Mitsubishi Grandis. Manual - part 750

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-251

STEP 6. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 78: Accelerator pedal position sensor 

(main)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Replace engine-ECU <M/T> or 
engine-A/T-ECU <A/T>.

STEP 7. Connector check: C-113 engine-ECU 
<M/T> connector or engine-A/T-ECU <A/T> 
connector

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair or replace.

STEP 8. Check harness between C-102 (terminal 
No. 1) accelerator pedal position sensor 
connector and C-113 (terminal No. 92) 
engine-ECU <M/T> connector or engine-A/T-ECU 
<A/T> connector.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair.

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

AK305627

1

6 5 4 3 2

Connector: C-102

AB

C-102 (B)

Harness side
connector

C-102 (B)

<L.H. drive vehicles>

<R.H. drive vehicles>

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-252

STEP 9. Check harness between C-102 (terminal 
No. 3) accelerator pedal position sensor 
connector and C-113 (terminal No. 114) 
engine-ECU <M/T> connector or engine-A/T-ECU 
<A/T> connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Repair.

STEP 10. Replace the accelerator pedal assembly

• After replacing the accelerator pedal assembly, 

re-check the trouble symptoms.

Q: Is the check result normal?

YES : 

Check end.

NO : 

Replace  engine-ECU <M/T> or 
engine-A/T-ECU <A/T>.

AK305627

1

6 5 4 3 2

Connector: C-102

AB

C-102 (B)

Harness side
connector

C-102 (B)

<L.H. drive vehicles>

<R.H. drive vehicles>

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-253

Code No. P2123: Accelerator Pedal Position Sensor (Main) Circuit High Input

OPERATION

• A power voltage of 5 V is applied to the 

accelerator pedal position sensor (terminal No. 1) 
from the engine-ECU <M/T> or engine-A/T-ECU 
<A/T> (terminal No. 92).

• The power voltage is earthed to the engine-ECU 

<M/T> or engine-A/T-ECU <A/T> (terminal No. 
91) from the accelerator pedal position sensor 
(terminal No. 2).

• The sensor signal is inputted to the engine-ECU 

<M/T> or engine-A/T-ECU <A/T> (terminal No. 
114) from the accelerator pedal position sensor 
output terminal (terminal No. 3).

FUNCTION

• The accelerator pedal position sensor (main) 

outputs voltage which corresponds to the 
accelerator pedal depression.

• The engine-ECU <M/T> or engine-A/T-ECU 

<A/T> checks whether the voltage is within a 
specified range.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in ON position.

• Accelerator pedal position sensor (sub) output 

voltage is 0.2 - 2.5 V.

Judgment Criterion

• Accelerator pedal position sensor (main) output 

voltage is 4.5 V or higher for is 1 second.

PROBABLE CAUSE

• Failed accelerator pedal position sensor

• Open/short circuit in accelerator pedal position 

sensor circuit or loose connector contact

• Failed engine-ECU <M/T>

AK305571

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

6

1 2 3 4 5

AB

5 V

92

1

Accelerator
pedal
position
sensor
(main)

Y-G

GR

BR-W

Engine-ECU <M/T> or
engine-A/T-ECU <A/T>

114

91

3

2

Accelerator pedal position sensor (main) circuit

C-113

(MU803805)

C-102 

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet

Hall IC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-254

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 78: Accelerator pedal position sensor 

(main)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Go to Step 2 .

STEP 2. Connector check: C-102 accelerator 
pedal position sensor connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

STEP 3. Perform resistance measurement at 
C-102 accelerator pedal position sensor 
connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Go to Step 4 .

AK305627

1

6 5 4 3 2

Connector: C-102

AB

C-102 (B)

Harness side
connector

C-102 (B)

<L.H. drive vehicles>

<R.H. drive vehicles>

AK305627

1

6 5 4 3 2

Connector: C-102

AB

C-102 (B)

Harness side
connector

C-102 (B)

<L.H. drive vehicles>

<R.H. drive vehicles>