Mitsubishi Lancer Evolution X. Manual - part 251

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-69

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 exhaust engine oil control 

valve circuit is higher than 20 percent.

Judgement Criterion

• The ECM terminal current of exhaust 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 exhaust 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 (exhaust) becomes most 

advanced 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

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-70

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:)

• Exhaust engine oil control valve failed.
• Open or shorted exhaust 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-01 at the exhaust 
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 exhaust engine oil control valve.
(1) Disconnect the exhaust engine oil control valve connector 

B-01.

(2) Measure the resistance between exhaust 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 exhaust engine oil control valve. Then go 

to Step 10.

STEP 3. Measure the power supply voltage at exhaust 
engine oil control valve harness side connector B-01.
(1) Disconnect the connector B-01 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.

AK704083

1 2

AB

Exhaust engine oil
control valve connector

AK704148

2 1

AC

B-01 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-71

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 exhaust 
engine oil control valve connector B-01 (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.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-72

STEP 6. Measure the power supply 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. 17 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 7.
NO :  Repair harness wire between exhaust engine oil 

control valve connector B-01 (terminal No. 1) and 
ECM connector B-09 (terminal No. 17) because of 
open circuit or short circuit to ground. Then go to Step 
10.

STEP 7. Check for harness damage between MFI relay 
connector A-34X (terminal No. 2) and exhaust engine oil 
control valve connector B-01 (terminal No. 2).
NOTE: Check harness after checking intermediate connector 
A-39. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 10.
Q: Is the harness wire in good condition?

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

AK604040

ECM

AB

Body side harness 

MB992110

AK604222

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