Mitsubishi Eclipse. Manual — part 189
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-249
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 60°C
(140
°F).
• Engine speed is at between 1,500 and 3,000
r/min <M/T> or 1,200 and 3,000 r/min <A/T>.
• Volumetric efficiency is at between 21 and 60
<M/T> or 30 and 60 <A/T> percent.
• Under the closed loop air/fuel control.
• The throttle valve is open.
• Short-term fuel trim is higher than −25 and lower
than +25 percent.
• More than 2 seconds have elapsed after the
above mentioned conditions have been met.
• The ECM<M/T> or PCM<A/T> monitors for this
condition for 7 cycles of 10 second each during
the drive cycle.
Judgment Criteria
• The heated oxygen sensor (front) sends "lean"
and "rich" signals alternately 8 times or less for
10 seconds.
NOTE: If the sensor switching frequency is lower
than the Judgment Criteria due to the MB991958
OBD-II test Mode
−
H02S Test Results, it is assumed
that the heated oxygen sensor has deteriorated. If it
is higher, it is assumed that the harness is damaged
or has a short circuit.
If the heated oxygen sensor signal voltage has not
changed even once (lean/rich) after the DTC was
erased, the sensor switch time will display as 0 sec-
onds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 4
− Heated Oxygen Sensor Monitor
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Heated oxygen sensor (front) deteriorated.
F1: THRESHOLD VALUE FOR REAL-TIME SWITDHING FREQUENCY
F0: THRESHOLD VALUE FOR AVERAGE SWITDHING FREQUENCY
START
MONITORING
CONDITIONS
MALFUNCTION
GOOD
END
NO
NO
YES
YES
Ff < F0
CALCULATE AVERAGE SWITCHING
FREQUENCY (Ff) OVER SPECIFIED TIMES
AK301438
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-250
DIAGNOSIS
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• MD998464: Test Harness
STEP 1. Using scan tool MB991958, check data list item 11:
Heated Oxygen Sensor (front).
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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
39, Heated Oxygen Sensor (front).
(4) Warm-up the engine, 2,500 r/min.
• Output voltage repeats 0.4 volt or less and 0.6 − 1.0 volt
10 times or more within 10 seconds.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
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-251
STEP 2. Check the heated oxygen sensor (front).
(1) Disconnect the heated oxygen sensor (front) connector
B-17 and connect test harness special tool, MD998464, to
the connector on the heated oxygen sensor (front) side.
(2) Warm-up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
CAUTION
Be very careful when connecting the jumper wires; incor-
rect connection can damage the right bank heated oxygen
sensor (front).
(3) Use the jumper wires to connect terminal No. 1 (red clip) to
the positive battery terminal and terminal No. 3 (blue clip) to
the negative battery terminal.
(4) Connect a digital volt meter between terminal No. 2 (black
clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the right
bank heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
Q: Is the voltage between 0.6 and 1.0 volt?
YES : Go to Step 3.
NO : Replace the heated oxygen sensor (front). Then go to
Step 4.
AK300403
1
2
3
4
AB
B-17 (B)
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-17
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01625AC
BLUE
RED
BLACK
JUMPER
WIRES
WHITE
MD998464
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-252
STEP 3. Check harness connector B-17 at heated oxygen
sensor (front) and harness connector C-60 at ECM <M/T>
or C-54, C-57 at PCM <A/T> for damage.
Q: Is the harness connector in good condition?
YES : Replace the ECM or PCM. Then go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 4.
AK300403
1
2
3
4
AB
B-17 (B)
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-17
HARNESS
CONNECTOR:
COMPONENT SIDE
AK300415
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
CONNECTOR: C-60 <M/T>
AB
C-60 (G)
HARNESS CONNECTOR:
COMPONENT SIDE
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