Mitsubishi Montero Sport (2004+). Manual — part 226
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-317
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 1) to the left bank heated oxygen sensor
(front) heater.
• The PCM (terminal No. 3) controls continuity to
the left bank heated oxygen sensor (front) heater
by turning the power transistor in the PCM "ON"
and "OFF".
.
TECHNICAL DESCRIPTION
• The PCM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor heater (front) cur-
rent is out of specified range when engine coolant
temperature is over 20
°C (68°F).
.
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)
• Engine coolant temperature sensor
.
AK200495
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
A-09(GR)
AB
CONNECTOR: A-09
AK201000
MFI RELAY
CONNECTOR: C-59
AB
C-59
AK103911AB
CONNECTOR: C-14
C-14
AK103738AD
CONNECTOR: C-89
PCM
C-89(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-318
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the left bank heated oxygen sensor (front)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgment Criteria
• Heater current of the left bank heated oxygen
sensor (front) heater has continued to be lower
than 0.16 ampere or higher than 7.5 ampere for 4
seconds.
.
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:)
• Open or shorted left bank heated oxygen sensor
(front) heater circuit, harness damage or connec-
tor damage.
• Open circuit in left bank heated oxygen sensor
(front) heater.
• Left bank heated oxygen sensor (front) deterio-
rated.
• PCM failed.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 7.5A
AK301439
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-319
DIAGNOSIS
Required Special Tool:
• MB991316: Test Harness
STEP 1. Check connector A-09 at the left bank heated
oxygen sensor (front) 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 12.
AK200496
1
2
3
4
A-09(GR)
AB
CONNECTOR: A-09
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-320
STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect left bank heated oxygen sensor (front)
connector A-09 and connect test harness special tool,
MB991316, to the connector on the left bank heated oxygen
(front) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 4.5
− 8.0 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 4.5 and 8.0 ohms?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 12.
AK200496
1
2
3
4
A-09(GR)
AB
CONNECTOR: A-09
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
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