Mitsubishi Evolution X. Manual - part 285

 

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Mitsubishi Evolution X. Manual - part 285

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-117

STEP 4. Check harness connector A-34X at MFI relay for 
damage.
Q: Is the harness connector in good condition?

YES : Repair harness wire between MFI relay connector 

A-34X (terminal No. 2) and mass airflow sensor 
connector A-07 (terminal No. 2) because of open 
circuit or short circuit to ground. Then go to Step 10.

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

Connector Inspection 

P.00E-2

. Then go to Step 10.

STEP 5. Check harness connector B-10 at ECM 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 10.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-118

STEP 6. 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.

(3) Measure the voltage between terminal No. 87 and ground.

• When the engine is revved, voltage should be increase 

in response to revving.

Q: Is the measured voltage normal?

YES : Go to Step 9.
NO :  Go to Step 7.

STEP 7. Check for open circuit and short circuit to ground 
between mass airflow sensor connector A-07 (terminal No. 
3) and ECM connector B-10 (terminal No. 87).
Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO :  Repair it. Then go to Step 10.

AK604171

ECM

AB

Body side harness 

MB992110

82 81 80 79 78 77 76 75 74 73 72 71

94 93 92 91 90 89 88 87 86 85 84 83

99 98 97 96 95

100

101

102

103

104

105

106

112

113

114

109 108

107

110

111

115

116

117

118

AK604176 AB

Power plant ECU
check harness connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-119

STEP 8. Replace the mass airflow sensor.
(1) Replace the mass airflow sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Pattern 23 

P.13A-9

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0102 set?

YES : 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-12

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 10.

NO :  The inspection is complete.

STEP 9. Using scan tool MB991958, check data list item 10: 
Mass Airflow Sensor.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item 

10, Mass Airflow Sensor.

(3) Warm up the engine to normal operating temperature: 80

° C 

to 95

° C (176° F to 203° F).

• The standard value during idling should be between 

1,300 and 1,650 millivolts.

• When the engine is revved, the mass airflow rate should 

increase according to the increase in engine speed.

(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. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-12

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 10.

STEP 10. 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 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0102 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-120

DTC P0103: Mass Airflow Circuit High Input

AK704233

71 72 73 74 75 76 77 78 79 80 81 82

83 84 85 86 87 88 89 90 91 92 93 94

95 96 97 98 99

100 101 102 103 104

112 113 114

109

108

107

110 111

115 116

106

105

118

117

1

3

2

4

3 4

2

1

AB

MASS AIRFLOW SENSOR CIRCUIT

MASS AIRFLOW SENSOR

87

88

3

2

HEAT
SENSITIZING
RESISTANCE

BLUE

A-07

(MU805110)

4

20A

WHITE

WHITE

WHITE

A-34X

4

3

1

2

22

B-10

36

FUSIBLE LINK

OFF

ON

RELAY BOX
(ENGINE COMPARTMENT)

ENGINE
CONTROL
MODULE

TO ECM

MFI
RELAY

BLA

CK-BLUE

 

 

 

 

 

 

 

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