Mitsubishi Montero Sport (2004+). Manual - part 182

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-141

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 14: 
Throttle Position Sensor.

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 data reading mode for item 

14, Throttle Position Sensor.

• With the throttle valve in the idle position, voltage should 

measure between 0.535 and 0.735 volt.

• With the throttle valve in the full-open position, voltage 

should measure between 4.5 and 5.5 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-7

.

NO :  Go to Step 2.

STEP 2. Check connector A-41 at throttle position sensor 
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 14.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK000363

AK104027

4 3 2 1

CONNECTOR: A-41

AB

HARNESS CONNECTOR:
COMPONENT SIDE

A-41(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-142

STEP3. Check the throttle position sensor.
(1) Disconnect the connector A-41.

(2) Measure the resistance between throttle position sensor 

side connector terminal No. 1 and No. 4.

Standard value: 3.5 

− 6.5 kΩ

(3) Measure resistance between the throttle position sensor 

side connector terminal No. 1 and No. 3.

(4) Move the throttle valve from the idle position to the full-open 

position.

• Resistance should change smoothly in proportion to the 

opening angle of the throttle valve.

Q: Is the resistance normal?

YES : Go to Step 4.
NO :  Replace the throttle position sensor. Refer to Throttle 

Body Assembly 

− Disassembly And Assembly 

P.13A-903

 . Then go to Step 14.

STEP 4. Measure the sensor supply voltage at throttle 
position sensor harness side connector A-41.
(1) Disconnect the connector A-41 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 between 4.8 and 5.2 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 7.
NO :  Go to Step 5.

AK000363

AK104027

4 3 2 1

CONNECTOR: A-41

AB

HARNESS CONNECTOR:
COMPONENT SIDE

A-41(B)

AK000320

1 2 3 4

THROTTLE POSITION
SENSOR SIDE
CONNECTOR

AB

AK000363

AK104027

4 3 2 1

CONNECTOR: A-41

AB

HARNESS CONNECTOR:
COMPONENT SIDE

A-41(B)

AK000236AH

A-41 HARNESS 
CONNECTOR: 
COMPONENT SIDE

4 3 2 1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-143

STEP 5. Check connector C-90 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

STEP 6. Check for harness damage between throttle 
position sensor connector A-41 (terminal No. 4) and PCM 
connector C-90 (terminal No. 46).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000363

AK104027

4 3 2 1

CONNECTOR: A-41

AB

HARNESS CONNECTOR:
COMPONENT SIDE

A-41(B)

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-144

STEP 7. Check for continuity at throttle position sensor 
harness side connector A-41.
(1) Disconnect the connector A-41 and measure at the harness 

side.

(2) Measure the continuity between terminal No. 1 and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 10.
NO :  Go to Step 8.

STEP 8. Check connector C-90 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 14.

AK000363

AK104027

4 3 2 1

CONNECTOR: A-41

AB

HARNESS CONNECTOR:
COMPONENT SIDE

A-41(B)

AK000237AG

A-41 HARNESS 
CONNECTOR: 
COMPONENT SIDE

4 3 2 1

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE