Mitsubishi Galant (2004+). Manual — part 1286

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-837

STEP 3. Measure the power supply voltage at throttle
actuator control motor relay harness side connector B-14X

CAUTION

Because it is not possible to distinguish the top and the
bottom of the throttle actuator control motor relay, inspect
with the triangle mark printed on the relay connector at the
wiring harness, inspect it by using triangle mark on the
junction block as a reference.
(1) Disconnect the connector B-14X and measure at the

harness side.

(2) Measure the voltage between terminal No. 1 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 4.
NO : Check harness connector A-13 at intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connector A-13 is

in good condition, repair it because of open circuit or
short circuit to ground between relay box (9) and
throttle actuator control motor relay connector B-14X
(terminal No. 1). Then go to Step 14.

1

2

3

4

AK303175

CONNECTOR: B-14X

FRONT OF VEHICLE

B-14X

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RELAY BOX

AK303186AB

B-14X HARNESS
CONNECTOR:
COMPONFNT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-838

STEP 4. Measure the power supply voltage at throttle
actuator control motor relay harness side connector
B-14X.

CAUTION

Because it is difficult to distinguish the top and the bottom
of the throttle actuator control motor relay connector at the
wiring harness, inspect it by using triangle mark on the
junction block as a reference. to
(1) Disconnect the connector B-14X and measure at the

harness side.

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

(3) Measure the voltage between terminal No. 2 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 6.
NO : Go to Step 5.

1

2

3

4

AK303175

CONNECTOR: B-14X

FRONT OF VEHICLE

B-14X

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RELAY BOX

AK303189AB

B-14X HARNESS
CONNECTOR:
COMPONFNT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-839

STEP 5. 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 throttle actuator control
motor relay connector B-14X (terminal No. 1)
because of open circuit or short circuit to ground.
Then go to Step 14.

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

Connector Inspection

P.00E-2

. Then go to Step 14.

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-840

STEP 6. Measure the power supply voltage at PCM harness
side connector B-23.

(1) Disconnect the connector B-23 and measure at the harness

side.

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

(3) Measure the voltage between terminal No. 123 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 7.
NO : Repair harness wire between throttle actuator control

motor relay connector B-14X (terminal No. 3) and
PCM connector B-23 (terminal No. 123) because of
open circuit or short circuit to ground. Then go to Step
14.

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

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

AK303182

B-23 HARNESS
CONNECTOR:
COMPONENT SIDE

AB