Mitsubishi Outlander GS45X. Manual — part 794
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-109
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 2) to the left bank heated oxygen sensor
(rear) heater.
• The ECM (terminal No. 35) controls continuity to
the left 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
Left bank heated oxygen sensor heater (rear) current
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
AK700405AB
Left bank heated
oxygen sensor (rear)
Front
exhaust pipe
B-13 (GR)
Connector: B-13
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-110
DTC SET CONDITION
Logic Flow Chart
.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the left bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The left 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 left bank heated oxygen sensor (rear)
heater is off.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The left 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-111
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 2
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Left bank heated oxygen sensor (rear) heater
failed.
• Connector damage.
• Harness damage
• Left bank heated oxygen sensor (rear) failed.
• ECM failed.
DIAGNOSIS
Required Special Tools:
• MB991316: Test Harness
STEP 1. Check harness connector B-13 at the left bank
heated oxygen sensor (rear) and harness connector B-10
at the ECM 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
P.00E-2
. Then go to Step 6.
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect left bank heated oxygen sensor (rear) connector
B-13 and connect test harness special tool, MB991316, to
the connector on the left 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 Ω [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 left bank heated oxygen sensor (rear).
Then go to Step 6.
STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (rear) harness side connector B-13.
(1) Disconnect the connector B-13 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Repair harness wire between the MFI relay connector
A-33X (terminal No. 2) and the left bank heated
oxygen sensor (rear) connector B-13 (terminal No. 1)
because of open circuit or harness damage. Then go
to step 6.
AK700175
Heated
oxygent
sensor
component
side
connector
MB991316
Red
Blue
AB
AK700189
1
2
3
4
AB
B-13 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-112
STEP 4.Check for open circuit to ground or harness
damage between left bank heated oxygen sensor (rear)
connector B-13 and ECM connector B-10.
(1) Disconnect the left bank heated oxygen sensor (rear)
connector B-13 and the ECM connector B-10.
(2) Measure the resistance between the heated oxygen sensor
connector B-13 (terminal No. 3) and the ECM connector
B-10 (terminal No. 35).
• Should be less than 2 ohms.
(3) Check for the continuity between the oxygen sensor
connector B-13 (terminal No. 3) and ground.
• Not continuity.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair it. Then go to Step 6.
STEP 5. 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 P0057 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 6.
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
.
AK700190
1
2
3
4
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
B-13 harness connector:
component side
B-10 harness connector:
component side
AB
AK703868
1
2
3
4
AB
B-13 harness
connector:
component side
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