Mitsubishi Montero Sport (2004+). Manual - part 186

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-157

DTC P0123: Throttle Position Sensor Circuit High Input

5V

GREEN-

YELL

OW

BL

ACK

GREEN-

WHITE

GREEN-

WHITE

BL

ACK

AK000443

Throttle Position Sensor (TPS) Circuit

POWERTRAIN CONTROL MODULE (PCM)

71

76

77

72 73 74

75

79 80

78

81

87 88

89

91

90

92

97

98

82

93

83

94

84 85

95

86

96

C-91
(MU803782)

1 2 3 4

A-41
(MU802724)

THROTTLE POSITION SENSOR

13

12

78

57

3

1

4

C-90

46

47

41

42 43

48 49 50 51 52 53 54 55 56 57

46

45

44

58

59

60 61 62 63

64 65 66

C-90
(MU803781)

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

C-71

AUTO-CRUISE CONTROL SYSTEM

C-91

JOINT
CONNEC-
TOR (4)

AK000363

AK104024

CONNECTOR: A-41

AB

THROTTLE
POSITION
SENSOR

A-41(B)

AK103738AE

CONNECTORS: C-90, C-91

PCM

C-91(GR)

C-90(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-158

.

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. 

.

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

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-159

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

• Engine speed is lower than 1,000 r/min.

• Volumetric efficiency is lower than 60 percent.

Judgement Criteria

• TPS output voltage has continued to be 2 volts or 

higher 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 TPS circuit, or harness damage or connec-

tor damage.

• PCM failed.

START

END

No

No

Yes

Yes

Malfunction

Good

Continuous

Failure for 2secs

Output Voltage

> 2.0V

No

Yes

Monitoring
Conditions

AK302363

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-160

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 8.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK000363

AK104027

4 3 2 1

CONNECTOR: A-41

AB

HARNESS CONNECTOR:
COMPONENT SIDE

A-41(B)