Mitsubishi Outlander GS45X. Manual — part 607
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-251
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Heated oxygen sensor offset voltage is between
0.4 and 0.6 volt.
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgement Criterion
• Heated oxygen sensor (rear) output voltage has
continued to be 1.8 volts or higher for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 23
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Shorted heated oxygen sensor (rear) circuit, or
connector damage.
• ECM failed.
End
Malfunction
No
No
No
2secs have passed?
Output voltage
> 1.8V
Good
AK604322
Start
Yes
Yes
Yes
Monitoring
conditions
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-252
DIAGNOSIS
STEP 1. Check harness connector D-37 at heated oxygen
sensor (rear) and harness connector B-10 at 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
. Then go to Step 3.
STEP 2. Check for short circuit to power supply between
heated oxygen sensor (rear) connector D-37 (terminal No.
3) and ECM connector B-10 (terminal No. 40).
NOTE: Check harness after checking intermediate connector
A-13 and C-129. If intermediate connector is damaged, repair
or replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion
. Then go to Step 3.
Q: Is the harness wire in good condition?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Code Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
NO : Repair it. Then go to Step 3.
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 23
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0138 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-253
DTC P0139: Heated Oxygen Sensor (rear) Circuit Slow Responce
AK900383
1 2
3 4
1
10 111213 14 1516 17 1819 20
2 3 4
5 6 7 8 9
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
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
AD
D-37
FROM MFI RELAY
TO ECM
1
4
2
3
HEATED OXYGEN SENSOR (REAR) CIRCUIT
HEATED OXYGEN
SENSOR (REAR)
B-10
YELLO
W
ORANGE
ORANGE
YELLO
W
ENGINE
CONTROL
MODULE
0.5 V
C-129
18
41
40
17
17
ORANGE
YELLO
W
15
A-13
AK704087AB
Connector: A-13
A-13
AK704090AB
Connector: B-10
B-10 (GR)
AK900595
Connector: C-129
C-129
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-254
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 40) from the output terminal (terminal
No. 3) of the heated oxygen sensor (rear).
• Terminal No. 4 of the heated oxygen sensor
(rear) is grounded with ECM (terminal No. 41).
• The ECM applies an offset voltage of 0.5 volt to
terminal No. 4 of the heated oxygen sensor (rear)
.
TECHNICAL DESCRIPTION
• The output signal of the linear air-fuel ratio sensor
is compensated by the output signal of the
heated oxygen sensor (rear).
• The ECM checks for the heated oxygen sensor
(rear) output voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (rear) output voltage does not
reach 0.2 volt after fuel cut operation.
.
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)
• Linear air-fuel ratio sensor monitor
• Linear air-fuel ratio sensor heater monitor
• Heated oxygen sensor (rear) heater monitor
• Heated oxygen sensor offset voltage monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK900665
D-37 (B)
Rear heater duct (RH)
Heated oxygen
sensor (rear)
AB
Connector: D-37
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