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Mitsubishi Outlander GS45X. Manual - part 908

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-565

CIRCUIT OPERATION

• The EGR valve power is supplied from the MFI

relay (terminal No. 2).

• The ECM (terminals No. 31, No. 32, No. 47, No.

48) drives the stepper motor by sequentially turn-
ing "ON" the power transistors in the ECM and
providing ground to the EGR valve (terminal No.
1, No. 3, No. 4, No. 6).

TECHNICAL DESCRIPTION

The ECM checks whether a short circuit to the
ground or an open circuit exists or not by measuring
the EGR valve (stepper motor) drive circuit voltage
when the current is not flowing through the coils of
the EGR valve (stepper motor).

DESCRIPTIONS OF MONITOR METHODS

When the EGR valve (stepper motor) drive circuit
voltage is under the specified range, it is judged that
a malfunction exists.

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)

• EGR stepper motor monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Manifold absolute pressure sensor

• Accelerator pedal position sensor

AK700432

Exhaust gas
recirculation valve

B-12 (GR)

Connector: B-12

AK700401AB

ECM

B-10 (GR)

Connector: B-10

AK700399AB

MFI relay

A-33X

Connector: A-33X

AK900602

Connector: A-13

A-13

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-566

DTC SET CONDITIONS
Logic Flow Chart

Check Conditions

• Ignition switch is "ON" position.

• Battery positive voltage is at between 10 and

16.5 volts.

Judgement Criterion

• When the EGR valve is de-energized, the ECM

voltage should be 1.5 volts or less for 1.4 sec-
onds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 3

P.13B-11

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

• EGR valve (stepper motor) failed.

• Harness damage.

• Connector damage.

• ECM failed.

End

Malfunction

Good

Stepper motor activation

command ON?

AK900363

Start

Yes

Continuous

failure for 1.4secs

Monitoring
conditions

Circuit voltage

6.7V

Circuit voltage

< 1.5V

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-567

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991658: Test Harness Set

STEP 1. Check harness connector B-12 at EGR valve and
harness connector B-10 at ECM 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 6.

STEP 2. Measure the EGR valve motor coil resistance.
(1) Disconnect the EGR valve connector B-12.
(2) Measure the resistance between EGR valve connector

terminal No. 2 and either terminal No. 1 or terminal No. 3.

Standard value: 20

− 24 Ω [at 20°C (68°F)]

(3) Measure the resistance between EGR valve connector

terminal No. 5 and either terminal No. 4 or terminal No. 6.

Standard value: 20

− 24 Ω [at 20°C (68°F)]

Q: Is the measured resistance between 20 and 24 ohms [at

°C (68°F)]?

YES : Go to Step 3.
NO : Replace the EGR valve. Then go to Step 6.

2 3

5 6

2 3

5 6

AK700535

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-568

STEP 3. Measure the power supply voltage at EGR valve
motor harness side connector B-12.
(1) Disconnect the connector B-12 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2, No. 5 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 4.
NO : Repair harness wire between MFI relay connector

A-33X (terminal No. 2) and EGR valve connector
B-12 (terminal No. 2, No. 5) because of open circuit or
short circuit to ground. Then go to Step 6.

STEP 4. Check for open circuit and short circuit to ground
and harness damage between EGR valve connector B-12
and ECM connector B-10.
(1) Disconnect the connector B-12 and B-10 measure at the

harness side.

(2) Measure the resistance between connector B-12 and

connector B-10.

a. Connector B-12 (terminal No. 1) and connector B-10

(terminal No. 31).

b. Connector B-12 (terminal No. 3) and connector B-10

(terminal No. 32).

c. Connector B-12 (terminal No. 4) and connector B-10

(terminal No. 47).

d. Connector B-12 (terminal No. 6) and connector B-10

(terminal No. 48).

• Should be less than 2 ohms.

(3) Check for the continuity between connector B-12 and

ground.

a. Connector B-12 (terminal No. 1) and ground.
b. Connector B-12 (terminal No. 3) and ground.

c. Connector B-12 (terminal No. 4) and ground.

d. Connector B-12 (terminal No. 6) and ground.

• Not continuity.

Q: Is the harness wire in good condition?

YES : Then go to Step 5.
NO : Repair it. Then go to Step 6.

AK700536AB

B-12 harness connector:
component side

AK700537

16 15 14 13 12 11 10 9 8 7 6 5 4 3

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

B-12 harness
connector:
component side

B-10 harness connector:
component side

AK700538AB

B-12 harness
connector:
component side

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