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)

121

122

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125

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127

128

129

130

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140

141

142

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144

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)

121

122

123

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125

126

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128

129

130

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133

134

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141

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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

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

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)

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

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)

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

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139

140

141

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144

145

146

Harness side connector