Mitsubishi 380. Manual — part 493
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-64
• 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 left bank heated oxygen sensor
(rear) heater circuit, harness damage, or connec-
tor damage.
• Left bank heated oxygen sensor (rear) heater
failed.
• 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-24 at the left bank
heated oxygen sensor (rear) 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.
1
2
3
4
AK303079
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-65
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect left bank heated oxygen sensor (rear) connector
B-24.
(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 left bank heated oxygen sensor (rear).
Then go to Step 11.
1
2
3
4
AK303079
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-66
STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (rear) harness side connector B-24.
(1) Disconnect the connector B-24 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 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.
1
2
3
4
AK303079
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
03DB229A
B-25 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-67
STEP 4. Check harness connector B-17X at the MPI relay
for damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MPI relay connector
B-17X (terminal No. 4) and left bank heated oxygen
sensor (rear) connector B-24 (terminal No. 4)
because of open circuit or short circuit to ground.
Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
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