Mitsubishi 380. Manual — part 527
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-200
STEP 2. Check harness connector B-08 at right bank
heated oxygen sensor (rear) and harness connector B-20
at ENGINE-ECU for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 5.
AK303064
1
2
3
4
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-08
B-08 (GR)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-201
STEP 3. Check for short circuit to power supply between
right bank heated oxygen sensor (rear) connector B-08
(terminal No. 1) and ENGINE-ECU connector B-20 (terminal
No. 60).
Q: Is the harness wire in good condition?
YES : Then go to Step 4.
NO : Repair or replace it. Then go to Step 5.
AK303064
1
2
3
4
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-08
B-08 (GR)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-202
STEP 4. 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) Ensure engine is at running temperature (80
° C or higher).
(4) Set diagnostic tool to the data reading mode for itemAD,
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).
• Warming up the engine. When the engine is revved, the
output voltage should alternate between 0 and 0.6 to 1.0
volts.
(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
− How to
Cope with Intermittent Malfunctions
.
NO : Replace the sensor. Then go to Step 5.
STEP 5. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− EOBD Drive Cycle −
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0138 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-203
DTC P0139: Heated Oxygen Sensor Circuit Slow Response (bank 1, sensor 2).
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the
ENGINE-ECU (terminal No. 60) from the output
terminal (terminal No.1) of the right bank heated
oxygen sensor (rear).
• Terminal No. 2 of the right bank heated oxygen
sensor (rear) is grounded with ENGINE-ECU (ter-
minal No. 59).
.
TECHNICAL DESCRIPTION
• The output signal of the right bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).
• The ENGINE-ECU checks for an open circuit in
the right bank heated oxygen sensor (rear) output
line.
.
DTC SET CONDITIONS
Check Conditions
• Engine speed between 1320 and 3200rpm.
Judgment Criteria
• MIL is activated after 2 Drive cycles.
• No limp home.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Right bank heated oxygen sensor (rear) deterio-
rated.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• : Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
AK303063
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-08
B-08 (GR)
AB
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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