DTC P050A

Cold start idle air control system performance

DETECTION CONDITION

• Actual Idle speed is lower than expected by 100 rpm for 8.4 s when the target idle speed correction value for cold start is above 0 rpm or ignition retard value is above 10 ° CA.

NOTE:

• If atmospheric pressure is less than 72.3 kPa {542 mmHg, 21.3 inHg} or intake air temperature is below -10 °C {14 °F}, the PCM cancels diagnosis of P050A.

Diagnostic support note

• This is an intermittent monitor (Cold start reduction strategy monitoring).

• MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA is available.

• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Electronic throttle control system malfunction

• Throttle valve stuck or blockage

• Air suction in intake air system

• PCM malfunction

STEP

INSPECTION

ACTION

1

• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (CCM related) been recorded?

Yes

Go to the next step.

No

Record the freeze frame data and diagnostic monitoring test results on the repair order, then go to the next step.

2

• 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.

3

• Is P050A on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to troubleshooting procedures for DTC on freeze frame data.

(See DTC TABLE[LF].)

4

• Start the engine.

• Check air suction between MAF sensor and intake manifold.

• Is there any air suction in the intake air system?

Yes

Repair or replace malfunctioning part, then go to Step 7.

No

Go to the next step.

5

• Perform the Electronic Throttle Control System Operation Inspection.

  (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF].)

• Does the electronic throttle control system operate properly?

Yes

Go to the next step.

No

Repair or replace malfunctioning part according to inspection result.

Then go to Step 7.

6

• Turn the ignition switch to off.

• Remove the throttle valve with connector connected.

• Access ETC_DSD PID using the M-MDS.

• Turn the ignition switch to the ON position (Engine off).

• Move the throttle valve using the ETC_DSD PID simulation function.

• Dose the throttle valve move smoothly?

Yes

Go to the next step.

No

Clean the throttle valve and retest.

If the problem does not resolve, replace the throttle body.

Then go to the next step.

7

• Make sure to reconnect all disconnected connectors.

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

• Perform the KOER self-test using the M-MDS.

  (See DTC TABLE[LF].)

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION[LF].)

No

Go to the next step.

8

• Perform the “after repair procedure”.

  (See AFTER REPAIR PROCEDURE[LF].)

• Are any DTC present?

Yes

Go to the applicable DTC troubleshooting.

(See DTC TABLE[LF].)

No

Troubleshooting completed.