Mitsubishi 380. Manual — part 539
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-248
STEP 4. Check for short circuit to ground between left
bank heated oxygen sensor (rear) connector B-24
(terminal No. 1) and ENGINE-ECU connector B-20 (terminal
No. 30).
Q: Is the harness wire in good condition?
YES : Then go to Step 5.
NO : Repair or replace it. Then go to Step 6.
1
2
3
4
AK303079
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-249
STEP 5. Using diagnostic tool, check data list item AF:
Heated Oxygen Sensor Bank 2, Sensor 2 (left 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 itemAF,
Heated Oxygen Sensor Bank 2, Sensor 2 (left 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.
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 : Replace the 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 P0157 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-250
DTC P0158: Heated Oxygen Sensor Circuit High Voltage (bank 2, sensor 2).
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the
ENGINE-ECU (terminal No. 30) from the output
terminal (terminal No. 1) of the left bank heated
oxygen sensor (rear).
• Terminal No. 2 of the left bank heated oxygen
sensor (rear) is grounded with ENGINE-ECU (ter-
minal No. 29).
.
TECHNICAL DESCRIPTION
• The output signal of the left bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the left bank heated oxygen sensor (rear).
• The ENGINE-ECU checks for an open circuit in
the left bank heated oxygen sensor (rear) output
line.
.
DTC SET CONDITIONS
Check Conditions
• Battery voltage is between 10.7 and 16.1volts.
• Engine speed is above 20 r/min.
• Engine start achieved.
Judgment Criteria
• Signal check.
• MIL is activated after 2 Drive cycles.
• No limp home.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
Procedure 6
− Other Monitor
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Short circuit t battery voltage in left bank heated
oxygen sensor (rear) output line.
• Wiring harness or connector damage.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
AK303079
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI)
13A-251
DIAGNOSIS
Required Special Tools:
• : Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using diagnostic tool, check data list item AF:
Heated Oxygen Sensor Bank 2, Sensor 2 (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 itemAF,
Heated Oxygen Sensor Bank 2, Sensor 2 (left 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.
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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