ENGINE (DIAGNOSTICS)(H4DOTC) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0519 IDLE AIR CONTROL SYSTEM PERFORMANCE

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Engine keeps running at higher speed than specified idle speed.

• Fuel is cut according to fail-safe function.

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

STEPCHECKYESNO

1.CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”.

NOTE:

In this case, it is not necessary to inspect DTC P0519.

2.CHECK AIR INTAKE SYSTEM.

1) Turn the ignition switch to ON.

2) Start and idle the engine.

3) Check the following items.

• Loose installation of intake manifold and throttle body

• Cracks of intake manifold gasket and throttle body gasket

• Disconnection of vacuum hoses

Is there any fault in air intake system?

Repair air suction and leaks.

3.CHECK ELECTRONIC THROTTLE.

1) Turn the ignition switch to OFF.

2) Remove the electronic throttle.

3) Check the electronic throttle.

Are foreign matter found inside electronic throttle?

Remove foreign matter from electronic throttle.

Perform the diagnosis of DTC P2101.