Mitsubishi Galant. Manual — part 306

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-449

STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 is output?

YES : Refer to, Diagnostic Trouble Code Chart(

P.13B-19

).

NO : Go to Step 2.

STEP 2. Check the ignition timing.
Refer to GROUP 11C, On-vehicle Service

Ignition Timing

Check (

P.11C-5

).

Q: Is the ignition timing normal?

YES : Go to Step 3.
NO : Check that the crankshaft position sensor and timing

belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.

STEP 3. Using scan tool MB991502, check data list.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the following items in the data list. Refer to, Data List

Reference Table(

P.13B-487

).

a. Item 21: Engine Coolant Temperature Sensor.
b. Item 13: Intake Air Temperature Sensor.

c. Item 25: Barometric pressure Sensor.

d. Item 69: Right Bank Heated Oxygen Sensor (rear)
e. Item 39: Right Bank Heated Oxygen Sensor (front)

f. Item 59: Left Bank Heated Oxygen Sensor (rear)

g. Item 11: Left Bank Heated Oxygen Sensor (front)

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Are they operating properly?

YES : Go to Step 4.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

AC003081 AB

16 PIN

MB991502

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-450

STEP 4. Using scan tool MB991502, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of the data list. Refer to, Data List

Reference Table(

P.13B-487

).

a. Item 39: Right Bank Heated Oxygen Sensor (front)
b. Item 11: Left Bank Heated Oxygen Sensor (front)

Voltage should fluctuate between 0

0.4 volts and 0.6 -

1.0 volts while idling after the engine has been warmed.

(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : Replace the heated oxygen sensor (front). Then

confirm that the malfunction symptom is eliminated. If
not resolved, go to step 6.

NO : Go to Step 5.

STEP 5. Check the fuel pressure.
Refer to, Fuel Pressure Test(

P.13B-522

).

Q: Is the fuel pressure normal?

YES : Go to Step 6.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 6. 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, spark plugs, spark plug cables.

c. Check compression pressure.

d. Check the positive crank case ventilation system.
e. Check the evaporative emission control system.

f. Check the EGR system.

(2) Then check the malfunction symptom.

Q: Is the malfunction symptom is eliminated.

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

malfunction symptom is eliminated.

INSPECTION PROCEDURE 23: Transient, Mass Emission Tailpipe Test Failure.

COMMENT

The test is failed when the air/fuel ratio is not
controlled to the ideal air/fuel ratio. This occurs
due to the feedback control by heated oxygen
sensor signals, insufficient EGR flow rate, or
deteriorated catalyst.

NOTE: If the three-way catalyst temperature is low
when checking the exhaust gas, the three-way
catalyst cannot sufficiently clean the emissions.
Warm up the engine sufficiently before checking the
exhaust, and check immediately.

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

Malfunction of air/fuel ratio control system.

Malfunction of the EGR system.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-451

Deteriorated catalyst.

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Check the exhaust gas with the engine at normal
operating temperature.

Q: After enough warm up, was the exhaust gas checked

enough?
YES :
Go to Step 2.
NO : Check it again after enough warm up.

STEP 2. Check the following items.
(1) Check the following items.

a. Check all vacuum hoses and connectors.
b. Check electrical wires and connectors for obvious

problems.

c. Check the exhaust system for missing or damaged

parts.

Q: Are they normal?

YES : Go to Step 3.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 3. Check the drive ability.
(1) Check if the malfunction symptom described on the

symptom chart is occurring.

Q: Is the drive

−−−−

ability normal?

YES : Go to Step 4.
NO : Refer to, Trouble Symptom Chart(

P.13B-22

).

STEP 4. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 is output?

YES : Refer to, Diagnostic Trouble Code Chart(

P.13B-19

).

NO : Go to Step 5.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-452

STEP 5. Check the ignition timing.
Refer to GROUP 11C, On-vehicle Service

Ignition Timing

Check (

P.11C-5

).

Q: Is the ignition timing normal?

YES : Go to Step 6.
NO : Check that the crankshaft position sensor and timing

belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.

STEP 6. Using scan tool MB991502, check data list.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the following items in the data list. Refer to, Data List

Reference Table(

P.13B-487

).

a. Item 21: Engine Coolant Temperature Sensor.
b. Item 13: Intake Air Temperature Sensor.

c. Item 25: Barometric pressure Sensor.

d. Item 69: Right Bank Heated Oxygen Sensor (rear)
e. Item 59: Left Bank Heated Oxygen Sensor (rear)

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : Go to Step 7.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 7. Using scan tool MB991502, check data list item 39:
Right Bank heated oxygen sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item

39, Right Bank Heated Oxygen Sensor (front).

Warm up the engine. When the engine is decelerated
suddenly from 4000 r/min, the output voltage should
increase from 200 mV or less to 600

1000 mV in a few

seconds.

(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : Go to Step 8.
NO : Refer to, DTC P0130

Oxygen Sensor Circuit

Malfunction (bank 1, sensor 1)(

P.13B-107

), DTC

P0133

Oxygen Sensor Circuit Slow Response

(bank 1, sensor 1)(

P.13B-116

).

AC003081 AB

16 PIN

MB991502

AC003081 AB

16 PIN

MB991502

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Политика конфиденциальности