Mitsubishi Outlander (2013+). Manual - part 287

 

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Mitsubishi Outlander (2013+). Manual - part 287

 

 

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-29

STEP 2. Perform voltage measurement at oxygen 
sensor (front) connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal power supply line and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector, or check 

and repair harness between oxygen sensor 
(front) connector terminal and engine 
control relay connector terminal.

• Check power supply line for 

open/short circuit.

STEP 3. Perform voltage measurement at 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal OHFL and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector, or check 

intermediate connector, and repair if 
necessary. If intermediate connector is 
normal, check and repair harness between 
oxygen sensor (front) connector terminal 
and engine-ECU connector terminal OHFL.

• Check earthing line for open/short 

circuit.

STEP 4. Check harness between oxygen sensor 
(front) connector terminal and engine-ECU 
connector terminal OHFL.

• Check earthing line for damage.

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. Check harness between oxygen sensor 
(front) connector terminal and engine control 
relay connector terminal.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 6. 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 
).

Code No. P0032: Oxygen Sensor (front) Heater Circuit High Input

OPERATION

• Power is supplied to the heater power terminal of 

the oxygen sensor (front) connector from the 
engine control relay connector terminal.

• The heater of the oxygen sensor (front) connec-

tor terminal is controlled by the power transistor 
in the engine-ECU connector terminal OHFL.

FUNCTION

• The power supply to the oxygen sensor (front) 

heater is controlled by the ON/OFF control of the 
power transistor in the engine-ECU.

• Heating the oxygen sensor (front) heater enables 

the oxygen sensor (front) to provide good 
response even when the exhaust emission tem-
perature is low.

TROUBLE JUDGMENT

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• While the oxygen sensor (front) heater is on.

• Battery positive voltage is more than 11 V and is 

less than 16.5 V.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-30

Judgement Criterion

• The oxygen sensor (front) heater current is more 

than 10.5 A for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed oxygen sensor (front) heater

• Short circuit in oxygen sensor (front) heater cir-

cuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Perform resistance measurement at 
oxygen sensor (front) connector.

• Disconnect connector, and measure at sensor 

side.

• Resistance between terminal power supply line 

and engine-ECU OHFL line.

OK: 4.5 

 8.0  (at 20°C)

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 harness between engine control 
relay connector terminal and oxygen sensor 
(front) connector terminal.

• Check power supply line for short circuit.

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. Check harness between oxygen sensor 
(front) connector terminal and engine-ECU 
connector terminal OHFL.

• Check earthing line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 4. 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 
).

Code No. P0037: Oxygen Sensor (rear) Heater Circuit Low Input 

OPERATION

• Power is supplied to the heater power connector 

terminal of the oxygen sensor (rear) connector 
from the engine control relay connector terminal.

• The heater of the oxygen sensor (rear) connector 

terminal is controlled by the power transistor in 
the engine-ECU connector terminal OHRL.

FUNCTION

• The power supply to the oxygen sensor (rear) 

heater is controlled by the ON/OFF control of the 
power transistor in the engine-ECU.

• Heating the oxygen sensor (rear) heater enables 

the oxygen sensor (rear) to provide good 
response even when the exhaust emission tem-
perature is low.

TROUBLE JUDGMENT

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• While the oxygen sensor (rear) heater is on.

• Battery positive voltage is more than 11 V and is 

less than 16.5 V.

Judgement Criterion

• The oxygen sensor (rear) heater current is less 

than 0.17 A for 2 seconds.

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• While the oxygen sensor (rear) heater is off.

• Battery positive voltage is more than 11 V and is 

less than 16.5 V.

Judgement Criterion

• The oxygen sensor (rear) heater voltage is less 

than 2.0 V for 2 seconds.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-31

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed oxygen sensor (rear) heater

• Open/short circuit or harness damage in oxygen 

sensor (rear) heater circuit or loose connector 
contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Perform resistance measurement at 
oxygen sensor (rear) connector.

• Disconnect connector, and measure at sensor 

side.

• Resistance between terminals.

OK: 4.5 

 8.0  (at 20°C)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair or replace the connector, or replace 
the oxygen sensor (rear).

STEP 2. Perform voltage measurement at oxygen 
sensor (rear) connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal power supply line and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector, or check 

intermediate connector, and repair if 
necessary. If intermediate connector is 
normal, check and repair harness between 
oxygen sensor (rear) connector terminal 
and engine control relay connector terminal.

• Check power supply line for 

open/short circuit.

STEP 3. Perform voltage measurement at 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal OHRL and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector, or check 

intermediate connectors, and repair if 
necessary. If intermediate connectors are 
normal, check and repair harness between 
oxygen sensor (rear) connector terminal 
and engine-ECU connector terminal OHRL. 

• Check earthing line for open/short 

circuit.

STEP 4. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal OHRL.

• Check earthing line for damage.

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. Check harness between oxygen sensor 
(rear) connector terminal and engine control 
relay connector terminal.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 6. 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 
).

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-32

Code No. P0038: Oxygen Sensor (rear) Heater Circuit High Input

OPERATION

• Power is supplied to the heater power connector 

terminal of the oxygen sensor (rear) connector 
from the engine control relay connector terminal.

• The heater the oxygen sensor (rear) connector 

terminal is controlled by the power transistor in 
the engine-ECU connector terminal OHRL.

FUNCTION

• The power supply to the oxygen sensor (rear) 

heater is controlled by the ON/OFF control of the 
power transistor in the engine-ECU.

• Heating the oxygen sensor (rear) heater enables 

the oxygen sensor (rear) to provide good 
response even when the exhaust emission tem-
perature is low.

TROUBLE JUDGMENT

Check Conditions

• More than 2 seconds have passed since the 

engine starting sequence was completed.

• While the oxygen sensor (rear) heater is on.

• Battery positive voltage is more than 11 V and is 

less than 16.5 V.

Judgement Criterion

• The oxygen sensor (rear) heater current is more 

than 10.5 A for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed oxygen sensor (rear) heater

• Short circuit in oxygen sensor (rear) heater circuit 

or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Perform resistance measurement at 
oxygen sensor (rear) connector.

• Disconnect connector, and measure at sensor 

side.

• Resistance between terminals.

OK: 4.5 

 8.0  (at 20°C)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair or replace the connector, or replace 
the oxygen sensor (rear).

STEP 2. Check harness between engine control 
relay connector terminal and oxygen sensor 
(rear) connector terminal.

• Check power supply line for short circuit.

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. Check harness between oxygen sensor 
(rear) connector terminal and engine-ECU 
connector terminal OHRL.

• Check earthing line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the connector, or repair 
the damaged harness wire.

STEP 4. 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 
).

Code No. P0068: Trustful Check Air Flow Sensor

FUNCTION

• Compare the actual measurement of volumetric 

efficiency by an air flow sensor signal with volu-

metric efficiency estimated from a throttle position 
sensor (main and sub) signal.

 

 

 

 

 

 

 

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