Mitsubishi Galant (2004+). Manual — part 853

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-229

STEP 5. Check the cylinder 1, 4 heated oxygen sensor
(front).
(1) Disconnect the cylinder 1, 4 heated oxygen sensor (front)

connector B-37 and connect test harness special tool
MB991316 to the connector on the cylinder 1, 4 heated
oxygen sensor (front) side.

(2) Warm up the engine until engine coolant temperature

reaches 80

°C (176°F) or higher.

(3) Perform a racing for 5 minutes or more with the engine

speed of 4,500 r/min.

(4) Connect a digital voltage meter between terminal No. 2

(black clip) and terminal No. 4 (white clip).

(5) While repeatedly revving the engine, measure the cylinder

1, 4 heated oxygen sensor (front) output voltage.

Standard value: 0.6

− 1.0 volt

CAUTION

• Be very careful when connecting the jumper wires;

incorrect connection can damage the heated oxygen
sensor (front).

• Be careful the heater is broken when voltage of beyond

8 volts is applied to the heated oxygen sensor (front)
heater.
NOTE: If the sufficiently high temperature [of approximate
400

°

C (752

°

F) or more] is not reached although the heated

oxygen sensor (front) is normal, the output voltage would be
possibly low although the rich air/fuel ratio. Therefore, if the
output voltage is low, use a jumper wire to connect the ter-
minal No. 1 (red clip) and the terminal No. 3 (blue clip) of
the heated oxygen sensor (front) with the positive terminal
and the negative terminal of 8 volts power supply respec-
tively, then check again.

Q: Is the measured voltage between 0.6 and 1.0 volt?

YES : Go to Step 6.
NO : Replace the cylinder 1, 4 heated oxygen sensor

(front). Then go to Step 11.

AK303821

1

2

3

4

AB

CONNECTOR: B-37

CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)

B-37 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01624

HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR

MB991316

WHITE

BLACK

AN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-230

STEP 6. Check harness connector B-01, B-27 at injector 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 11.

STEP 7. Check the cylinder 1, 4 injector.
(1) Disconnect each injector connector.

(2) Measure the resistance between injector side connector

terminal No. 1 and No. 2.

Standard value: 10.5

− 13.5 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 10.5 and 13.5 ohms

[at 20

°C (68°F)]?

YES : Go to Step 8.
NO : Replace the injector. Then go to Step 11.

M

1

2

AK303822

B-01 (GR)

B-27 (GR)

CONNECTORS: B-01, B-27

AB

HARNESS CONNECTOR:
COMPONENT SIDE

M

1

2

AK303822

B-01 (GR)

B-27 (GR)

CONNECTORS: B-01, B-27

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-231

STEP 8. Check harness connector B-22, B-23 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.

AK303057

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

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

CONNECTORS: B-22, B-23

B-22 (B)

AB

B-23

B-22 HARNESS CONNECTOR:
COMPONENT SIDE

B-23 HARNESS CONNECTOR:
COMPONENT SIDE

PCM

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-232

STEP 9. Check for harness damage between cylinder 1, 4
heated oxygen sensor (front) connector B-37 (terminal No.
4) and PCM connector B-22 (terminal No. 92).
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO : Repair it. Then go to Step 11.

AK303821

1

2

3

4

AB

CONNECTOR: B-37

CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)

B-37 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

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