Mitsubishi Galant (2004+). Manual - part 1234

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-629

STEP 2. Measure the EGR valve motor coil resistance.

(1) Disconnect the EGR valve connector B-105.

(2) Measure the resistance between EGR valve connector 

terminal No. 2 and either terminal No. 4 or terminal No. 6.

Standard value: 20 

− 24 ohms [at 20°C (68°F)]

(3) Measure the resistance between EGR valve connector 

terminal No. 5 and either terminal No. 1 or terminal No. 3.

Standard value: 20 

− 24 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 20 and 24 ohms [at 

20

°C (68°F)]?

YES : Go to Step 3.
NO :  Replace the EGR valve. Then go to Step 12.

1

2 3

4

5 6

AK303137AB

B-105(GR)

CONNECTOR: B-105

EGR 
VALVE

BRAKE FLUID
RESERVOIR

HARNESS 
CONNECTOR: 
COMPONENT SIDE

1

2 3

4

5 6

1

2 3

4

5 6

AK202951

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-630

STEP 3. Measure the power supply voltage at EGR valve 
motor harness side connector B-105.

(1) Disconnect the connector B-105 and measure at the 

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 2, No. 5 and 

ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 5.
NO :  Go to Step 4.

STEP 4. Check harness connector B-17X at MFI relay for 
damage.

Q: Is the harness connector in good condition?

YES : Repair harness wire between MFI relay connector 

B-17X (terminal No. 4) and EGR valve connector 
B-105 (terminal No. 2, No. 5) because of open circuit 
or short circuit to ground. Then go to Step 12.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

1

2 3

4

5 6

AK303137AB

B-105(GR)

CONNECTOR: B-105

EGR 
VALVE

BRAKE FLUID
RESERVOIR

HARNESS 
CONNECTOR: 
COMPONENT SIDE

1

2

3

4

5

6

AK303139

B-105 HARNESS 
CONNECTOR: 
CONPONENT SIDE

AB

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RELAY BOX

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-631

STEP 5. Measure the power supply voltage at PCM 
connector B-23 by using power plant ECU check harness 
special tool MB991923.

(1) Disconnect the all PCM connectors and connect power 

plant ECU check harness special tool MB991923 between 
the separated connectors.

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AB

AIR CLEANER

AK202954

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AB

POWER PLANT ECU 
CHECK HARNESS CONNECTOR

MB991923

PCM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-632

(2) Measure the voltage between terminal (No. 124, No. 130, 

No. 136, No. 142) and ground.

• The voltage should be between 5 and 8 volts for approx-

imately 3 seconds when the Ignition switch is turned 
from the "LOCK" (OFF) position to the "ON" position.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 8.
NO :  Go to Step 6.

STEP 6. Check harness connector B-23 at PCM for 
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 7.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK202955AB

POWER PLANT ECU 
CHECK HARNESS 
CONNECTOR 

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AB

AIR CLEANER