Mitsubishi Lancer Evolution X. Manual - part 369

 

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Mitsubishi Lancer Evolution X. Manual - part 369

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-541

.

Engine Control Module Main Processor 
Malfunction Circuit

• Refer to Inspection Procedure 22 − Power Supply 

System and Ignition Switch-IG System 

P.13A-760

.

.

CIRCUIT OPERATION

• Refer to Inspection Procedure 22 − Power Supply 

System and Ignition Switch-IG System 

P.13A-760

.

.

TECHNICAL DESCRIPTION

• Throttle actuator control processor checks the 

ECM for abnormal conditions.

.

DESCRIPTIONS OF MONITOR METHODS

No watch dog pulse is detected.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITIONS

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• No surveillance pulse signals should be input for 

0.5 second.

.

FAIL-SAFE AND BACKUP FUNCTION

• Throttle opening degree position is in default 

position.

.

OBD-II DRIVE CYCLE PATTERN

None.

.

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

• MFI relay failed.
• Shorted MFI relay circuit or connector damage.
• Open or shorted ignition switch-IG circuit, har-

ness damage or connector damage.

• ECM failed. 

AK800785 AB

Connector: C-304

ETACS-ECU

C-304

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-542

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

STEP 1. Check the battery.
Refer to GROUP 54A, Battery − On-vehicle Service − Battery 

Test 

P.54A-9

.

Q: Are there any abnormalities?

YES : Replace the battery. Then go to Step 11.
NO :  Go to Step 2.

STEP 2. Check harness connector B-10 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 11.

STEP 3. Measure the ignition switch-IG signal voltage at 
ECM harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 92 and ground.

• Voltage should be battery positive voltage.

(4)  Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : 
Go to Step 5.
NO :  Go to Step 4.

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

AK604044 AD

B-10 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-543

STEP 4. Check harness connector C-304 at ETACS-ECU for 
damage.
Q: Is the harness connector in good condition?

YES : Check harness connector C-50 at intermediate 

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

P.00E-2

. If intermediate connector is in 

good condition, repair harness wire between 
ETACS-ECU connector C-304 (terminal No. 10) and 
ECM connector B-10 (terminal No. 92) because of 
open circuit or short circuit to ground. Then go to Step 
11.

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

Connector Inspection 

P.00E-2

. Then go to Step 11.

STEP 5. Check harness connector C-304 at ETACS-ECU 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 11.

STEP 6. Check for harness damage between ETACS-ECU 
connector C-304 (terminal No. 10) and ECM connector B-10 
(terminal No. 92).
NOTE: Check harness after checking intermediate connector 
C-50. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

Then check that the malfunction is eliminated.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair it. Then go to Step 11.

STEP 7. Check harness connector A-34X at MFI relay 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 11.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-544

STEP 8. Check the MFI relay.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals No. 1 

and No. 3.

• There should be continuity.

(3) Use jumper wires to connect MFI relay terminal No. 3 to the 

positive battery terminal and terminal No. 1 to the negative 
battery terminal.

(4) Check for continuity between the MFI relay terminals No. 4 

and No. 2 while connecting and disconnecting the jumper 
wire at the negative battery terminal.

• Continuity (2 ohms or less) <Negative battery terminal 

connected>

• Should be open loop <Negative battery terminal discon-

nected>

(5) Install the MFI relay.
Q: Is the measured resistance within the specified range?

YES : Go to Step 9.
NO :  Replace the MFI relay. Then go to Step 11.

STEP 9. Check for short circuit to ground between MFI 
relay connector A-34X (terminal No. 1) and ECM connector 
B-10 (terminal No. 73).
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO :  Repair it. Then go to Step 11.

AK703903

1

3

2

4

AB

MFI relay side
connector

1

3

2

4

AK703904AB

MFI
relay side
connector 

 

 

 

 

 

 

 

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