Mitsubishi Eclipse. Manual — part 431
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-267
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the right bank heated oxygen sensor (front)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgment Criteria
• Heater current of the right bank heated oxygen
sensor (front) heater has continued to be lower
than 0.16 ampere or higher than 7.5 ampere for 4
seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Open or shorted right bank heated oxygen sen-
sor (front) heater circuit harness damage, or con-
nector damage.
• Open circuit in right bank heated oxygen sensor
(front) heater.
• ECM failed. <M/T>
• PCM failed. <A/T>
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 7.5A
AK301439
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-268
DIAGNOSIS
Required Special Tool:
• MD998464: Test Harness
STEP 1. Check connector B-27at the right bank heated
oxygen sensor (front) for damage.
Q: Is the connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK300409
1
2
3
4
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
B-27 (B)
CONNECTOR: B-27
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-269
STEP 2. Check the right bank heated oxygen sensor
(front).
(1) Disconnect right bank heated oxygen sensor (front)
connector B-27 and connect test harness special tool,
MD998464, to the connector on the right bank heated
oxygen (front) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 4.5
− 8.0 ohms [at 20°C (68°F)]
Q: Is the resistance between 4.5 and 8.0 ohms?
YES : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (front).
Then go to Step 12.
AK300409
1
2
3
4
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
B-27 (B)
CONNECTOR: B-27
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01624
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
MD998464
BLUE
RED
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-270
STEP 3. Check the power supply voltage at right bank
heated oxygen sensor (front) harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check connector A-18X at the MFI relay for
damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector
A-18X (terminal No. 4) and right bank heated oxygen
sensor (front) connector B-27 (terminal No. 1)
because of open circuit or short circuit to ground Then
go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK300409
1
2
3
4
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
B-27 (B)
CONNECTOR: B-27
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01498 AU
2
1
4
3
B-27 HERNESS
CONNECTOR:
COMPONENT SIDE
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
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