Mitsubishi Galant (2004+). Manual - part 1336

 

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Mitsubishi Galant (2004+). Manual - part 1336

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1037

STEP 12. Using scan tool MB991958, check data list item 
11: Heated oxygen sensor bank 2, sensor 1 (left front).

(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item 

11, Heated Oxygen Sensor bank 2, sensor 1 (left front).

• Warm up the engine. When the engine is decelerated 

suddenly from 4,000 r/min, the output voltage should 
increase from 0.2 volt or less to 0.6 

− 1.0 volt in a few 

seconds.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 13.
NO :  Go to Step 15.

STEP 13. Check the EGR system.

Refer to GROUP 17, Emission Control System 

− General 

Description (EGR System) 

P.17-91

.

Q: Is the EGR system normal?

YES : Go to Step 14.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1038

STEP 14. Using scan tool MB991958, check data list item 
59: Heated oxygen sensor bank 2, sensor 2 (left rear).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

59, Heated Oxygen Sensor bank 2, sensor 2 (left rear).

• Average voltage should be 0.6 volt or less, when idling.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 16.
NO :  Replace the left bank heated oxygen sensor (front). 

Then confirm that the malfunction symptom is 
eliminated.

STEP 15. Check the fuel pressure.

Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13B-1133

.

Q: Is the fuel pressure normal?

YES : Go to Step 16.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 16. Check the following items.
(1) Check the following items, and repair or replace the 

defective items.

a. Check the injectors for fuel leakage.
b. Check the ignition coil and spark plugs.

c. Check compression pressure.

d. Check the positive crankcase ventilation system.
e. Check the evaporative emission system.

(2) Then check the malfunction symptom.
Q: Is the malfunction symptom eliminated?

YES : The check is completed.
NO :  Replace the catalytic converter. Then confirm that the 

malfunction symptom is eliminated.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1039

INSPECTION PROCEDURE 24: Purge Flow Test of the Evaporative Emission Canister Failure.

.

COMMENT

• The test fails when the purge line or purge port is 

clogged or if the evaporative emission purge 
solenoid fails.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Purge line or purge port is clogged.

• Malfunction of the evaporative emission purge 

solenoid.

• Evaporative emission canister is clogged.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13B-33

.

NO :  Refer to GROUP 17, Emission Control System 

− 

Purge Control System Check (Purge Flow Check) 

P.17-88

.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1040

INSPECTION PROCEDURE 25: Pressure Test of the Evaporative System Failure

.

COMMENT

• The test fails if there is a leak from the fuel tank or 

vapor line.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Loose fuel tank filler tube cap.

• Broken seal in fuel tank, vapor line evaporative 

emission canister.

DIAGNOSIS

STEP 1. Check the evaporative emission purge solenoid.

Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission Purge Solenoid Check 

P.17-89

.

Q: Is the evaporative emission purge solenoid normal?

YES : Go to Step 2.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 2. Check the evaporative emission ventilation 
solenoid.

Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission Ventilation Solenoid Check 

P.17-90

.

Q: Is the evaporative emission ventilation solenoid 

normal?
YES : 
Check the following items, and repair or replace the 

defective items.

a. Check for leaks from the vapor line or 

evaporative emission canister.

b. Check for leaks from the fuel tank.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

 

 

 

 

 

 

 

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