Mitsubishi Galant (2004+). Manual - part 1123

 

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Mitsubishi Galant (2004+). Manual - part 1123

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-185

STEP 12. Check harness connector B-22 at PCM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 13.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

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-186

STEP 13. Check for harness damage between engine 
coolant temperature sensor connector B-104 (terminal No. 
1) and PCM connector B-22 (terminal No. 93).
Q: Is the harness wire in good condition?

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 P0125 set?

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

1

2

AK303037

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-104

AB

B-104 (B)

THROTTLE
BODY

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-187

DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

.

TECHNICAL DESCRIPTION

• The PCM checks the time for the cooling water 

temperature to reach the judgment temperature.

.

DESCRIPTIONS OF MONITOR METHODS
Engine coolant temperature does not reach 77

°C 

(171

°F) within specified period after cold start.

.

MONITOR EXECUTION
Once per driving cycle

.

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)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

.

DTC SET CONDITIONS

Logic Flow Chart

.

START

END

YES

NO

NO

YES

MALFUNCTION

GOOD

TIME HAVE PASSED

AFTER STARTING?*

ENGINE COOLANT TEMP.

>=77˚C (171˚F)

*: See DTC SET CONDITIONS-JUDGMENT CRITERIA

MONITORING

CONDITIONS?

NO

YES

AK204044

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-188

Check Conditions

• Engine coolant temperature is between −10°C 

(14

°F) and 77°C (171°F) when the engine is 

started.

• The engine coolant temperature − intake air tem-

perature is 5

°C (9°F) or less when the engine is 

started.

• The intake air temperature when the engine is 

started 

− intake air temperature is 5°C (9°F) or 

less.

• The total time of the mass airflow sensor output 

whose state is below 15g/sec be within 
300seconds.

Judgment Criteria

• The time for the engine coolant temperature to 

rise to 77

°C (171°F) takes longer than approxi-

mately 7 to 16 minutes.

• The PCM monitors for this condition once during 

the drive cycle.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• The thermostat is faulty.

• PCM failed.

DIAGNOSIS

STEP 1. Check the cooling system.
Refer to Engine Cooling Diagnosis 

P.14-3

.

Q: Is the cooling system normal?

YES : Replace the PCM. Then check that the DTC P0128 

does not reset.

NO :  Repair it. Then check that the DTC P0128 does not 

reset.

 

 

 

 

 

 

 

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