DESCRIPTION

Cold start IAC system performance problem

DETECTION CONDITION

Determination conditions

• The difference between the actual engine speed and the target engine speed is 100 rpm or more.

Preconditions

• Engine speed: 500 rpm or more^*1

• Engine coolant temperature: 0—45 °C {32—113 °F}^*1

• Catalytic converter estimated temperature: 380 °C {716 °F} or less^*1

• Vehicle speed: 0 km/h {0 mph}^*1

• The following DTCs are not detected:

• ECT sensor No.1 malfunction: P0116:00, P0117:00, P0118:00

• MAP sensor malfunction: P0069:00, P0107:00, P0108:00

• BARO sensor malfunction: P2228:00, P2229:00

• Instrument cluster malfunction: P2610:00

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

Malfunction determination period

• 9 s period

Drive cycle

• 2

Self test type

• CMDTC self test

Sensor used

• CKP sensor

• ECT sensor No.1

FAIL-SAFE FUNCTION

• Limits intake air amount

• Stops high pressure fuel pump control

VEHICLE STATUS WHEN DTCs ARE OUTPUT

• Illuminates check engine light.

POSSIBLE CAUSE

• Air suction in intake air system

• Drive-by-wire control system malfunction

• Throttle valve malfunction

• PCM malfunction

Item

Definition

Unit

Condition/Specification

ETC_ACT

Actual throttle valve opening angle

°(deg)

Ignition switched ON (engine off)

• Accelerator pedal released: Approx. 12.94 °

• Accelerator pedal fully depressed: Approx. 86.18 °

Idle (after warm up)

• Accelerator pedal released: Approx. 2.22 °

STEP

INSPECTION

RESULTS

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

• Perform the Freeze Frame PID Data Access Procedure.

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

• Is the DTC P050A:00 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA.

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

3

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.

4

• Switch the ignition off, then ON (engine off).

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

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

• Are any other PENDING CODEs and/or DTCs present?

Yes

Go to the applicable PENDING CODE or DTC inspection.

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

Go to the next step.

No

Go to the next step.

5

• Switch the ignition ON (engine off).

• Access the ETC_ACT PID using the M-MDS.

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

• While gradually depressing the accelerator pedal, verify that PID monitor ETC_ACT value increases.

• Does the monitor value change according to the amount the accelerator pedal is depressed?

Yes

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

No

Go to the troubleshooting procedure to perform the procedure from Step 2.

STEP

INSPECTION

RESULTS

ACTION

1

• Inspect the following parts of the intake air system for looseness, damage, and loss.

• Between air cleaner and throttle body

• Between throttle body and intake manifold

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 3.

No

Go to the next step.

2

• Inspect the throttle valve.

  (See THROTTLE BODY INSPECTION [SKYACTIV-G 2.0].)

• Perform the Electronic Control Throttle Operation Inspection.

  (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the throttle body, then go to the next step.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Clean the throttle valve, then go to the next step.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

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)].)

• Implement the repeatability verification procedure.

  (See Repeatability Verification Procedure.)

• Perform the Pending Trouble Code Access Procedure.

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

• Is the PENDING CODE for this 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

• Is any other DTC or pending code stored?

Yes

Go to the applicable DTC inspection.

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

No

DTC troubleshooting completed.