Mitsubishi 380. Manual — part 530
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-212
DTC P0150: Heated Oxygen Sensor Circuit (bank 2, sensor 1).
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the
ENGINE-ECU (terminal No. 15) from the output
terminal (terminal No. 1) of the left bank heated
oxygen sensor (front).
• Terminal No. 2 of the left bank heated oxygen
sensor (front) is grounded with or ENGINE-ECU
(terminal No. 14).
.
TECHNICAL DESCRIPTION
• The left bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts that data to voltage, and
sends it to the ENGINE-ECU.
• When the left bank heated oxygen sensor (front)
begins to deteriorate, the heated oxygen sensor
signal response deteriorates also.
• The ENGINE-ECU forcibly varies the air/fuel mix-
ture to make it leaner and richer, and checks the
response speed of the left bank heated oxygen
sensor (front). In addition, the ENGINE-ECU also
checks for an open circuit in the left 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.
Judgment Criteria
• 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: )
• Left bank heated oxygen sensor (front) failed.
• Short circuit in left bank heated oxygen sensor
(front) output line to heater circuit ground line.
• Wiring harness or connector damage.
• 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.
AK303070
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-213
• MB991827: USB Cable
• MB991910: Main Harness A
• MB992044: ENGINE-ECU Check Harness
STEP 1. Using diagnostic tool, check data list item AE:
Heated Oxygen Sensor Bank 2, Sensor 1 (left 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 AE,
Heated Oxygen Sensor Bank 2, Sensor 1 (left 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
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-214
STEP 2. Measure the sensor output voltage at
ENGINE-ECU connector B-20 by using ENGINE-ECU
check harness special tool MB992044.
(1) Disconnect the ENGINE-ECU connectors and connect
ENGINE-ECU check harness special tool MB992044
between the separated connectors.
(2) Start the engine and run at idle.
(3) Ensure engine is at running temperature (80
° C or higher).
(4) Measure the voltage between terminal No. 15 and ground.
• Warm engine. When the engine is 2,500 r/min, the out-
put voltage should cycle between 0.1 to 0.8-1.0 volt
alternately.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage cycling within the specified
range?
YES : Go to Step 6.
NO : Go to Step 3.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB208A
B-20 HARNESS
CONNECTOR
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-215
STEP 3. Check harness connector B-25 at left bank heated
oxygen sensor (front) and harness connector B-20 at
ENGINE-ECU for damage or loose terminals.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 6.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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