Mitsubishi Galant (2004+). Manual - part 854

 

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Mitsubishi Galant (2004+). Manual - part 854

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-233

STEP 10. Check for harness damage between cylinder 1, 4 
injector connector and PCM connector.

a. Check the harness wire between injector connector B-01 

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

b. Check the harness wire between injector connector B-27 

(terminal No. 2) and PCM connector B-23 (terminal No. 
139) when checking No. 4 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 12.

STEP 11. Check the fuel pressure.
Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13A-1104

.

Q: Is the fuel pressure normal?

YES : Replace the PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

STEP 12. 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.13A-5

.

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

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

M

1

2

AK303822

B-01 (GR)

B-27 (GR)

CONNECTORS: B-01, B-27

AB

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) <2.4L ENGINE>

13A-234

DTC P0135: Cylinder 1, 4 Heated Oxygen Sensor Heater Circuit (sensor 1)

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

AK303823

1

2

3

4

TO PCM TO PCM

RED-

WHITE

RED

RED-WHITE

WHITE-BLA

CK

CYLINDER 1, 4 HEATED

OXYGEN SENSOR (FRONT)

B-17X

1

2

3

4

BATTERY

1

3

2

4

126

MFI
RELAY

B-37

MU802665

POWERTRAIN
CONTROL
MODULE (PCM)

Cylinder 1, 4 Heated Oxygen Sensor (front) Heater Circuit

B-23

RED-

WHITE

AK303803AB

CONNECTOR: B-17X

MFI RELAY

B-17X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-235

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal 

No. 4) to the cylinder 1, 4 heated oxygen sensor 
(front) heater.

• The PCM (terminal No. 126) controls continuity to 

the cylinder 1, 4 heated oxygen sensor (front) 
heater by turning the power transistor in the PCM 
"ON" and "OFF".

.

TECHNICAL DESCRIPTION

• The PCM checks whether the heater current is 

within a specified range when the heater is ener-
gized.

.

DESCRIPTIONS OF MONITOR METHODS
Cylinder 1, 4 heated oxygen sensor heater (front) 

current is out of specified range when engine 
coolant temperature is over 20

°C (68°F).

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Engine coolant temperature sensor

.

AK303059

CONNECTOR: B-23

PCM

AB

AIR CLEANER

B-23

AK303820AB

CONNECTOR: B-37

CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)

B-37 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-236

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 60 seconds have elapsed from the start of the 

previous monitoring.

• Engine coolant temperature is higher than 20°C 

(68

°F).

• While the cylinder 1, 4 heated oxygen sensor 

(front) heater is on.

• Battery positive voltage is between 11 and 16.5 

volts.

Judgment Criteria

• The cylinder 1, 4 heated oxygen sensor (front) 

heater current has continued to be lower than 
0.16 ampere or higher than 7.5 ampere for 4 sec-
onds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

 Other Monitor 

P.13A-5

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Open or shorted cylinder 1, 4 heated oxygen sen-

sor (front) heater circuit, harness damage or con-
nector damage.

• Open circuit in cylinder 1, 4 heated oxygen sen-

sor (front) heater.

• PCM failed.

START

END

YES

YES

YES

YES

NO

NO

NO

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 4secs

MONITORING

CONDITIONS

CURRENT

< 0.16A

CURRENT

> 7.5A

AK302023

 

 

 

 

 

 

 

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