Mitsubishi Outlander GS45X. Manual - part 605

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-243

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.

• 3 minutes or more have passed since the engine 

starting sequence was completed.

Judgement Criterion

• Heated oxygen sensor (rear) 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 22 

P.13A-11

.

.

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

• Heated oxygen sensor (rear) failed.

• Open or shorted heated oxygen sensor (rear) cir-

cuit, harness damage or 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

• MB991658: Test Harness

• MB992110: Power Plant ECU Check Harness

End

Malfunction

No

No

No

2secs have passed?

Output voltage

< 0.2V

Good

AK604321

Start

Yes

Yes

Yes

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-244

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).

a. Transaxle: 2nd
b. Drive with wide open throttle

c. Engine: 3,500 r/min

• The output voltages should be between 0.6 and 1.0 

volt.

(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 :  Go to Step 2.

STEP 2. Measure the sensor output voltage at heated 
oxygen sensor (rear) connector D-37 by backprobing
(1) Do not disconnect the connector D-37.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 3 and ground by 

backprobing under the following driving.

a. Transaxle: 2nd
b. Drive with wide open throttle

c. Engine: 3,500 r/min or more

• The output voltage should be between 1.0 and 1.5 

volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 3.
NO :  Go to Step 7.

STEP 3. Check harness connector B-10 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

AK604183

1 2
3 4

AG

D-37 harness
connector:
harness side 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-245

STEP 4. Measure the sensor output voltage at ECM 
connector B-10 by using power plant ECU check harness 
special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant 

ECU check harness special tool MB992110 between the 
separated connectors.

(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 40 and ground 

by backprobing under the following driving.

a. Transaxle: 2nd
b. Drive with wide open throttle

c. Engine: 3,500 r/min or more

• The output voltage should be between 1.0 and 1.5 

volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 1.0 and 1.5 volts?

YES : Go to Step 5.
NO :  Go to Step 6.

AK604040

ECM

AB

Body side harness 

MB992110

AK604186

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

Power plant ECU
check harness connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-246

STEP 5. Using scan tool MB991958, check data list item 
AD: Heated Oxygen Sensor (rear).
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item 

AD, Heated Oxygen Sensor (rear).

a. Transaxle: 2nd
b. Drive with wide open throttle

c. Engine: 3,500 r/min or more

• The output voltage should be between 0.6 and 1.0 

volt.

(3) 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. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code 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 12.

STEP 6. Check harness connector D-37 at heated oxygen 
sensor (rear) for damage.
Q: Is the harness connector in good condition?

YES : Check harness connector A-13 and C-129 at 

intermediate connector for damage, and repair or 
replace as required. Refer to GROUP 00E, Harness 
Connector Inspection 

P.00E-2

. If intermediate 

connector is in good condition, repair harness wire 
between heated oxygen sensor (rear) connector D-37 
(terminal No. 3) and ECM connector B-10 (terminal 
No. 40) because of open circuit or harness damage. 
Then go to Step 12.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

STEP 7. 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 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.