Mitsubishi Montero Sport (2004+). Manual — part 213
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-265
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 1) to the right bank heated oxygen sensor
(rear) heater.
• The PCM (terminal No. 27) controls continuity to
the right bank heated oxygen sensor (rear)
heater by turning the power transistor in the PCM
"ON" and "OFF".
.
BACKGROUND
• The PCM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor heater (rear) 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
.
AK200018 AC
CONNECTOR: E-45
E-45(B)
AK201000
MFI RELAY
CONNECTOR: C-59
AB
C-59
AK103738AD
CONNECTOR: C-89
PCM
C-89(GR)
AK200491
E-47(GR)
AB
CONNECTOR: E-47
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-266
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 right bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgment Criteria
• Right bank heater current of the right bank
heated oxygen sensor (rear) heater has contin-
ued to be lower than 0.16 ampere or higher than
5.0 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 right bank heated oxygen sen-
sor (rear) heater circuit, or harness damage.
• Open circuit in right bank heated oxygen sensor
(rear) heater, or harness damage.
• Right bank heated oxygen sensor (rear) failed.
• Connector damage.
• PCM failed.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 5.0A
AK301443
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-267
DIAGNOSIS
Required Special Tool:
• MB991316: Test Harness
STEP 1. Check connector E-47 at the right bank heated
oxygen sensor (rear) for damage.
Q: Is the 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.
AK200492
1
2
3
4
E-47(GR)
AB
CONNECTOR: E-47
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-268
STEP 2. Check the right bank heated oxygen sensor (rear).
(1) Disconnect right bank heated oxygen sensor (rear)
connector E-47 and connect test harness special tool,
MB991316, to the connector on the right bank heated
oxygen (rear) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 11
− 18 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 11 and 18 ohms [at
20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (rear).
Then go to Step 12.
AK200492
1
2
3
4
E-47(GR)
AB
CONNECTOR: E-47
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
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