Mitsubishi Galant 9G. Manual — part 964

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-156

STEP 4. Measure the sensor supply voltage at PCM
connector B-22 by using power plant ECU check harness
special tool MB991923.

(1) Do not disconnect the all PCM connectors and connect

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

(2) Disconnect the engine coolant temperature sensor

connector B-104.

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

AK303016

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

CONNECTOR: B-22

B-22 (B)

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-157

(4) Measure the voltage between terminal No. 93 and ground.

• Voltage should be between 4.5 and 4.9 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 5.
NO : Go to Step 6.

AK202956

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

AB

POWER PLANT ECU
CHECK HARNESS CONNECTOR

MB991923

PCM

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

AK203047AB

POWER PLANT ECU
CHECK HARNESS
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-158

STEP 5. Check harness connector B-22 at PCM for
damage.

Q: Is the harness connector in good condition?

YES : Repair harness wire between engine coolant

temperature sensor connector B-104 (termial No. 1)
and PCM connector B-22 (termial No. 93) because of
open circuit. Then go to Step 11.

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

Connector Inspection

P.00E-2

. Then go to Step 11.

STEP 6. Check harness connector B-22 at PCM for
damage.

Q: Is the harness connector in good condition?

YES : Replace the PCM. Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

AK303016

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

CONNECTOR: B-22

B-22 (B)

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

AK303016

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

CONNECTOR: B-22

B-22 (B)

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-159

STEP 7. Check the continuity at engine coolant
temperature sensor harness side connector B-104.

(1) Disconnect the connector B-104 and measure at the

harness side.

(2) Check for the continuity between terminal No. 2 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 10.
NO : Go to Step 8.

STEP 8. Check harness connector B-21 at PCM for
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

1

2

AK303037

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-104

AB

B-104 (B)

THROTTLE
BODY

AK303040

B-104 HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

AB

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

B-21 (B)