Mitsubishi 380. Manual — part 518
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-164
STEP 4. Check for short to heater circuit ground harness
wire between right bank heated oxygen sensor (front)
connector B-09 (terminal No. 1) and ENGINE-ECU
connector B-20 (terminal No. 45).
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Then go to Step 6.
1
2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-165
STEP 5. Using diagnostic tool, check data list item AC:
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
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 item AC,
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
• Warm engine. When the engine is revved up and down,
the output voltage should cycle between 0.1 to 0.8 volt.
• Warm engine. When the engine is idling, the output volt-
age should alternate between 0.1 to 0.6 - 1.0 volt.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
NOTE: If data list readings are low or appear slow to cycle
during check the sensor is likely to be malfuctioning. Ensure
wiring and connector checks are performed prior to replac-
ing sensor.
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 faulty oxygen sensor. Then go to Step 6.
STEP 6. 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 P0130 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-166
DTC P0131: Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 1).
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the
ENGINE-ECU (terminal No. 45) from the output
terminal (terminal No. 1) of the right bank heated
oxygen sensor (front).
• Terminal No. 2 of the right bank heated oxygen
sensor (front) is grounded with ENGINE-ECU
(terminal No. 44).
.
TECHNICAL DESCRIPTION
• The right bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the
ENGINE-ECU.
• When the right bank heated oxygen sensor
(front) begins to deteriorate, the heated oxygen
sensor signal response becomes poor.
• The ENGINE-ECU forcibly varies the air/fuel mix-
ture to make it leaner and richer, and checks the
response speed of the right bank heated oxygen
sensor (front). In addition, the ENGINE-ECU also
checks for an open circuit in the right bank
heated oxygen sensor (front) output line.
.
DTC SET CONDITIONS
Check Conditions
• Battery voltage < 11.02 volts
• Engine coolant temperature is higher than 80°C.
Judgement Criteria
• Internal Resistance of the Nernst - cell is equal or
greater than a modelled resistance based on the
heating output of the O2-sensor and the mod-
elled exhasused gas temperature
• Idling.
• 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 (front) failed.
• Short circuit to ground in right bank heated oxy-
gen sensor (front) output line.
• Wiring harness or connector damage.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
AK303047
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-167
DIAGNOSIS
Required Special Tools:
• Diagnostic tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB992044: ENGINE-ECU Check Harness
STEP 1. Using diagnostic tool, check data list item AC:
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
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 item AC,
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
• Warm engine. When the engine is revved up and down,
the output voltage should cycle between 0.1 to 1.0 volt.
• Warm engine. When the engine is idling, the output volt-
age should alternate between 0.1 to 0.6 -1.0 volt.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
NOTE: If data list readings are consistantly low or appear
slow to cycle( should cycle every 0.5-1.0 sec.) during check
the sensor is likely to be malfuctioning. Ensure wiring and
connector checks are performed prior to replacing sensor.
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 : Go to Step 2.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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