Mitsubishi Montero (2004+). Manual — part 181
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-211
DTC P0135: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 1)
TO PCM
TO PCM
WHITE-
BL
ACK
WHITE-
BL
ACK
AK201132
RED
BL
UE-RED
RIGHT BANK HEATED
OXYGEN SENSOR (FRONT)
4
1 2
3
B-22X
3
2
4
1
BATTERY
1
3
2
4
25
MFI
RELAY
3
1 2
4
B-07
MU802605
POWERTRAIN
CONTROL
MODULE (PCM)
Right Bank Heated Oxygen Sensor (front) Heater Circuit
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-212
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 1) to the right bank heated oxygen sensor
(front) heater.
• The PCM (terminal No. 25
) controls continuity to the right bank heated oxy-
gen 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
Right 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
.
AK201273
CONNECTOR: B-07
B-07(B)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-213
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 (front)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgment Criteria
• The right bank heated oxygen sensor (front)
heater current has continued to be lower than
0.16 ampere or higher than 7.5 ampere for 4 sec-
onds.
.
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: )
• Right bank heated oxygen sensor (front) heater
deteriorated.
• Open or shorted right bank heated oxygen sen-
sor (front) heater circuit or harness damage.
• 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 > 7.5A
AK302934
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-214
DIAGNOSIS
Required Special Tool:
• MD998464: Test Harness
STEP 1. Check harness connector B-07 at the right 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.
AK201274
1
2
3
4
CONNECTOR: B-07
B-07(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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