Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 243
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-171
STEP 10. Check the fuel pressure.
Refer to, Fuel Pressure Test (
Q: Is the fuel pressure normal?
YES : Replace the ECM or PCM. Then go to Step 11.
NO : Repair or replace it. Then go to Step 11.
STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,
Procedure 6
−
Other Monitor (
).
(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0154 is output?
YES : Retry the troubleshooting.
NO : The inspection is complete.
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-172
DTC P0155: O
2
Sensor Heater Circuit Malfunction (bank 2 sensor 1)
AK000695
3 4
1 2
3 4
1 2
RED-
WHITE
RED-
WHITE
RED-
WHITE
RED
BR
O
WN-WHITE
BATTERY
A-21X
3
4
1
2
LEFT BANK HEATED
OXYGEN SENSOR(FRONT)
B-24
MU802605
1
2
3
4
TO ECM
OR PCM
TO ECM
OR PCM
ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>
3
MFI
RELAY
C-51<M/T>,C-52<A/T>
(MU803784)
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24 25
26 27 28 29
3132 33
34 35
1
10
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-173
CIRCUIT OPERATION
•
Power is supplied from the MFI relay (terminal 1)
to the left bank heated oxygen sensor (front)
heater.
•
The ECM (terminal 3) <M/T> or PCM (terminal 3)
<A/T> controls continuity to the left bank heated
oxygen sensor (front) heater by turning the power
transistor in the ECM <M/T> or PCM <A/T> "ON"
and "OFF."
TECHNICAL DESCRIPTION
•
The ECM <M/T> or PCM <A/T> checks whether
the heater current is within a specified range
when the heater is energized.
DTC SET CONDITIONS
Check Conditions
•
Engine coolant temperature is higher than 20
°
C
(68
°
F).
•
While the left bank heated oxygen sensor (front)
heater is on.
•
Battery positive voltage is at between 11 and 16
volts.
Judgment Criteria
•
Heater current of the left bank heated oxygen
sensor (front) heater has continued to be lower
than 0.2 ampere or higher than 3.5 ampere for 6
seconds.
•
Only one monitor during one drive cycle
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Open or shorted left bank heated oxygen sensor
(front) heater circuit.
•
Open circuit in left bank heated oxygen sensor
(front) heater.
•
ECM failed. <M/T>
•
PCM failed. <A/T>
DIAGNOSIS
Required Special Tools
MB998464: Test Harness Set
ACX02489AC
CONNECTOR : B-24
LEFT BANK
HEATED OXYGEN
SENSOR
(FRONT)
AK000226
AK000226AB
CONNECTOR : A-21X
MFI RELAY
AK000225
CONNECTOR : C-51<M/T>, C-52<A/T>
C-52
C-51
PCM<A/T>
ECM<M/T>
AJ
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-174
STEP 1. Check connector B-24 at the left bank heated
oxygen sensor (front) for damage.
Q: Is the harness 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.
STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect left bank heated oxygen sensor (front)
connector B-24 and connect test harness special tool,
MD998464, to the connector on the left bank heated
oxygen (front) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal 1 (red clip) and terminal 3 (blue clip).
Standard value: 4.5
−
8.0 ohm [at 20
°
C (68
°
F)]
Q: Is the resistance normal?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 12.
STEP 3. Check the power supply voltage at left bank
heated oxygen sensor (front) harness side connector B-24.
(1) Disconnect the connector B-24 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
•
Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 5.
NO : Go to Step 4.
AK000212AB
AK000212
CONNECTOR : B-24
ACX02489AC
CONNECTOR : B-24
LEFT BANK
HEATED OXYGEN
SENSOR
(FRONT)
AKX01624
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
MD998464
BLUE
RED
AC
AKX01498
2
1
4
3
B-24 HARNESS
SIDE CONNECTOR
AF
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