Mitsubishi Outlander GS45X. Manual - part 935

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-673

STEP 2. Check for open circuit or short circuit to ground or 
harness damage between accelerator pedal position 
sensor connector C-123 and ECM connector B-11.
(1) Disconnect the connector C-123 and B-11 measure at the 

harness side.

(2) Measure the resistance between connector C-123 and 

connector B-11.

a. Connector C-123 (terminal No. 1) and connector B-11 

(terminal No. 75).

b. Connector C-123 (terminal No. 3) and connector B-11 

(terminal No. 74).

• Should be less than 2 ohms.

(3) Check for the continuity between connector C-123 and 

ground.

a. Connector C-123 (terminal No. 1) and ground.
b. Connector C-123 (terminal No. 3) and ground.

• Not continuity.

Q: Is the harness wire in good condition?

YES : Go to Step 3.
NO :  Repair it. Then go to Step 4.

AK703896

82 81 80 79 78 77 76 75 74 73 72 71

94 93 92 91 90 89 88 87 86 85 84 83

99 98 97 96 95

100

101

102

103

104

105

106

112

113

114

109 108

107

110

111

115

116

117

118

1

6 5 4 3 2

C-123 harness connector:
component side 

B-11 harness connector:
component side 

AB

AK700280

1

6 5 4 3 2

AB

C-123 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-674

STEP 3. Using scan tool MB991958, check data list item 11: 
Accelerator Pedal Position Sensor (main).

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 

11, Accelerator Pedal Position Sensor (main).

• Output voltage is between 0.9 and 1.1 volts when foot is 

released from accelerator pedal.

• Output voltage is 4.0 volts or higher when accelerator 

pedal is fully depressed.

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

YES : Go to Step 4.
NO :  Replace the accelerator pedal position sensor. Then 

go to Step 4.

STEP 4. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P2122 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Codes Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

.

NO :  It can be assumed that this malfunction is intermittent. 

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

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-675

DTC P2123: Accelerator Pedal Position Sensor (main) Circuit High Input

.

CIRCUIT OPERATION

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

tor pedal position sensor (main) power terminal 
(terminal No. 1) from the ECM (terminal No. 75).

• A votage that is according to the accelerator 

opening angle is sent to the ECM (terminal No. 
74) from the accelerator pedal position sensor 
(main) output terminal (terminal No. 3).

• The ground terminal (terminal No. 2) is grounded 

with ECM (terminal No. 76).

.

AK700162

71 72 73 74 75 76 77 78 79 80 81 82

83 84 85 86 87 88 89 90 91 92 93 94

95 96 97 98 99

100 101 102 103 104

112 113 114

109

108

107

110 111

115 116

106

105

118

117

6

1 2 3 4 5

AB

5 V

75

1

WHITE-GREEN

GRA

Y

GREEN-WHITE

74

76

3

2

ACCELERATOR PEDAL POSITION SENSOR (MAIN) CIRCUIT

ACCELERATOR
PEDAL POSITION
SENSOR (MAIN)

B-11

C-123

HALL IC

ENGINE
CONTROL
MODULE

AK700431

AB

Accelerator pedal
position sensor

C-123 (B)

Connector: C-123

AK700402AB

ECM

B-11 (GR)

Connector: B-11

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-676

TECHNICAL DESCRIPTION

• The accelerator pedal position sensor (main) out-

puts voltage which corresponds to the accelera-
tor pedal depression.

• The ECM checks whether the voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

Accelerator pedal position sensor (main) output volt-

age is out of specified 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

.

DTC SET CONDITIONS

Logic Flow Chart

.

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• Accelerator pedal position sensor (main) output 

voltage should be 4.8 volts or higher for 0.3 sec-
ond.

.

OBD-II DRIVE CYCLE PATTERN

None.

.

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

• Accelerator pedal position sensor failed.

• Connector damage.

• Harness damage.

• ECM failed.

AK604360

Good

Malfunction

End

No

No

Output voltage >= 4.8V

Start

Yes

Yes

Continuous

failure for 0.3sec