Mitsubishi Montero (2002-2004). Manual - part 674

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

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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 idle air control motor 
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 is 1volt or lower for approximately 3 sec-

onds, then changes to the battery positive voltage 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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HARNESS 
CONNECTOR: 
COMPONENT SIDE

B-56(GR)

CONNECTOR: B-56

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B-56 HARNESS 
CONNECTOR: 
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B-22X

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CONNECTOR: B-22X

HARNESS 
CONNECTOR: 
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CONNECTOR: 
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TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-394

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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CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)

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HARNESS 
CONNECTOR: 
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CONNECTOR: B-56

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HARNESS CONNECTOR: 
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PCM

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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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)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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STEP 9. Check the EGR valve operation using special tool 
MB991658.
(1) Remove the EGR valve.

(2) Connect special tool MB991658 to the EGR valve. (All 

terminals should be connected.)

(3) Use the jumper wires to connect terminal No. 2 of the EGR 

valve onnector to the positive battery terminal.

(4) Check the ensure that the motor operates when the 

terminal No. 1 and No. 3 of the EGR valve connector are 
respectively connected to the negative battery terminal 
using a jumper wire.

• Vibration should be present at each application of volt-

age to test clip combination.

(5) Then. Use jumper wires to connect the terminal No. 5 of the 

EGR valve connector to the positive battery terminal.

(6) Check the ensure that the motor operates when the 

terminal No. 4 and No. 6 of the EGR valve connector are 
respectively connected to the negative battery terminal 
using a jumper wire.

• Vibration should be present at each application of volt-

age to test clip combination.

(7) Reinstall the EGR valve, using a new gasket, and tighten to 

the specified torque.

Tighten torque : 24 

± 3 N⋅m [17 ± 3 ft⋅Ib]

Q: Is the EGR valve operating properly?

YES : Go to Step 10.
NO :  Replace the EGR valve. Then go to Step 12.

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HARNESS 
CONNECTOR: 
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CONNECTOR: B-56

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BATTERY

MB991658

AC