(169
°F).
• Engine speed is higher than 1,200 r/min.
• Volumetric efficiency is higher than 25 percent.
• Volume airflow sensor output frequency is 100 Hz
or more.
• At least 20 seconds have passed since fuel shut
off control was canceled.
• Monitoring time: 10 seconds.
Judgement Criteria
• Making the air/fuel ratio 15 percent for 10 sec-
onds richer does not result in raising the left bank
heated oxygen sensor (rear) output voltage
beyond 0.15 volt.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Left bank heated oxygen sensor (rear) failed.
• Short circuit in left bank heated oxygen sensor
(rear) output line.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
• MB998464: Test Harness Set
STEP 1. Using scan tool MB991958, check data list item 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left bank).
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
59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
• Warm up the engine. When the engine is revved, the
output voltage should repeat 0 volt and 0.6 to 1.0 volt
alternately.
(4) 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
NO : Go to Step 2.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
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