Mitsubishi Lancer Evolution X. Manual — part 430

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-785

AK704582

Connector: A-28X

Starter relay

A-28X

AB

AK704255AB

Connector: A-39

A-39 (B)

AK704295AB

B-10 (GR)

B-09 (GR)

ECM

Connectors: B-09, B-10

AK704584AB

Connector: B-17

B-17 (B)

AK704583

B-109 (B)

AB

Connectors: B-108, B-109

B-108

AK704361AB

Connector: C-51

C-51

AK704352AB

Connector: C-210

C-210

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-786

.

CIRCUIT OPERATION

• If the clutch interlock switch is ON (when the

clutch pedal is depressed.) and the ignition
switch is turned to "START" position, battery pos-
itive voltage is supplied to starter relay coil. With
this, the starter relay turns "ON" the battery posi-
tive voltage is supplied to the starter motor (termi-
nal No. 1) from the battery.

.

COMMENT

• Faulty starting system and the related circuit are

suspected to be the causes.

.

TROUBLESHOOTING HINTS (The most
likely causes for this case:)

• Battery failed
• Malfunction of the starter motor relay.
• Malfunction of the starter motor.
• Open circuit or short circuit in the starting system

or the related circuit or poor contact in the con-
nectors

• Malfunction of the clutch interlock switch.
• Malfunction of the ECM

DIAGNOSIS

Required Special Tools:

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

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

AK704359AB

Connectors: C-304, C-315

ETACS-ECU

C-304

C-315

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-787

STEP 1. Using scan tool MB991958, check data list item 79:
Cranking signal.

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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item

79, Cranking Signal.

• When the engine is stopped, "OFF" will be displayed.
• When the engine is cranked, "ON" will be displayed.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the operating properly?

YES : Go to Step 9.
NO : Go to Step 2.

STEP 2. Check harness connector C-304, C-315 at
ETACS-ECU connector for damage.
Q: Is the 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 confirm that the

malfunction symptom is eliminated.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-788

STEP 3. Measure the ignition switch-ST signal voltage at
ETACS-ECU harness side connector C-315.
(1) Disconnect the connector C-315 and measure at the

harness side.

(2) Turn the ignition switch to the "START" position.
(3) Measure the voltage between terminal No. 7 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 6.
NO : Go to Step 4.

STEP 4. Check harness connector C-210 ignition switch
connector for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 5. Check the ignition switch
Refer to GROUP 54A, Ignition Switch − Inspection − Ignition

Switch Continuity Check

P.54A-31

.

Q: Are there any abnormalities?

YES : Replace the Ignition Switch. Then confirm that the

malfunction symptom is eliminated.

NO : Repair harness wire between Ignition Switch

connector C-210 (terminal No. 5) and ETACS-ECU
connector C-315 (terminal No. 7) because of open
circuit or short circuit to ground. Then confirm that the
malfunction symptom is eliminated

STEP 6. Check for harness damage between ignition
switch connector C-210 (terminal No. 5) and ETACS-ECU
connector C-315 (terminal No. 7).
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

12

6

11

2

5

10

19 18

16

17

9 8 7

15 14 13

1

4 3

AK704318

C-315 harness
connector:
component side

AB