Mitsubishi Montero (2004+). Manual — part 303

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-699

.

CIRCUIT OPERATION

• Power to the intake manifold tuning solenoid

power is supplied from the MFI relay (terminal
No. 1).

• The PCM controls ground intake manifold tuning

solenoid by turning the power transistor in the
PCM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the intake man-

ifold tuning solenoid drive circuit, PCM measures
the surge voltage of the intake manifold tuning
solenoid coil.

• The PCM drives the intake manifold tuning sole-

noid. After the solenoid is turned off, the PCM will
check if the solenoid coil produces a surge volt-
age of 2 volts or more.

.

DESCRIPTIONS OF MONITOR METHODS

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

the intake manifold tuning solenoid 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

.

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-700

DTC SET CONDITIONS <Circuit continuity (during cranking/when solenoid ON to OFF)>

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

• Battery positive voltage is between 10 and 16

volts.

Judgment Criteria

• The evaporative emission ventilation solenoid

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

• Only one monitor during one drive cycle.

Check Conditions

• Battery positive voltage is between 10 and 16

volts.

• Intake manifold tuning solenoid is ON.

• More than 1 second has elapsed after the above

mentioned conditions have been met.

Judgment Criteria

• The evaporative emission ventilation solenoid

coil surge voltage (battery positive voltage + 2
volts) is not detected for 1 second.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• Intake manifold tuning solenoid failed.

• Open or shorted intake manifold tuning solenoid

circuit, harness damage, or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

MONITORING

CONDITIONS

NO

NO

YES

YES

GOOD

MALFUNCTION

WAS SURGE VOLTAGE

(> VB+2V) DETECTED?

START

END

AK302954

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-701

STEP 1. Using scan tool MB991958, check actuator test
item 11: Variable Induction control 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

11, Intake manifold tuning solenoid.

• An operation sound should be heard and vibration

should be felt when the intake manifold tuning solenoid
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

P.00-6

.

NO : Go to Step 2.

STEP 2. Check connector B-04 at the intake manifold
tuning solenoid 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 go to Step 12.

AK302970

AB

MB991911

MB991824

MB991827

AK200971

1

2

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

CONNECTOR: B-04

B-04(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-702

STEP 3. Check the intake manifold tuning solenoid.
(1) Disconnect the intake manifold tuning solenoid connector

B-04.

(2) Measure the resistance between intake manifold tuning

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

Standard value: 29

− 35 ohms [at 20°C (68°F)]

Q: Is the resistance between 29 and 35 ohms [at 20

°C

(68

°F)]?

YES : Go to Step 4.
NO : Replace the intake manifold tuning solenoid. Then go

to Step 12.

STEP 4. Measure the power supply voltage at intake
manifold tuning solenoid harness side connector B-04.
(1) Disconnect the connector B-04 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.

AK200971

1

2

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

CONNECTOR: B-04

B-04(B)

AK201425

AK200971

1

2

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

CONNECTOR: B-04

B-04(B)

AK103038

1

2

B-04 HARNESS
CONNECTOR:
COMPONENT SIDE

AC