Mitsubishi Eclipse. Manual — part 315
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-753
.
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)
AK300060
ECM
CONNECTOR: C-53 <M/T>
AH
C-53 (G)
AK300060AD
C-50 (GR)
PCM
CONNECTOR: C-50 <A/T>
AK300124
CONNECTOR: C-111
AB
C-111
AK300116
CONNECTOR: C-87
AB
C-87
AK300123
CONNECTOR: C-108
AB
C-108
AK300119
CONNECTOR: C-28
AB
C-28
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-754
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Shorted the malfunction indicator lamp (SER-
VICE ENGINE SOON or Check Engine Lamp)
and ECM <M/T> or PCM <A/T>.
DIAGNOSIS
Required Special Tools:
• MB991958 (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 the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step. 2.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-755
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
. If intermediate connectors is in
good condition, repair harness wire between
combination meter connector C-41 (terminal No. 41)
and ECM connector C-53 (terminal No. 36) <M/T> or
PCM connector C-50 (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
.
CIRCUIT OPERATION
• Refer to, Ignition circuit system
.
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.
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) <2.4L>
13A-756
DIAGNOSIS
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
• The voltage should be 8 volts or more.
Q: Is the voltage normal?
YES : Go to Step 2.
NO : Check the battery. Refer to GROUP 54A, Battery
−
Battery check
. 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 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
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
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