Mitsubishi Outlander GS45X. Manual — part 785
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-73
DIAGNOSIS
Required Special Tool:
• MB991316: Test Harness
STEP 1. Check the right bank heated oxygen sensor
(front).
(1) Disconnect right bank heated oxygen sensor (front)
connector B-03 and connect test harness special tool,
MB991316, to the connector on the right 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 Ω [at 20°C (68°F)]
Q: Is the measured resistance between 4.5 and 8.0 ohms
[at 20
°C (68°F)]?
YES : Go to Step 2.
NO : Replace the right bank heated oxygen sensor (front).
Then go to Step 3.
STEP 2. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 2
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0032 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles
with KOS>
P.42B-15
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
P.42C-10
. 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
P.00-15
.
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 2
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0032 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK700175
Heated
oxygent
sensor
component
side
connector
MB991316
Red
Blue
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-74
DTC P0037: Heated Oxygen Sensor Heater Circuit Low (bank 1, sensor 2)
AK700129
1
3
2
4
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
1
10 111213 14 1516 17 1819 20
2 3 4
5 6 7 8 9
2
1
4
3
AB
20A
WHITE
BLUE-WHITE
WHITE
WHITE
WHITE
A-33X
4
3
1
2
22
1
2
3
4
49
4
B-02
MU802605
B-10
A-13
OFF
ON
36
FUSIBLE LINK
RELAY BOX
(ENGINE COMPARTMENT)
TO ECM
TO ECM
TO ECM
4
ENGINE
CONTROL
MODULE
RIGHT BANK HEATED OXYGEN SENSOR (REAR) HEATER CIRCUIT
RIGHT BANK HEATED
OXYGEN SENSOR (REAR)
MFI
RELAY
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-75
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 2) to the right bank heated oxygen sensor
(rear) heater.
• The ECM (terminal No. 49) controls continuity to
the right bank heated oxygen sensor (rear)
heater by turning the power transistor in the ECM
"ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The ECM checks whether the heater current is
within a specified range when the heater is ener-
gized.
• The ECM checks whether the heater voltage is
within a specified range when the heater is not
energized.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor heater (rear) cur-
rent or voltage is out of specified range.
.
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)
• Not applicable
.
AK700399AB
MFI relay
A-33X
Connector: A-33X
AK900130AD
Right bank heated
oxygen sensor (rear)
Front exhaust
pipe RH
B-02 (B)
Connector: B-02
AK700401AB
ECM
B-10 (GR)
Connector: B-10
AK900602
Connector: A-13
A-13
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-76
DTC SET CONDITION
Logic Flow Chart
.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the right bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgement Criterion
• The right bank heated oxygen sensor (rear)
heater current has continued to be lower than
0.17 ampere for 2 seconds.
.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the right bank heated oxygen sensor (rear)
heater is off.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgement Criterion
• The right bank heated oxygen sensor (rear)
heater voltage has continued to be lower than 2.0
volts for 2 seconds.
.
End
No
No
Malfunction
Good
Current < 0.17A
or
Current > 10.5A
Voltage < 2.0V
AK900352
Heater activation
command ON
No
No
Start
Yes
Yes
Yes
Yes
Yes
No
Continuous
failure for 2secs
Monitoring
conditions
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