Mitsubishi 380. Manual — part 589

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

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STEP 4. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− EOBD Drive Cycle −

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).

Q: Is DTC P2097 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

MULTIPORT FUEL INJECTION (MPI) DIAG

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DTC P2098: Post Catalyst System too Rich (bank 1)

.

TECHNICAL DESCRIPTION

• The signal from the rear heated oxygen sensor

differs from the front heated oxygen sensor. That
is because the catalytic converter purifies
exhaust gas. When the catalytic converter or oxy-
gen sensor has deteriorated, the signal from the
front heated oxygen sensor becomes similar to
the rear heated oxygen sensor.

• The ECU compares the output of the front and

rear heated oxygen sensor signals.

.

DTC SET CONDITIONS

Check Conditions

• None.

Judgment Criteria

• Oxygen sensor slow response.

• MIL activated after 2 drive cycles.

• No Limp home.

.

EOBD DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− EOBD Drive Cycle −

P.13A-11

.

.

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )

• Right bank heated oxygen sensor deterio-

rated/failed.

• Right bank side catalytic converter deteriorated.

• Exhaust leak.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• Diagnostic tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check for exhaust leak.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 4.
NO : Go to Step 2.

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STEP 2. Using diagnostic tool, check data list item AD:
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

CAUTION

To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the data reading mode for item AD,

Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

• Warming up the engine. When the engine is revved, the

output voltage should repeat 0 volt and 0.6 to 1.0 volt
alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : Go to Step 3.
NO : Replace the right bank, rear oxygen sensor. Then go

to Step 4.

NOTE: When replacing a deteriorated oxygen sensor the vehi-
cle mileage is most likely high and as a result the emission con-
trol system will be deteriorated considerably. Therefore it is
recommended to replace both front and rear oxygen sensors
as a set. Also check that the Catalytic convertor is functioning
correctly.

STEP 3. Using diagnostic tool, check data list item AC:
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
(1) Start the engine and run at idle.
(2) Set diagnostic tool to the data reading mode for item AC,

Heated Oxygen Sensor Bank 1, Sensor 1 (right front).

• Warming up the engine. When the engine is revved, the

output voltage should be 0.6 to 1.0 volt.

(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : Go to Step 4.
NO : Replace the right bank, front oxygen sensor. Then go

to Step 4.

NOTE: When replacing a deteriorated oxygen sensor the vehi-
cle mileage is most likely high and as a result the emission con-
trol system will be deteriorated considerably. Therefore it is
recommended to replace both front and rear oxygen sensors
as a set. Also check that the Catalytic convertor is functioning
correctly.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-451

STEP 4. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− EOBD Drive Cycle −

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).

Q: Is DTC P2098 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.