Mitsubishi Grandis. Manual - part 748

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-243

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 Ω (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

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-244

STEP 4. 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.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair.

STEP 5. 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.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair.

STEP 6. 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

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-245

Code No. P2103: Throttle Valve Control Servo Circuit (Shorted High)

OPERATION

• Controls the current that is applied from the 

engine-ECU <M/T> or engine-A/T-ECU <A/T> 
(terminals No. 133, No. 141) to the 
electronic-controlled throttle valve (terminals No. 
1, No. 2).

FUNCTION

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

varies the direction and the amperage of the 
current that is applied to the throttle valve control 
servo in order to control the opening of the 
throttle valve.

TROUBLE JUDGMENT

Check Condition

• Battery positive voltage is 8.3 V or higher.

Judgement Criterion

• Throttle actuator control motor current is 8 A or 

higher for 0.8 second.

PROBABLE CAUSE

• Failed throttle valve control servo.

• Short circuit in throttle valve control servo circuit 

or loose connector contact.

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

AK305730

6

1 2 3 4 5

121122

123 124

125126127128129 130 131 132 133

134135

136137 138 139 140 141

142143

144

145 146

AB

133

1

L-Y

R-L

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

141

2

B-06

Throttle valve control servo circuit

C-114

(MU803801)

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

Electronic-controlled
throttle valve

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-246

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 Ω (at 20 °C)

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Replace the 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

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