Mitsubishi Outlander (2013+). Manual — part 307
TROUBLESHOOTING
MULTIPOINT FUEL INJECTION (MPI)
13A-109
Judgement Criterion
• Voltage obtained with the formula given below is
more than 0.4 V: accelerator pedal position sen-
sor (main) voltage
− accelerator pedal position
sensor (sub) voltage
NOTE: The accelerator pedal position sensor volt-
age used for the judgment is converted into the
accelerator pedal position sensor voltage for the
internal processing by the engine-ECU.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if accelerator pedal position sensor (sub)
fails.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Harness damage in accelerator pedal position
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU APSE
line and body earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 2.
STEP 2. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSE.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
STEP 4. Perform resistance measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU EV
line and body earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal EV.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal 5VV.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSM.
• Check output line for damage.
Q: Is the check result normal?
TROUBLESHOOTING
MULTIPOINT FUEL INJECTION (MPI)
13A-110
YES :
Go to Step 9.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 9. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSS.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 10. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU.
NO :
Check end.
Code No. P2228: Barometric Pressure Sensor Circuit Low Input
FUNCTION
• The barometric pressure sensor converts the bar-
ometric pressure into a voltage signal and inputs
the signal to the engine-ECU.
• In response to the signal, the engine-ECU cor-
rects the fuel injection amount, etc.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• Battery positive voltage is more than 8 V.
Judgement Criterion
• Barometric pressure sensor output signal is less
than 49 kPa (approximately 4,600m above sea
level) for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the barometric pressure is 101 kPa.
PROBABLE CAUSE
• Failed barometric pressure sensor
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Code No. P2229: Barometric Pressure Sensor Circuit High Input
FUNCTION
• The barometric pressure sensor converts the bar-
ometric pressure into a voltage signal and inputs
the signal to the engine-ECU.
• In response to the signal, the engine-ECU cor-
rects the fuel injection amount, etc.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• Battery positive voltage is more than 8 V.
Judgement Criterion
• Barometric pressure sensor output signal is more
than 113 kPa (approximately 1,200 m below sea
level) for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the barometric pressure is 101 kPa.
PROBABLE CAUSE
• Failed barometric pressure sensor
TROUBLESHOOTING
MULTIPOINT FUEL INJECTION (MPI)
13A-111
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Code No. P2252: Oxygen Sensor Offset Circuit Low Voltage
OPERATION
• Check code No. P0131: oxygen sensor (front) cir-
cuit low voltage (Refer to
• Check code No. P0137: oxygen sensor (rear) cir-
cuit low voltage (Refer to
FUNCTION
• The engine-ECU watches and checks whether
the offset voltage of the oxygen sensor is normal
or not.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Oxygen sensor offset voltage is less than 0.4 V
for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Failed oxygen sensor (rear)
• Short circuit in oxygen sensor (front) circuit or
loose connector contact
• Short circuit in oxygen sensor (rear) circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check oxygen sensor (front) itself.
• Oxygen sensor (front) connector check.
• Oxygen sensor check (Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair or replace the connector, or replace
the oxygen sensor.
STEP 2. Check oxygen sensor (rear) itself.
• Oxygen sensor (rear) connector check.
• Oxygen sensor check (Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair or replace the connector, or replace
the oxygen sensor (rear).
STEP 3. Perform voltage measurement at oxygen
sensor (front) connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspec-
tion.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU OFLE line
and body earth.
OK: 0.4
− 0.6 V
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 4.
STEP 4. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
TROUBLESHOOTING
MULTIPOINT FUEL INJECTION (MPI)
13A-112
STEP 6. Perform voltage measurement at oxygen
sensor (rear) connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspec-
tion.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU ORLE line
and body earth.
OK: 0.4
− 0.6 V
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 7.
STEP 7. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal ORLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
Code No. P2253: Oxygen Sensor Offset Circuit High Voltage
OPERATION
• Check code No. P0131: oxygen sensor (front) cir-
cuit low voltage (Refer to
• Check code No. P0137: oxygen sensor (rear) cir-
cuit low voltage (Refer to
FUNCTION
• The engine-ECU watches and checks whether
the offset voltage of the oxygen sensor is normal
or not.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Oxygen sensor offset voltage is more than 0.6 V
for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Does not control air-fuel ratio closed loop.
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Failed oxygen sensor (rear)
• Short circuit in oxygen sensor (front) circuit or
loose connector contact
• Short circuit in oxygen sensor (rear) circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check oxygen sensor (front) itself.
• Oxygen sensor (front) connector check.
• Oxygen sensor check (Refer to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair or replace the connector, or replace
the oxygen sensor (front).
STEP 2. Check oxygen sensor (rear) itself.
• Oxygen sensor (rear) connector check.
• Oxygen sensor check (Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair or replace the connector, or replace
the oxygen sensor (rear).
STEP 3. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspec-
tion.
• Ignition switch: "ON"
• Voltage between terminal OFLE and body earth.
OK: 0.4
− 0.6 V
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 4.
STEP 4. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair or replace the connector, or repair
the damaged harness wire.
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