Mitsubishi Montero Sport (2004+). Manual — part 184

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-149

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CIRCUIT OPERATION

• A 5-volt power supply is applied on the TPS

power terminal (terminal No. 4) from the PCM
(terminal No. 46).
The ground terminal (terminal No. 1) is grounded
with PCM (terminal No. 57).

• When the throttle valve shaft is turned from the

idle position to the fully opened position, the
resistor between the TPS output terminal (termi-
nal No. 3) and ground terminal will increase
according to the rotation.

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TECHNICAL DESCRIPTION

• The TPS outputs voltage which corresponds to

the throttle valve opening angle.

• The PCM checks whether the voltage is within a

specified range. In addition, it checks that the
voltage output does not become too high while
the engine is at idle.

.

DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor output voltage is out of spec-

ified range.

.

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)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

AK103912AB

CONNECTOR: C-71

C-71

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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DTC SET CONDITIONS

Logic Flow Chart

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Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgement Criteria

• TPS output voltage has continued to be 0.2 volt

or lower for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• TPS failed.

• Open or shorted TPS circuit, or connector dam-

age.

• PCM failed.

START

END

NO

NO

YES

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2 secs

OUTPUT VOLTAGE

< 0.2V

NO

YES

MONITORING

CONDITIONS

AK301429

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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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 10.

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

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MULTIPORT FUEL INJECTION (MFI)

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STEP 3. 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 6.
NO : Go to Step 4.

STEP 4. Check connector C-90 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 10.

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

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