Mitsubishi Eclipse. Manual — part 330
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-813
STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of the data list. Refer to, Data List
Reference Table
a. Item 11: Heated Oxygen Sensor (front).
• Voltage should fluctuate between 0 − 0.4 volt and 0.6 −
1.0 volt while idling after the engine has been warmed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Replace the heated oxygen sensor (front). Then
confirm that the malfunction symptom is eliminated. If
not resolved, go to step 6.
NO : Go to Step 5.
STEP 5. Check the fuel pressure.
Refer to, Fuel Pressure Test
.
Q: Is the fuel pressure normal?
YES : Go to Step 6.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 6. 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 crank case ventilation system.
e. Check the evaporative emission system.
f. Check the EGR 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.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-814
INSPECTION PROCEDURE 23: Transient, Mass Emission Tailpipe Test Failure.
.
COMMENT
• The test is failed when the air/fuel ratio is not con-
trolled to the ideal air/fuel ratio. This occurs due
to the feedback control by heated oxygen sensor
signals, insufficient EGR flow rate, or deteriorated
catalyst.
NOTE: If the three-way catalyst temperature is low
when checking the exhaust gas, the three-way cata-
lyst cannot sufficiently clean the emissions. Warm up
the engine sufficiently before checking the exhaust,
and check immediately.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of air/fuel ratio control system.
• Malfunction of the EGR system.
• Deteriorated catalyst.
DIAGNOSIS
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
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 prob-
lems.
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-815
STEP 4. 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
.
NO : Go to Step 5.
STEP 5. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service
− Ignition Timing
Check
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.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-816
STEP 6. 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 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 MB991958, check data list item 11:
heated oxygen sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item
11, Heated Oxygen Sensor (front).
• Warm up the engine. When the engine is decelerated
suddenly from 4,000 r/min, the output voltage should
increase from 200 millivolts or less to 600
− 1,000 milli-
volts 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
− Heated Oxygen Sensor Circuit
(sensor 1)
, DTC P0131
− Heated Oxygen
Sensor Circuit Low Voltage (sensor 1)
,
DTC P0132
− Heated Oxygen Sensor Circuit High
Voltage (sensor 1)
, DTC P0133
− Heated
Oxygen Sensor Circuit Slow Response (sensor 1)
, DTC P0134
− Heated Oxygen Sensor
Circuit No Activity Detected (sensor 1)
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
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