Mitsubishi Lancer Evolution X. Manual — part 248
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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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
.
.
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
. 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)
13A-60
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
. 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
. 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
. Then go to Step 10.
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