Mitsubishi Outlander (2013+). Manual - part 304

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-97

YES : 

Go to Step 2.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 
).

STEP 2. M.U.T.-III diagnosis code

• Confirm the diagnosis code is set from the 

ASC-ECU.

Q: Is diagnosis code set?

YES : 

Perform troubleshooting of the active 

stability control system (ASC) (Refer to 
GROUP 35C 

− Troubleshooting − Diagnosis 

Code Chart ).

NO : 

Replace the engine-ECU.

Code No. P1238: Air Flow Sensor Trustful For Torque Monitoring

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.

TROUBLE JUDGMENT

Check Conditions

• Difference between the actual volumetric effi-

ciency and the volumetric efficiency estimated by 
the throttle position sensor (main) is more than 0 
%. Or, the volumetric efficiency is less than 60 %.

• Engine speed is more than 750 r/min.

Judgement Criterion

• Difference between the actual volumetric effi-

ciency and the volumetric efficiency estimated by 
the throttle position sensor (main) is more than 35 
%.

Check Conditions

• Difference between the actual volumetric effi-

ciency and the volumetric efficiency estimated by 
the throttle position sensor (sub) is more than 0 
%. Or, the volumetric efficiency is less than 60 %.

• Engine speed is more than 750 r/min.

Judgement Criterion

• Difference between the actual volumetric effi-

ciency and the volumetric efficiency estimated by 
the throttle position sensor (sub) is more than 35 
%.

FAIL-SAFE AND BACKUP FUNCTION

• Throttle opening degree position is in default 

position.

PROBABLE CAUSES

• Failed air flow sensor

• Harness damage in air flow sensor circuit or 

loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is any other diagnosis code than P1238 set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-23

).

NO : 

Go to Step 2.

STEP 2. M.U.T.-III data list

• Data list reference table (Refer to 

P.13A-155

).

a. Item 10: Air flow sensor

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Check air flow sensor system. Check code 
No. P0102: air flow sensor circuit low input 
(Refer to 

P.13A-33

. Check code No. P0103: 

air flow sensor circuit high input (Refer to 

P.13A-35

).

Code No. P1240: Trustful Check Ignition Angle <Vehicles with ASC>

FUNCTION

• Checks for an abnormal ignition timing retard 

angle demand signal from the active stability con-
trol (ASC).

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-98

Judgment Criterion

• Ignition timing retard angle demand signal is 

abnormal.

FAIL-SAFE AND BACKUP FUNCTION

• Ignition retard is not carried out.

PROBABLE CAUSES

• Failed active stability control system

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is diagnosis code related to CAN communication 

set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-23

).

NO : 

Go to Step 2.

STEP 2. M.U.T.-III diagnosis code

• Confirm the diagnosis code is set from the 

ASC-ECU.

Q: Is diagnosis code set?

YES : 

Perform troubleshooting of the active 

stability control system (ASC) (Refer to 
GROUP 35C 

− Troubleshooting − Diagnosis 

Code Chart ).

NO : 

Replace the engine-ECU.

Code No. P1242: Fail-safe Control Monitoring

FUNCTION

• Monitors the engine speed during fail-safe con-

trol.

TROUBLE JUDGMENT

Check Condition

• During fail safe control.

Judgement Criterion

• Engine speed is more than assumed.

FAIL-SAFE AND BACKUP FUNCTION

• Throttle opening degree position is default posi-

tion.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is any other diagnosis code than P1242 set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-23

).

NO : 

Go to Step 2.

STEP 2. 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. P1243: Inquiry/Response Error

FUNCTION

• Monitors the computation function of the 

engine-ECU.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• Engine-ECU can not calculate input data.

FAIL-SAFE AND BACKUP FUNCTION

• Microcomputer is reset.

PROBABLE CAUSE

• Failed engine-ECU

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-99

DIAGNOSIS PROCEDURE

STEP 1. 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. P1247: Trustful Check CVT

FUNCTION

• Checks for an abnormal signal of CVT.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• A torque demand signal from CVT-ECU is abnor-

mal.

FAIL-SAFE AND BACKUP FUNCTION

• Torque requested by CVT-ECU is ignored.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• Confirm the diagnosis code is set from the 

CVT-ECU.

Q: Is diagnosis code set?

YES : 

Perform troubleshooting of CVT system 

(Refer to GROUP 23A 

− Diagnosis Code 

Chart ).

NO : 

Go to Step 2.

STEP 2. 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. P1590: CVT-ECU to Engine-ECU Communication Error in Torque Reduction Request

FUNCTION

• The engine-ECU monitors and checks communi-

cation with the CVT-ECU.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

Judgement Criterion

• Engine-ECU detects an error in communication 

between engine-ECU and CVT-ECU.

FAIL-SAFE AND BACKUP FUNCTION

• Engine output is restricted.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is diagnosis code of U0101 set?

YES : 

Perform troubleshooting of CVT-ECU 

time-out. Check code No. U0101 CVT-ECU 
time-out (Refer to 

P.13A-114

).

NO : 

Go to Step 2.

STEP 2. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is diagnosis code set?

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-100

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. P1603: Battery Backup Circuit Malfunction

OPERATION

• Power is directly supplied to the engine-ECU 

connector terminal BACK from the battery.

FUNCTION

• The engine-ECU checks open circuit in the bat-

tery backup line.

TROUBLE JUDGMENT

Check Conditions

• Engine starting sequence was completed.

• Battery positive voltage is more than 10 V.

Judgment Criterion

• Battery backup line voltage is less than 6 V for 2 

seconds.

FAIL-SAFE AND BACKUP FUNCTION

• All diagnosis codes are stored once failure judg-

ment is completed.

PROBABLE CAUSES

• Open/short circuit or harness damage in battery 

backup line circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• Temporarily place the ignition switch in LOCK 

(OFF) position, and 10 seconds after that, place it 
in ON position again.

Q: Is the diagnosis code of P1603 set?

YES : 

Go to Step 2.

NO : 

Check end.

STEP 2. Perform voltage measurement at 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Voltage between terminal BACK 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 the battery and 
engine-ECU connector terminal BACK.

• Check power supply line for 

open/short circuit.

STEP 3. Check harness between the battery and 
engine-ECU connector terminal BACK.

• Check power supply line for damage.

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. P2100: Throttle Valve Control Servo Circuit (open)

OPERATION

• Controls the current that is applied from the 

engine-ECU connector terminals ETV+, ETV- to 

the electronic-controlled throttle valve connector 
terminals.