Mitsubishi Grandis. Manual — part 746

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-235

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-06
electronic-controlled throttle valve connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace.

STEP 2. Perform resistance measurement at B-06
electronic-controlled throttle valve connector.

• Disconnect connector, and measure at

electronic-controlled throttle valve side.

• Resistance between terminal No. 1 and No. 2.

OK: 0.3

− 100 kΩ (at 20 °C)

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace throttle body assembly.

STEP 3. Connector check: C-114 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair or replace.

AK300972

1

6 5 4 3 2

AC

Harness side connector

Connectors: B-06

B-06 (B)

AK300972

1

6 5 4 3 2

AC

Harness side connector

Connectors: B-06

B-06 (B)

AK305623AB

Connector: C-114

<L.H. drive vehicles>

<R.H. drive vehicles>

C-114 (GR)

C-114 (GR)

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145

146

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-236

STEP 4. Perform resistance measurement at
C-114 engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Disconnect connector and measure at harness

side.

• Resistance between terminal No. 144, No. 145

and earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 5 .

STEP 5. Connector check: C-115 earth connector

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair or replace.

AK305623AB

Connector: C-114

<L.H. drive vehicles>

<R.H. drive vehicles>

C-114 (GR)

C-114 (GR)

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144

145

146

Harness side connector

AK305626

Connector: C-115

<L.H. drive vehicles>

<R.H. drive vehicles>

C-115

C-115

Harness side connector

AB

4 3

2 1

11 10 9

5

6

7

8

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-237

STEP 6. Check harness between C-114
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> and C-115 earth connector.

a. Check harness between C-114 (terminal No. 144)

engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> and C-115 earth
connector.

b. Check harness between C-114 (terminal No. 145)

engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> and C-115 earth
connector.

Q: Are the check results normal?

YES :

Go to Step 7 .

NO :

Repair

STEP 7. Check harness between B-06 (terminal
No. 1) electronic-controlled throttle valve
connector and C-114 (terminal No. 133)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Check output line for short circuit and damage.

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Repair.

AK305623AB

Connector: C-114

<L.H. drive vehicles>

<R.H. drive vehicles>

C-114 (GR)

C-114 (GR)

121

122

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133

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139

140

141

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144

145

146

Harness side connector

AK300972

1

6 5 4 3 2

AC

Harness side connector

Connectors: B-06

B-06 (B)

AK305623AB

Connector: C-114

<L.H. drive vehicles>

<R.H. drive vehicles>

C-114 (GR)

C-114 (GR)

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122

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128

129

130

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132

133

134

135

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139

140

141

142

143

144

145

146

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-238

STEP 8. Check harness between B-06 (terminal
No. 2) electronic-controlled throttle valve
connector and C-114 (terminal No. 141)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Check output line for short circuit and damage.

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair.

STEP 9. Check the trouble symptoms.

Q: Is the check result normal?

YES :

Replace engine-ECU <M/T> or

engine-A/T-ECU <A/T>.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

AK300972

1

6 5 4 3 2

AC

Harness side connector

Connectors: B-06

B-06 (B)

AK305623AB

Connector: C-114

<L.H. drive vehicles>

<R.H. drive vehicles>

C-114 (GR)

C-114 (GR)

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146

Harness side connector