Mitsubishi Eclipse. Manual — part 595

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-923

.

CIRCUIT OPERATION

• The malfunction indicator lamp (SERVICE

ENGINE SOON or Check Engine Lamp) power is
supplied from the ignition switch.

• The ECM <M/T> or PCM <A/T> controls the

ground of the malfunction indicator lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) by
turning the power transistor in the ECM <M/T> or
PCM <A/T> ON and OFF.

.

COMMENT

• In cases such as the above, the cause is proba-

bly that the ECM <M/T> or PCM <A/T> is detect-
ing a problem in a sensor or actuator, or that one
of the malfunctions listed at right has probably
occurred.

.

AK300072

CONNECTOR: C-41

AB

C-41 (B)

AK300124

CONNECTOR: C-111

AB

C-111

AK300123

CONNECTOR: C-108

AB

C-108

AK300119

CONNECTOR: C-28

AB

C-28

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

AK300116

CONNECTOR: C-87

AB

C-87

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-924

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

• Short-circuit between the malfunction indicator

lamp (SERVICE ENGINE SOON or Check
Engine Lamp0000000000) and ECM <M/T> or
PCM <A/T>.

• Malfunction of the ECM <M/T> or PCM <A/T>.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

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 DTC set?

YES : Refer to Diagnostic Trouble Code Chart

P.13B-23

.

NO : Go to Step. 2.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-925

STEP 2. Check the continuity at combination meter
harness side connector C-41.
(1) Disconnect the connector C-41 and measure at the harness

side.

(2) Check for the continuity between terminal No. 41 and

ground.

• Should be open loop.

Q: Is the continuity normal?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Check harness connectors C-28 at the intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connectors is in

good condition, repair harness wire between
combination meter connector C-41 (terminal No. 41)
and ECM connector C-51 (terminal No. 22) <M/T> or
PCM connector C-52 (terminal No. 22) <A/T>
because of short circuit to ground. Then confirm that
the malfunction symptom is eliminated.

INSPECTION PROCEDURE 5: Cranks, Won't Start

.

Cranks, Won't Start Circuit

• Refer to, Ignition circuit system

P.13B-1053

.

.

CIRCUIT OPERATION

• Refer to, Ignition circuit system

P.13B-1053

.

.

COMMENT

• In cases such as the above, the cause is proba-

bly no spark, fuel delivery, or fuel quality prob-
lems. In addition, foreign materials (water,
kerosene, etc.) may be mixed with the fuel.

.

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

• Malfunction of the ignition system.

• Malfunction of the fuel pump system.

• Malfunction of the injector system.

• Malfunction of the ECM <M/T> or PCM <A/T>.

• Contaminated fuel.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

AK300741

44

45

41

46

47

42

43

49

50

51

52

48

55

56

54 53

CONNECTOR: C-41

AB

C-41 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000445AD

56 55 54 53 52 5150 49 48

47 46 45 44 43 42 41

C-41 HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-926

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

• A tachometer move.

Q: Does a tachometer move?

YES : Go to Step 2.
NO : Check the battery. Refer to GROUP 54A, Battery

−

Battery check

P.54A-5

. Then confirm that the

malfunction symptom is eliminated.

STEP 2. Check the timing belt for breaks.
Q: Is the timing belt good condition?

YES : Go to Step 3.
NO : Replace timing belt. Then confirm that the malfunction

symptom is eliminated.

STEP 3 Using scan tool MB991958, check data list.

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 or MB991958 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-1062

.

a. Item 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.

c. Item 21: Engine Coolant Temperature Sensor.

(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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824