Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 174

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-395

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.13A-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.13A-20

).

NO : Go to Step 5.

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-396

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

−

Ignition Timing

Check (

P.11A-6

).

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.13A-442

).

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

c. Item 25: Barometric pressure Sensor.

d. Item 59: 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 11:
heated oxygen sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item

11, 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 (sensor 1) (

P.13A-109

), DTC P0133

−

Oxygen Sensor Circuit Slow Response (sensor 1)
(

P.13A-118

).

AKX01177

16 PIN

MB991502

AB

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-397

STEP 8. Using scan tool MB991502, check data list item 11:
Heated oxygen sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item

11, Heated Oxygen Sensor (front).

•

Voltage should fluctuate between 0

−

0.4 volts and 0.6 -

1.0 volts while after the engine has been warmed.

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

Q: Is the sensor operating properly?

YES : Go to Step 9.
NO : Go to Step 11.

STEP 9. Check the EGR system.
Refer to GROUP 17, Emission Control System

−

EGR System

Check (

P.17-98

).

Q: Is the EGR system normal?

YES : Go to Step 10.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 10. Using scan tool MB991502, check data list item
59: Heated oxygen sensor (rear).

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) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

59, Heated Oxygen Sensor (rear).

•

Average voltage should be 0.6 volts or less, when idling.

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

Q: Is the sensor operating properly?

YES : Go to Step 12.
NO : Replace the heated oxygen sensor (front). Then

confirm that the malfunction symptom is eliminated.

STEP 11. Check the fuel pressure.
Refer to, Fuel Pressure Test (

P.13A-475

).

Q: Is the fuel pressure normal?

YES : Go to Step 12.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

AKX01177

16 PIN

MB991502

AB

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-398

STEP 12. 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 crankcase ventilation system.
e. Check the evaporative emission control 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 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 Tool:
MB991502: Scan Tool (MUT-II)

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.13A-20

).

NO : Refer to GROUP 17, Emission Control System-Purge

Control System Check (Purge Flow Check) (

P.17-92

).

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.

AKX01177

16 PIN

MB991502

AB