Mitsubishi Outlander (2013+). Manual - part 300

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-81

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Perform voltage measurement at inlet 
camshaft position sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal engine-ECU 5V line 

and body earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 2.

STEP 2. Check harness between inlet camshaft 
position sensor connector terminal and 
engine-ECU connector terminal 5V.

• Check power supply line for open/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. 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 
).

STEP 4. Perform voltage measurement at inlet 
camshaft position sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal engine-ECU CPI line 

and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. Check harness between inlet camshaft 
position sensor connector terminal and 
engine-ECU connector terminal CPI.

• Check output line for open/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 6. Perform resistance measurement at inlet 
camshaft position sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal engine-ECU CPIE 

line and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Check harness between inlet camshaft 
position sensor connector terminal and 
engine-ECU connector terminal CPIE.

• Check earthing line for open circuit and 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 8. Perform output wave pattern 
measurement at inlet camshaft position sensor 
connector (Using an oscilloscope).

• Use special tool test harness (MB991709) to con-

nect connector, and measure at pick-up harness.

• Engine: Idling

• Transmission: P range

• Voltage between terminal engine-ECU 5V line 

and body earth.

OK: Waveforms should be displayed on 
inspection procedure using an oscilloscope 
(Refer to 

P.13A-174

), its maximum value 

should be 4.8 V or more, and its minimum 
value should be 0.6 V or less. There must be 
no noise in the output wave pattern.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 9.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-82

STEP 9. Check harness between inlet camshaft 
position sensor connector terminal and 
engine-ECU connector terminal 5V.

• Check power supply 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. Check harness between inlet camshaft 
position sensor connector terminal and 
engine-ECU connector terminal CPI.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the damaged harness wire.

STEP 11. Check intake camshaft sensing 
position.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Replace the intake camshaft.

STEP 12. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace the inlet camshaft position sensor.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

Code No. P0421: Catalyst Malfunction

FUNCTION

• The signal from the oxygen sensor (rear) differs 

from the oxygen sensor (front). That is because 
the catalytic converter purifies exhaust gas. 
When the catalytic converter has deteriorated, 
the signal from the oxygen sensor (front) 
becomes similar to the oxygen sensor (rear).

• The engine-ECU compares the output of the front 

and rear oxygen sensor signals.

TROUBLE JUDGMENT

Check Conditions

• Engine speed is less than 3,000 r/min.

• Accelerator pedal is open.

• Air flow sensor output is more than 5 g/sec and is 

less than 50 g/sec. <4B11>

• Air flow sensor output is more than 6.4 g/sec and 

is less than 65 g/sec. <4B12>

• More than 3 seconds have elapsed after the 

above mentioned three conditions have been 
met.

• Intake air temperature is more than −10°C.

• Barometric pressure is more than 76 kPa.

• Under the closed loop air/fuel ratio control.

• Vehicle speed is more than 1.5 km/h.

• The engine-ECU monitors for this condition for 5 

cycles of 10 seconds each during the drive cycle.

• Short-term fuel trim is more than −25 % and is 

less than +25 %.

• The cumulative air flow is more than 3,700 g. 

<4B11>

• The cumulative air flow is more than 2,834 g. 

<4B12>

Judgement Criterion

• When the monitoring for 10 seconds is carried 

out 5 times, the frequency ratio of oxygen sensor 
(rear) and oxygen sensor (front) is more than 
0.85.

NOTE: The specified value varies depending on the 
average air flow rate.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Catalytic converter deteriorated

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Replace the catalytic converter.

• After replacing the catalytic converter, reconfirm 

whether the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the engine-ECU.

NO : 

Check end.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-83

Code No. P0458: Purge Control Solenoid Valve Circuit Low Input

OPERATION

• Power is supplied to the purge control solenoid 

valve connector terminal from the engine control 
relay connector terminal.

• The engine-ECU connector terminal PURG 

makes the power transistor in the unit be in ON 
position, and that makes currents go on the purge 
control solenoid valve connector terminal.

FUNCTION

• In response to a signal from the engine-ECU, the 

purge control solenoid valve controls the flow rate 
of the purge air to be introduced into the inlet 
manifold.

TROUBLE JUDGMENT

Check Conditions

• Engine is being cranked.

• Battery positive voltage is more than 10 V and is 

less than 16.5 V.

Judgement Criteria

• The solenoid voltage is more than 3 V with the 

purge control solenoid driving.

• The engine-ECU monitors this condition once 

during the drive cycle.

Check Conditions

• Battery positive voltage is more than 10 V and is 

less than 16.5 V.

Judgement Criterion

• The solenoid voltage is more than 3 V for 2 sec-

onds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed purge control solenoid valve

• Open/short circuit or harness damage in purge 

control solenoid value circuit or loose connector 
contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

• Item 10: Purge control solenoid valve

OK: Operating sound can be heard and the 
valve vibrates

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Go to Step 2.

STEP 2. Perform resistance measurement at 
purge control solenoid valve connector.

• Disconnect connector, and measure at solenoid 

valve side.

• Resistance between terminals.

OK: 22 

− 26 Ω (at 20°C)

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the connector, or replace 
the purge control solenoid valve.

STEP 3. Perform voltage measurement at purge 
control solenoid valve 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 5.

NO : 

Go to Step 4.

STEP 4. Connector check: engine control relay 
connector

Q: Is the check result normal?

YES : 

Check intermediate connector, and repair if 

necessary. If intermediate connector is 
normal, check and repair harness between 
purge control solenoid valve connector 
terminal and engine control relay connector 
terminal power supply line.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace the connector.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-84

STEP 5. Perform voltage measurement at 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal PURG and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair or replace the connector, or check 

and repair harness between purge control 
solenoid valve connector terminal and 
engine-ECU connector terminal PURG.

• Check output line for open/short 

circuit.

STEP 6. Check harness between purge control 
solenoid valve connector terminal and 
engine-ECU connector terminal PURG.

• Check output 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 purge control 
solenoid valve connector terminal and engine 
control relay connector terminal power supply 
line.

• 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. M.U.T.-III actuator test

• Item 10: purge control solenoid valve

OK: Operating sound can be heard and the 
valve vibrates

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

NO : 

Replace the engine-ECU.

Code No. P0459: Purge Control Solenoid Valve Circuit High Input

OPERATION

• Power is supplied to the purge control solenoid 

valve connector terminal from the engine control 
relay connector terminal.

• The engine-ECU connector terminal PURG 

makes the power transistor in the unit be in ON 
position, and that makes currents go on the purge 
control solenoid valve connector terminal.

FUNCTION

• In response to a signal from the engine-ECU, the 

purge control solenoid valve controls the flow rate 
of the purge air to be introduced into the inlet 
manifold.

TROUBLE JUDGMENT

Check Conditions

• Engine is being cranked.

• Battery positive voltage is more than 10 V and is 

less than 16.5 V.

Judgement Criteria

• The solenoid current is more than 2.3 A with the 

purge control solenoid driving.

• The engine-ECU monitors this condition once 

during the drive cycle.

Check Conditions

• Battery positive voltage is more than 10 V and is 

less than 16.5 V.

Judgement Criterion

• The solenoid current is more than 2.3 A for 2 sec-

onds.

FAIL-SAFE AND BACKUP FUNCTION

• None

PROBABLE CAUSES

• Failed purge control solenoid valve

• Short circuit or harness damage in purge control 

solenoid value circuit or loose connector contact

• Failed engine-ECU