Mitsubishi Montero (2004+). Manual — part 255

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-507

• MD9919658: Test harness Set

STEP 1. Check connector B-56 at EGR valve for damage.
Q: Is the 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 12.

STEP 2. Measure the EGR valve motor coil resistance.
(1) Disconnect the EGR valve connector B-56.

(2) Measure the resistance between EGR valve connector

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

Standard value: 20

− 24 ohms [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 ohms [at 20°C (68°F)]

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

°C

(68

°F)]?

YES : Go to Step 3.
NO : Replace the EGR valve. Then go to Step 12.

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HARNESS
CONNECTOR:
COMPONENT SIDE

B-56(GR)

CONNECTOR: B-56

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HARNESS
CONNECTOR:
COMPONENT SIDE

B-56(GR)

CONNECTOR: B-56

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5 6

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 3. Measure the power supply voltage at EGR valve
motor harness side connector B-56.
(1) Disconnect the connector B-56 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 5.
NO : Go to Step 4.

STEP 4. Check connector B-22X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector

B-22X (terminal No. 1) and EGR valve connector
B-56 (terminal No. 2, No. 5) because of open circuit or
short circuit to ground. Then go to Step 12.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 12.

STEP 5. Measure the power supply voltage at PCM
connector D-132 by backprobing.
(1) Do not disconnect the connector D-132.
(2) Measure the voltage between terminal (No. 3, No. 12, No.

19, No. 26) and ground by backprobing.

• The voltage should be between 5 and 8 volts for approx-

imately 3 seconds when the ignition switch is turned
from the "LOCK" (OFF) position to the "ON" position.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 8.
NO : Go to Step 6.

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AB

HARNESS
CONNECTOR:
COMPONENT SIDE

B-56(GR)

CONNECTOR: B-56

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B-56 HARNESS
CONNECTOR:
COMPONENT SIDE

AG

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B-22X

AB

CONNECTOR: B-22X

HARNESS
CONNECTOR:
COMPONENT SIDE

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232425

2627

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D-132 HARNESS
CONNECTOR:
HARNESS SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 6. Check connector D-132 at PCM for damage.
Q: Is the 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 12.

STEP 7. Check for open circuit and short circuit to ground
between EGR valve connector B-56 and PCM connector
D-132.

a. EGR valve connector B-56 (terminal No. 1) and PCM con-

nector D-132 (terminal No. 3).

b. EGR valve connector B-56 (terminal No. 3) and PCM con-

nector D-132 (terminal No. 12).

c. EGR valve connector B-56 (terminal No. 4) and PCM con-

nector D-132 (terminal No. 19).

d. EGR valve connector B-56 (terminal No. 6) and PCM con-

nector D-132 (terminal No. 26).

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

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AB

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

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HARNESS
CONNECTOR:
COMPONENT SIDE

B-56(GR)

CONNECTOR: B-56

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CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 8. Check connector D-132 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 12.

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CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)