Mitsubishi Galant (2004+). Manual - part 1135

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-233

STEP 10. Check harness connector B-22, B-23 at PCM for 
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 11.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 13.

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) <3.8L ENGINE>

13B-234

STEP 11. Check for harness damage between right bank 
heated oxygen sensor (front) connector B-09 (terminal No. 
4) and PCM connector B-22 (terminal No. 92).

Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO :  Repair it. Then go to Step 13.

1

2

3

4

AK303048

B-09 (B)

CONNECTOR: B-09

THROTTLE BODY

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AB

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-235

STEP 12. Check for harness damage between right bank 
injector connector and PCM connector.

a. Check the harness wire between right bank injector connec-

tor B-01 (terminal No. 2) and PCM connector B-23 (terminal 
No. 153) when checking No. 1 cylinder.

b. Check the harness wire between right bank injector connec-

tor B-03 (terminal No. 2) and PCM connector B-23 (terminal 
No. 140) when checking No. 3 cylinder.

c. Check the harness wire between right bank injector connec-

tor B-04 (terminal No. 2) and PCM connector B-23 (terminal 
No. 133) when checking No. 5 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO :  Repair it. Then go to Step 14.

STEP 13. Check the fuel pressure.

Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13B-1133

.

Q: Is the fuel pressure normal?

YES : Replace the PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13B-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0134 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK303055

M

1

2

CONNECTOR: B-01, B-03, B-04

AB

B-01 (GR)

B-03 (GR)

B-04 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-236

DTC P0135: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 1)

TO PCM

TO PCM

RED-

WHITE

AK302841

RED-WHITE

WHITE-BLA

CK

RIGHT BANK HEATED
OXYGEN SENSOR (FRONT)

B-17X

1

2

3

4

BATTERY

1

3

2

4

126

MFI
RELAY

3

1 2

4

B-09

MU802605

POWERTRAIN
CONTROL
MODULE (PCM)

Right Bank Heated Oxygen Sensor (front) Heater Circuit

B-23

RED-

WHITE

RED-

WHITE

1

2

3

4

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

147 148 149 150 151 152 153