Mitsubishi Motors Service Manual

2018 / ECLIPSE CROSS / EC - Workshop Manual

13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P1310 LOW SPEED PRE-IGNITION DETECTED

Code No. P1310: Low Speed Pre-ignition Detected

FUNCTION

The engine ECU detects abnormal combustion (LSPI) at low engine rotation.
Using engine oil other than genuine goods, oil dilution, or fuel deterioration may cause LSPI. In rare cases, it may occur when intake air temperature is high and high load operation is performed with low rotation.

TROUBLE JUDGEMENT

Check Conditions

After predetermined times since the ignition switch is turned ON or since the completion of engine start.
The engine speed is less than 3,000 r/min.
Volumetric efficiency is more than 160 %.

Judgement Criterion

Detection times of low speed pre-ignition is more than 4 times.

FAIL-SAFE AND BACKUP FUNCTION

Limit the torque that is at low engine speed and high load.

PROBABLE CAUSES

Failed engine oil
Deteriorated fuel
Failed engine
Failed spark plug
Failed turbocharger.

note	If excessive LSPI occurs, the engine, turbocharger, etc. may get damaged.

DIAGNOSIS PROCEDURE

Preparation to carry out troubleshooting

Check with the user whether specified engine oil is used, about the supply source of fuel, fuelling timing, fuelling amount, and car usage status (how long has the car not been used, the driving situation at the time of DTC occurrence, or whether short distance driving in a cold condition occurred).

STEP 1. Check compression pressure.

Check the compression pressure (Refer to GROUP 11A - On-vehicle Service - Compression Pressure Check ).
Check whether there is an abnormality such as abnormal noise or any sticking in the crank shaft rotation during cranking.

Is the check result normal?

Go to Step 2.

Replace the engine assembly.

STEP 2. Check spark plug.

Check spark plug (Refer to GROUP 16 - Ignition System - On-vehicle service - Spark Plug Check and Cleaning ).

Is the check result normal?

Go to Step 3.

Replace the spark plug.

STEP 3. Check turbocharger assembly.

Turbocharger assembly check (Refer to GROUP 15 - Turbocharger Assembly - Turbocharger Assembly Inspection ).

Is the check result normal?

Replace the genuine engine oil. Then go to Step 4.

Replace the turbocharger assembly.

STEP 4. Refill or replace fuel

Check when fuel was refilled and the amount of the fuel, and refill or replace fuel as shown in the table.

Conditions	Remedy
Refilled by a quarter or more of the fuel tank capacity within three months.	No action to be taken.
Refilled within three months, but the fuel amount was less than a quarter of the fuel tank capacity.	Refill it by a quarter or more of the fuel tank capacity with fuel.^*
Not refilled within three months but refilled within six months by one-half or more of the fuel tank capacity.	Refill it by one-half or more of the fuel tank capacity with fuel.^*
Other than the above. Or, fuel properties, refilling timing, or the fuel supply amount is unknown.	Extract fuel in the fuel tank and replace it.

note	^*: Extract fuel so that the specified amount can be replenished.

note	For the details of the fuel tank capacity, refer to the relevant Technical Information Manual (Refer to GROUP 13B - General Information).

Is refilling or replacement of fuel necessary?

Refill or replace the fuel.

Go to Step 5.

STEP 5. M.U.T-IIISE diagnosis code

Reconfirmation of diagnosis code.

Is the diagnosis code set?

Go to Step 1.

Check end.