DESCRIPTION

Pre-ignition detected

DETECTION CONDITION

Determination conditions

• Pre-ignition is detected a few times continuously.

Preconditions

• Engine coolant temperature: 80 °C {176 °F} or more^*1

^*1: Value can be verified by displaying the PIDs using the M-MDS.

Malfunction determination period

• Not applicable

Drive cycle

• 1

Self test type

• CMDTC self test, KOER self test

Sensor used

• Ion sensor

FAIL-SAFE FUNCTION

• Not applicable

VEHICLE STATUS WHEN DTCs ARE OUTPUT

• Illuminates the check engine light

POSSIBLE CAUSE

• Fuel having octane rating lower than specified fuel is used

• Carbon accumulated in combustion chamber

• PCM malfunction

Item

Definition

Unit

Condition/Specification

ECT

Engine coolant temperature input from ECT sensor No.1

°C, °F

• Displays ECT

ECT sensor No.1 voltage

V

Ignition switched ON (engine off)

• ECT is 92 °C {198 °F}: Approx. 0.65 V

Idle (after warm up)

• ECT is 93 °C {199 °F}: Approx. 0.64 V

Racing (Engine speed is 2,000 rpm)

• ECT is 92 °C {198 °F}: Approx. 0.66 V

Racing (Engine speed is 4,000 rpm)

• ECT is 93 °C {199 °F}: Approx. 0.64 V

STEP

INSPECTION

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

NOTE:

• Recording can be facilitated using the screen capture function of the PC.

• Record the FREEZE FRAME DATA/snapshot data on the repair order.

—

Go to the next step.

3

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Is a DTC related to a fuel system or variable valve timing system part stored?

Yes

Go to the applicable PENDING CODE or DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

Go to the troubleshooting procedure to perform the procedure from Step 1.

STEP

INSPECTION

ACTION

1

• Switch the ignition off.

• Drain the fuel and add the specified fuel.

  (See FUEL DRAINING PROCEDURE [SKYACTIV-G 2.0].)

—

Go to the next step.

2

• Clear the DTC from the PCM memory using the M-MDS.

  (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)

• Perform the KOER self test.

  (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

NOTE:

• A malfunction has occurred because carbon has accumulated in combustion chamber.

Overhaul the engine and remove the carbon in the combustion chamber.

Go to the next step.

No

Go to Step 4.

3

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)

• Perform the KOER self test.

  (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the next step.

No

Go to the next step.

4

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.