Mitsubishi Montero (2004+). Manual - part 301

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-691

STEP 3. Measure the power supply voltage at throttle 
actuator control motor relay harness side connector B-23X
(1) Disconnect the connector B-23X and measure at the 

harness side.

(2) Measure the voltage between terminal No. 3 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 4.
NO :  Check harness connector A-03 at intermediate 

connector for damage, and repair or replace as 
required. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. If intermediate connector A-03 is 

in good condition, repair it because of open circuit or 
short circuit to ground between fusible link (5) and 
throttle actuator control motor relay connector B-23X 
(terminal No. 3). Then go to Step 14.

STEP 4. Measure the power supply voltage at throttle 
actuator control motor relay harness side connector 
B-23X.
(1) Disconnect the connector B-23X and measure at the 

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 4 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.

AK201172

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3

4

B-23X

AB

CONNECTOR: B-23X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

2 1

3

4

AK201382AC

B-23X HARNESS
CONNECTOR:
COMPONFNT SIDE

AK201172

2 1

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4

B-23X

AB

CONNECTOR: B-23X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

2 1

3

4

AK201383

B-23X HARNESS
CONNECTOR:
COMPONFNT SIDE

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-692

STEP 5. 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 throttle actuator control 
motor relay connector B-23X (terminal No. 4) 
because of open circuit or short circuit to ground. 
Then go to Step 14.

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

Connector Inspection 

P.00E-2

. Then go to Step 14.

STEP 6. Measure the power supply voltage at PCM harness 
side connector D-132.
(1) Disconnect the connector D-132 and measure at the 

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 15 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 7.
NO :  Repair harness wire between throttle actuator control 

motor relay connector B-23X (terminal No. 2) and 
PCM connector D-132 (terminal No. 15) because of 
open circuit or short circuit to ground. Then go to Step 
14.

AK200951

2 1

3

4

B-22X

AB

CONNECTOR: B-22X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK200938

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AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)

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AK201447

D-132 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-693

STEP 7. Measure the power supply voltage at PCM harness 
side connector D-136.
(1) Disconnect the connector D-136 and measure at the 

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 132 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 10.
NO :  Go to Step 8.

AK201170

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CONNECTOR: D-136

PCM

D-136(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

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AK201448

AB

D-136 HARNESS 
CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-694

STEP 8. Check for open circuit and short circuit to ground 
between throttle actuator control motor relay connector 
B-23X (terminal No. 1) and PCM connector D-136 (terminal 
No. 132).
Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO :  Repair it. Then go to Step 14.

AK201172

2 1

3

4

B-23X

AB

CONNECTOR: B-23X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK201170

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CONNECTOR: D-136

PCM

D-136(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AB