Mitsubishi Outlander GS45X. Manual — part 833
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-265
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Heated oxygen sensor offset voltage is between
0.4 and 0.6 volt.
• Battery positive voltage is between 11 and 16.5
volts.
• More than 180 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Left bank heated oxygen sensor (front) output
voltage is lower than 0.2 volt for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 21
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Left bank heated oxygen sensor (front) failed.
• Connector damage.
• Harness damage.
• ECM failed.
End
Malfunction
Yes
Yes
Yes
No
No
No
2secs have passed?
Output voltage
< 0.2V
Monitoring
conditions
Good
Start
AK700471
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-266
DIAGNOSIS
STEP 1. Check harness connector B-14 at the left bank
heated oxygen sensor (front) 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 5.
STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect the left bank heated oxygen sensor (front)
connector B-14 and connect test harness special tool,
MB998464, to the connector on the left 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 2,500 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 left bank
heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volts
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 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 posi-
tive terminal and the negative terminal of 8 volts power sup-
ply respectively, then check again.
Q: Is the voltage between 0.6 and 1.0 volts?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 5.
AK700554AB
Heated
oxygen
sensor
component
side
connector
MD998464
Black
White
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-267
STEP 3. Check for harness between the left heated oxygen
sensor (front) connector B-14 and the ECM connector
B-10.
(1) Disconnect the left bank heated oxygen sensor (front)
connector B-14 and the ECM connector B-10.
(2) Measure the resistance between the heated oxygen sensor
connector B-14 and the ECM connector B-10.
a. Connector B-14 (terminal No. 2) and connector B-10
(terminal No. 39).
b. Connector B-14 (terminal No. 4) and connector B-10
(terminal No. 38).
• Should be less than 2 ohms.
(3) Check for the continuity between the oxygen sensor
connector B-14 and ground.
a. Connector B-14 (terminal No. 2) and ground
b. Connector B-14 (terminal No. 4) and ground
• Not continuity.
Q: Is the harness wire in good condition?
YES : Go to Step 4.
NO : Repair it. Refer to GROUP 00E, Harness Connector
Inspection
P.00E-2
. Then go to Step 5.
AK700287
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
AB
B-14 harness
connector:
component side
B-10 harness
connector:
component side
1
2
3
4
AK700288 AB
B-14 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-268
STEP 4. Using scan tool MB991958, check data list item
AE: Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
AE, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
• Warm up the engine. When the engine is revved, the
output voltage should battery positive voltage.
• Warm up the engine. When the engine is idling, the out-
put voltage should repeat 0.4 volt or less and 0.6 to 1.0
volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : 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
.
NO : Replace the ECM. Then go to Step 5.
STEP 5. 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 21
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0151 set?
YES : Retry the troubleshooting.
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
.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
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