Mitsubishi Lancer Evolution X. Manual - part 248

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-57

.

CIRCUIT OPERATION

• The intake engine oil control valve power is sup-

plied from the MFI relay (terminal No. 2).

• The ECM controls ground intake engine oil con-

trol valve by turning the power transistor in the 
ECM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• The intake engine oil control valve change the 

phase angle to operate the MIVEC system in the 
advance or retard side in accordance with the 
signals from the ECM.

.

DESCRIPTIONS OF MONITOR METHODS

Intake engine oil control valve circuit current is out of 

the specified range.

.

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)

• Camshaft position sensor
• Crankshaft position sensor
• Engine coolant temperature sensor
• Throttle position sensor
• Engine oil control valve

.

AK704226

Connector: A-34X

MFI relay

A-34X

AB

AK704255AB

Connector: A-39

A-39 (B)

AK704227

Connector: B-09

ECM

B-09 (GR)

AB

AK704291

AB

Power steering
oil pump

Connector: B-20

B-20

Intake engine
oil control valve

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-58

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Ignition switch is "ON" position
• Battery positive voltage is between 10 and 16.5 

volts.

• ON duty cycle of the intake engine oil control 

valve circuit is higher than 20 percent.

Judgement Criterion

• The ECM terminal current of intake engine oil 

control valve circuit is less than 0.1 ampere for 2 
seconds.

Check Conditions

• Ignition switch is "ON" position

• Battery positive voltage is between 10 and 16.5 

volts.

Judgement Criterion

• The ECM terminal current of intake engine oil 

control valve circuit is higher than 2.9 amperes 
for 0.1 second.

.

FAIL-SAFE AND BACKUP FUNCTION

• V.V.T.phase angle (intake) becomes most 

retarded angle.

.

AK704777

Start

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

Continuous

failure for 2secs

Continuous

failure for 0.1sec

Current < 0.1A

Current > 2.9A

Malfunction

End

Good

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-59

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 20 

P.13A-9

.

.

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

• Intake engine oil control valve failed.
• Open or shorted intake engine oil control valve 

circuit, or harness damage, or connector dam-
age.

• ECM failed. 

DIAGNOSIS

Required Special Tools:

• MB992110: Power Plant ECU Check Harness

STEP 1. Check harness connector B-20 at the intake 
engine oil control valve for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 10.

STEP 2. Check the intake engine oil control valve.
(1) Disconnect the intake engine oil control valve connector 

B-20.

(2) Measure the resistance between intake engine oil control 

valve side connector terminal No. 1 and No. 2.

Standard value: 6.9 − 7.9 Ω [at 20° C (68° F)]

Q: Is the measured resistance between 6.9 and 7.9 Ω [at 

20° C (68° F)]?
YES : Go to Step 3.
NO :  Replace the intake engine oil control valve. Then go 

to Step 10.

STEP 3. Measure the power supply voltage at intake 
engine oil control valve harness side connector B-20.
(1) Disconnect the connector B-20 and measure at the harness 

side.

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

AK704082

1 2

AB

Intake engine oil
control valve connector

AK704145

2 1

AC

B-20 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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

YES : Check harness connector A-39 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 MFI 
relay connector A-34X (terminal No. 2) and intake 
engine oil control valve connector B-20 (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-09 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.