Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 170

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-379

STEP 1. Check if the battery terminal is disconnected

Q: Has the battery terminal been disconnected lately?

YES : Start the engine and let it run at idle for approximate

10 minutes after engine warm up. Then if a
malfunction occurs, go to step 2.

NO : Go to Step 2.

STEP 2. 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 3.

STEP 3. Using scan tool MB991502, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to, Data List

Reference Table (

P.13A-442

).

a. Item 14: Throttle Position Sensor.

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

Q: Is the sensor operating properly?

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

symptom is eliminated.

STEP 4. Using scan tool MB991502, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to,

Actuator Test Reference Table (

P.13A-450

).

a. Item 10: EGR Solenoid.

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

Q: Is the actuator operating properly?

YES : Go to Step 5.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

AKX01177

16 PIN

MB991502

AB

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-380

STEP 5. Using scan tool MB991502, check data list item 45:
Idle Air Control Position.
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item

45, Idle Air Control Position.

a. The idle air control motor should drop to the 0 - 2

position during deceleration (from 1,000 r/min or more).

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

Q: Is the actuator operation properly?

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

clean the defective sections.

a. Check the ignition coil, spark plugs, spark plug

cables.

b. Check the throttle valve area.

Then confirm that the malfunction symptom is

eliminated.

NO : Refer to, DTC P0500

−

Vehicle Speed Sensor

Malfunction <M/T (

P.13A-280

)>, <A/T (

P.13A-288

)>.

INSPECTION PROCEDURE 15: Hesitation, sag or stumble.

COMMENT

•

In cases such as the above, the ignition system,
air/fuel mixture or compression pressure may be
defective.

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

•

Malfunction of the ignition system.

•

Malfunction of air/fuel ratio control system.

•

Malfunction of the fuel supply system.

•

Malfunction of the EGR solenoid system.

•

Poor compression pressure.

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 : Go to Step 2.

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-381

STEP 2. Using scan tool MB991502, check actuator test
items 01, 02, 03, 04: Injector.
(1) Check following items in the actuator test. Refer to, Actuator

Test Reference Table (

P.13A-450

).

a. Item 01, 02, 03, 04: Injector.

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

Q: Is the actuator operating properly?

YES : Go to Step 3.
NO : Refer to, DTC P0201, P0202, P0203, P0204

−

Injector Circuit Malfunction (

P.13A-161

).

STEP 3. Check the ignition timing.
(1) Refer to GROUP 11A, On-vehicle Service

−

Ignition Timing

Check (

P.11A-6

).

Q: Is the ignition timing normal?

YES : Go to Step 4.
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 4. 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 13: Intake Air Temperature Sensor.
b. Item 25: Barometric pressure Sensor.

c. Item 21: Engine Coolant Temperature Sensor.

d. Item 14: Throttle Position Sensor.
e. Item 59: Heated Oxygen Sensor (rear)

f. Item 11: Heated Oxygen Sensor (front)

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

Q: Are they operating properly?

YES : Go to Step 5.
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-382

STEP 5. Using scan tool MB991502, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to,

Actuator Test Reference Table (

P.13A-450

).

a. Item 10: EGR Solenoid.

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

Q: Is the actuator operating properly?

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

symptom is eliminated.

STEP 6. Using scan tool MB991502, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of data list. Refer to, Data List

Reference Table (

P.13A-442

).

a. Item 11: Heated Oxygen Sensor (front)

•

Voltage should fluctuate between 0

−

0.4 volts and 0.6 -

1.0 volts while idling after the engine has warmed-up.

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

Q: Is the sensor operating properly?

YES : Go to Step 8.
NO : Go to Step 7.

STEP 7. Check the fuel pressure.
Refer to, Fuel Pressure Test (

P.13A-475

).

Q: Is the fuel pressure normal?

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

defective items.

a. Vacuum leak.

•

Broken intake manifold gasket.

•

Broken air intake hose.

•

Broken vacuum hose.

•

Positive crankcase ventilation valve does
not operate.

b. Injector clogged.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

AKX01177

16 PIN

MB991502

AB

AKX01177

16 PIN

MB991502

AB