Mitsubishi Eclipse. Manual — part 473
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-435
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 left bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgment Criteria
• Heater current of the left bank heated oxygen
sensor (rear) heater has continued to be lower
than 0.16 ampere or higher than 5.0 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 left bank heated oxygen sensor
(rear) heater circuit, harness damage.
• Open circuit in left bank heated oxygen sensor
(rear) heater.
• ECM failed. <M/T>
• PCM failed. <A/T>
• Connector damage.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 5.0A
AK301443
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-436
DIAGNOSIS
Required Special Tool:
• MB991316: Test Harness
STEP 1. Check connector B-23 at the left bank heated
oxygen sensor (rear) 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.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-437
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect left bank heated oxygen sensor (rear) connector
B-23 and connect test harness special tool, MB991316, to
the connector on the left bank heated oxygen (rear) sensor
side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 11
− 18 ohms [at 20°C (68°F)]
Q: Is the resistance between 11 and 18 ohms?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (rear).
Then go to Step 12.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-438
STEP 3. Check the power supply voltage at left bank
heated oxygen sensor (rear) harness side connector B-23.
(1) Disconnect the connector B-23 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 left bank heated oxygen
sensor (rear) connector B-23 (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.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01496AN
B-28 HERNESS
CONNECTOR:
COMPONENT SIDE
1
4
3
2
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
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