Mitsubishi Outlander GS45X. Manual — part 608

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-255

DTC SET CONDITIONS
Logic Flow Chart

.

No

No

No

No

No

No

Good

Malfunction

N = 0

N = N + 1

End

Fuel cut starts?

Fuel cut continues?

Output voltage >= 0.5V

at fuel cut start?

Output voltage
reaches 0.2V?

No

Start

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Monitoring conditions

Trl >= T0

Tslope > T1

N = 3

Trl : Time from fuel cut start
Tslope: Time from 0.4 V to 0.2 V
T0, T1: Threshold value

AK900362

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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Check Conditions

• Engine coolant temperature is higher than 76°C

(169

°F).

• The linear air-fuel ratio sensor is active.

• The cumulative mass airflow sensor output is

higher than 1,741 g.

• Fuel is being shut off.

• Heated oxygen sensor (rear) output voltage is

higher than 0.5 volt when fuel cut is started.

• It has been taking more than 180 seconds since

the drive signal of the heated oxygen sensor
(rear) heater was turned on.

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

Judgement Criterion

• Heated oxygen sensor (rear) output voltage does

not reach 0.2 volt for 6 seconds from fuel cut
start.

Check Conditions

• Engine coolant temperature is higher than 76°C

(169

°F).

• The linear air-fuel ratio sensor is active.

• The cumulative mass airflow sensor output is

higher than 1,741 g.

• Fuel is being shut off.

• The heated oxygen sensor (rear) output voltage

is higher than 0.5 volt when fuel cut is started.

• It has been taking more than 180 seconds since

the drive signal of the heated oxygen sensor
(rear) heater was turned on.

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

• The ECM monitors for this condition for 3 cycles

of 0.5 second each during drive cycles.

Judgement Criteria

• The heated oxygen sensor (rear) output voltage

does not reach 0.2 volt for 0.5 second from 0.4
volt while fuel is being shut off.

• The ECM monitors for this condition once during

the drive cycle.

NOTE: Monitoring stops after fuel has been shut off
for more than 64 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 11

P.13A-11

.

.

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)

• Heated oxygen sensor (rear) deteriorated.

• Connector damage.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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STEP 1. Using scan tool MB991958, check data list item
AD: Heated Oxygen Sensor (rear).

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

AD, Heated Oxygen Sensor (rear).

(4) Warm up the engine.

• After increasing the output voltage 0.5 volt or more by

the engine revving, finish it. Then confirm that the output
voltage reduces to 0.2 volt or less within 6 seconds.

(5) 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 heated oxygen sensor (rear). Then go to

Step 2.

STEP 2. 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 11

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?

YES : Refer to DTC P0137

− Heated Oxygen Sensor (rear)

Circuit Low Voltage

P.13A-241

, DTC P0138

− Heated

Oxygen Sensor (rear) Circuit High Voltage

P.13A-249

.

NO : The inspection is complete.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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DTC P0140: Heated Oxygen Sensor (rear) Circuit No Activity Detected

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