Mitsubishi Outlander GS45X. Manual — part 943
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-705
.
HEATED OXYGEN SENSOR OFFSET
CIRCUIT LOW VOLTAGE CIRCUIT
Refer to DTC P0131
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 1, sensor 1)
.
Refer to DTC P0137
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 1, sensor 2)
.
Refer to DTC P0151
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 2, sensor 1)
.
Refer to DTC P0157
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 2, sensor 2)
.
.
CIRCUIT OPERATION
Refer to DTC P0131
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 1, sensor 1)
.
Refer to DTC P0137
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 1, sensor 2)
.
Refer to DTC P0151
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 2, sensor 1)
.
Refer to DTC P0157
− Heated Oxygen Sensor Cir-
cuit Low Voltage (bank 2, sensor 2)
.
.
TECHNICAL DESCRIPTION
• The ECM applies an offset voltage of 0.5 volt to
the heated oxygen sensor.
• The ECM checks for heated oxygen sensor offset
voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor offset voltage is under speci-
fied 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
AK700401AB
ECM
B-10 (GR)
Connector: B-10
AK700405AB
Left bank heated
oxygen sensor (rear)
Front
exhaust pipe
B-13 (GR)
Connector: B-13
AK700404
Left bank heated oxygen
sensor (front)
Connector: B-14
AB
B-14 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-706
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
DTC SET CONDITION
Logic Flow Chart
Check Condition
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgement Criterion
• Heated oxygen sensor offset voltage is lower
than 0.4 volt for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnosis Function
− OBD-II Drive Cycle −
Pattern 22
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Right bank heated oxygen sensor (front) failed.
• Right bank heated oxygen sensor (rear) failed.
• Left bank heated oxygen sensor (front) failed.
• Left bank heated oxygen sensor (rear) failed.
• Shorted right bank heated oxygen sensor (front)
circuit or connector damage.
• Shorted right bank heated oxygen sensor (rear)
circuit or connector damage.
• Shorted left bank heated oxygen sensor (front)
circuit or connector damage.
• Shorted left bank heated oxygen sensor (rear)
circuit or connector damage.
• ECM failed.
AK604367
Good
Malfunction
End
No
No
No
2secs have passed?
Heated oxygen
sensor offset voltage
< 0.4V or >0.6V?
Start
Yes
Yes
Yes
Monitoring
conditions
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-707
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991316: Test Harness
• MD998464: Test Harness
STEP 1. Check harness connector B-03 at right bank
heated oxygen sensor (front), harness connector B-02 at
right bank heated oxygen sensor (rear), harness connector
B-14 at left bank heated oxygen sensor (front), harness
connector B-13 at left bank heated oxygen sensor (rear)
and harness connector B-10 at ECM for damage.
Q: Are the harness connectors in good condition?
YES : Go to Step 2.
NO : Repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection
. Then go to
Step 11.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-708
STEP 2. Check the right bank heated oxygen sensor
(front).
(1) Disconnect the 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 sensor (front) side.
(2) Warm up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
(3) Rev the engine for 5 minutes or more with the engine speed
of 2,000 r/min.
(4) Connect a digital voltage meter between terminal No. 2
(black clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the right
bank heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 V
CAUTION
• Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.
• Be careful the heater can be damaged if a voltage
beyond 8 volts is applied to the heated oxygen sensor
heater.
NOTE: If the temperature of sensing area does not reach
the high temperature [of approximately 400
°
C (752
°
F) or
more] even though the heated oxygen sensor is normal, the
output voltage would be possibly low in spite of the rich air/
fuel ratio. Therefore, if the output voltage is low, use a
jumper wire to connect the terminal No. 1 (red clip) and the
terminal No. 3 (blue clip) of the heated oxygen sensor with
the positive terminal and the negative terminal of 8 volts
power supply respectively, then check again.
Q: Is the measured voltage between 0.6 and 1.0 volt?
YES : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (front).
Then go to Step 11.
AK700102
MB991316
White
Black
AB
Heated oxygen
sensor component
side connector
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