Mitsubishi Eclipse. Manual - part 599

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-939

INSPECTION PROCEDURE 7: Hard Starting

.

COMMENT

• In cases such as the above, the cause is usually 

either weak spark, improper air-fuel mixture or 
low compression.

.

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

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor fuel quality. (Contamination)

• Poor compression.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage is 8 volts or more.

Q: Does the voltage remain greater than 8 volts while the 

engine is cranked?
YES : Go to Step 2. 
NO :  Refer to GROUP 54A, Battery 

− Battery check 

P.54A-5

.

STEP 2. 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 DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13B-23

. 

NO :  Go to Step 3.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-940

STEP 3. Using scan tool MB991958, 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.13B-1078

.

a. Item 07: Fuel Pump.

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

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

symptom is eliminated.

STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch the "ON" position.
(2) Check the following items in the data list. Refer to Data List 

Reference Table 

P.13B-1062

.

a. Item 21: Engine Coolant Temperature Sensor.

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

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

symptom is eliminated.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-941

STEP 5. Check the ignition timing.
(1) Check the ignition timing at cranking.

Standard value: 5

°BTDC ± 3°

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. Check the left bank injector.
(1) Disconnect the left bank injector connector B-02, B-06, 

B-25.

(2) Measure the resistance between each injector side 

connector terminals No. 1 and No. 2.

Standard value: 13 

− 16 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 13 and 16 ohms?

YES : Go to Step 7.
NO :  Replace the faulty injector. Then confirm that the 

malfunction symptom is eliminated.

AK300753

1

2

CONNECTORS: B-02, B-06, B-25

AB

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-942

STEP 7. Check the right bank injector resistance at injector 
intermediate connector B-48.
(1) Disconnect the injector intermediate connector B-48.

(2) Measure the resistance between each male connector side 

terminal.

a. Measure the resistance between terminals No. 1 and 

No. 2 when measuring No. 1 cylinder injector.

b. Measure the resistance between terminals No. 1 and 

No. 3 when measuring No. 3 cylinder injector.

c. Measure the resistance between terminals No. 1 and 

No. 4 when measuring No. 5 cylinder injector.

Resistance should be between 13 and 16 ohms [at 20

°C 

(68

°F)].

Q: Is the measured resistance between 13 and 16 ohms?

YES : Go to Step 10.
NO :  Go to Step 8.

STEP 8. Check the right bank injector.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector, which 

deviates from the standard value at Step 7.

(3) Measure the resistance between injector side connector 

terminals No. 1 and No. 2.

Standard value: 13 

− 16 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 13 and 16 ohms?

YES : Go to Step 9.
NO :  Replace the injector. Then confirm that the 

malfunction symptom is eliminated.

AK300751

1

2

3

4

CONNECTOR: B-48

AB

B-48 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000447

1 2

3 4

INJECTOR
INTERMEDIATE
CONNECTOR

AB

AK300752

1

2

CONNECTORS: B-01, B-05, B-26

AB

B-05 (GR) B-26 (GR)

B-01 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB