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Mitsubishi Lancer Evolution X. Manual - part 322

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-353

CIRCUIT OPERATION

• The turbocharger wastegate solenoid 1 power is

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

• The ECM controls ground the turbocharger

wastegate solenoid 1 by turning the power tran-
sistor in the ECM "ON" and "OFF".

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the turbo-

charger wastegate solenoid 1 drive circuit, the
ECM measures the surge voltage of the turbo-
charger wastegate solenoid 1 coil.

• The ECM drives the turbocharger wastegate

solenoid 1. After the solenoid is turned off, the
ECM will check if the solenoid coil produces a
surge voltage of 2 volts or more.

DESCRIPTIONS OF MONITOR METHODS

If a surge current is not generated in the coil after the

turbocharger wastegate solenoid 1 has been
actuated, an open circuit is determined to have
occurred.

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

AK704406AB

Connector: A-10

A-10 (BR)

ECM

Turbocharger wastegate
solenoid 1

AK704229AB

Connector: A-13

A-13

AK704226

Connector: A-34X

MFI relay

A-34X

AK704227

Connector: B-09

ECM

B-09 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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DTC SET CONDITIONS
Logic Flow Chart

Check Conditions

• Engine is being cranked.
• Battery positive voltage is between 10 and 16.5

volts.

Judgement Criteria

• The turbocharger wastegate solenoid 1 coil surge

voltage (battery positive voltage + 2 volts) is not
detected for 0.2 second.

• The ECM monitors for this condition once during

the drive cycle.

Check Conditions

• Battery positive voltage is between 10 and 16.5

volts.

• ON duty cycle of the turbocharger wastegate

solenoid 1 is between 10 and 90 percent.

• 1 second or more has elapsed after the above

mentioned conditions have been met.

Judgement Criterion

• The turbocharger wastegate solenoid 1 coil surge

voltage (battery positive voltage + 2 volts) is not
detected for 1 second after the turbocharger
wastegate solenoid 1 is turned off.

FAIL-SAFE AND BACKUP FUNCTION

• None

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle −

Pattern 23

P.13A-9

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

• Turbocharger wastegate solenoid 1 failed.
• Open or shorted turbocharger wastegate sole-

noid 1 circuit, harness damage, or connector
damage.

• ECM failed.

End

Was surge voltage

(> VB + 2V) detected?

Good

AK604339

Malfunction

Start

Yes

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DIAGNOSIS

Required Special Tools:

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

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

• MB992110: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check actuator test
item 20: Turbocharger Wastegate Solenoid.

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 actuator test mode for item

20, Turbocharger wastegate solenoid.

• An operation sound should be heard and vibration

should be felt when the turbocharger wastegate sole-
noid 1 is operated.

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

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How

Cope with Intermittent Malfunctions

P.00-15

NO : Go to Step 2.

STEP 2. Check harness connector A-10 at the
turbocharger wastegate solenoid 1 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 10.

AC608435

Data link connector

MB991827

MB991824

MB991910

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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STEP 3. Check the turbocharger wastegate solenoid 1.
(1) Disconnect the turbocharger wastegate solenoid 1

connector A-10.

(2) Measure the resistance between turbocharger wastegate

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

Standard value: 29 − 35 Ω [at 20° C (68° F)]

Q: Is the measured resistance between 29 and 35 Ω [at

20° C (68° F)]?
YES : Go to Step 4.
NO : Replace the turbocharger wastegate solenoid 1. Then

go to Step 10.

STEP 4. Measure the power supply voltage at turbocharger
wastegate solenoid 1 harness side connector A-10.
(1) Disconnect the connector A-10 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 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 5.

STEP 5. Check harness connector A-34X at MFI relay for
damage.
Q: Is the harness connector in good condition?

YES : Repair harness wire between MFI relay connector

A-34X (terminal No. 2) and turbocharger wastegate
solenoid 1 connector A-10 (terminal No. 1) 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 6. Check harness connector B-09 at the ECM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 10.

AK203522

Turbocharger wastegate
solenoid 1 connector

AK000254AQ

A-10 harness
connector:
component side

2 1

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