Mitsubishi 380. Manual — part 483
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-24
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC P0031: Heated Oxygen Sensor Heater Circuit low (bank 1, sensor 1).
.
CIRCUIT OPERATION
• Power is supplied from the MPI relay (terminal
No. 4) to the right bank heated oxygen sensor
(front) heater.
• The ENGINE-ECU (terminal No. 47) controls
continuity to the right bank heated oxygen sensor
(front) heater by turning the power transistor in
the ENGINE-ECU "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The ENGINE-ECU checks whether the heater
current is within a specified range when the
heater is energized.
• The ENGINE-ECU checks whether the heater
current is within a specified range when the
heater is not energized.
.
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
AK303047
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-25
DTC SET CONDITIONS
Check Conditions
• Battery voltage is between 10.7 - 16.1 volts.
• Engine starting sequence is completed.
• Engine speed is above 20 r/min.
• Oxygen sensor heater is active.
Judgment Criteria
• The heater voltage is less than 2.4 V during the
calibrated time interval.
or
• The heater voltage is not within 2.4 - 3.6 Volts
during the calibrated time interval.
• MIL is activated after 2 Driving Cycles.
• No limp home mode.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Open or shorted right bank heated oxygen sen-
sor (front) heater circuit, harness damage, or
connector damage.
• Open circuit in right bank heated oxygen sensor
(front) heater.
• 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
• MB992044: ENGINE-ECU Check Harness
STEP 1. Check harness connector B-09 at the right bank
heated oxygen sensor (front) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
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2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-26
STEP 2. Check the right bank heated oxygen sensor
(front).
(1) Disconnect right bank heated oxygen sensor (front)
connector B-09.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 3 and terminal No. 4.
Standard value: 9.0
− 11.0 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 9.0 and 11.0 ohms
[at 20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (front).
Then go to Step 11.
1
2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-27
STEP 3. Measure the power supply voltage at right bank
heated oxygen sensor (front) harness side connector B-09.
(1) Disconnect the connector B-09 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
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2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
03DB200A
B-09 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
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