Mitsubishi Lancer Evolution X. Manual - part 296

 

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Mitsubishi Lancer Evolution X. Manual - part 296

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-249

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

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 speed
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-35 by backprobing
(1) Do not disconnect the connector D-35.
(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 speed
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 8.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AK604183

1 2
3 4

AI

C-35 harness
connector:
harness side 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-250

STEP 3. Check harness connector B-09 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 14.

STEP 4. Measure the sensor output voltage at ECM 
connector B-09 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 speed
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 7.

STEP 5. Check harness connector D-35 at heated oxygen 
sensor (rear) for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

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)

13A-251

STEP 6. 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 speed
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, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 14.

STEP 7. Check harness connector D-35 at heated oxygen 
sensor (rear) for damage.
Q: Is the harness connector in good condition?

YES : Check harness connectors A-13 and C-45 at 

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

P.00E-2

. If intermediate 

connectors are in good condition, repair harness wire 
between heated oxygen sensor (rear) connector D-35 
(terminal No. 3) and ECM connector B-09 (terminal 
No. 40) because of open circuit or harness damage. 
Then go to Step 14.

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

Connector Inspection 

P.00E-2

. Then go to Step 14.

STEP 8. Check harness connector D-35 at heated oxygen 
sensor (rear) for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 9.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

STEP 9. Check harness connector B-09 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 10.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-252

STEP 10. Measure the sensor offset voltage at ECM 
connector B-09 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) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 41 and ground.

• Voltage should be between 0.4 and 0.6 volt.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 0.4 and 0.6 volt?

YES : Go to Step 11.
NO :  Check harness connectors A-13 and C-45 at 

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

P.00E-2

. If intermediate 

connectors are in good condition, repair harness wire 
between headed oxygen sensor (rear) connector 
D-35 (terminal No. 4) and ECM connector B-09 
(terminal No. 41) because of open circuit or harness 
damage. Then go to Step 14.

STEP 11. Check for harness damage between heated 
oxygen sensor (rear) connector D-35 (terminal No. 4) and 
ECM connector B-09 (terminal No. 41).
NOTE: Check harness after checking intermediate connectors 
A-13 and C-45. If intermediate connectors are damaged, repair 
or replace them. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. Then go to Step 14.

Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO :  Repair it. Then go to Step 14.

AK604040

ECM

AB

Body side harness 

MB992110

AK604187

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

 

 

 

 

 

 

 

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