Checking for increased idle speed when the air conditioner is turned on (Hyundai Sonata EF)

1. Before starting the inspection procedure, prepare the vehicle (see section "Checking the idle speed").

2. Check that the idle speed is within the specified value (see the section "Checking the idle speed").

3. Set the air conditioner switch to the "ON" position (A/C ON), the heater electric fan switch to the "MH" or "HI" position. Make sure that the idle speed corresponds to the nominal value with the air conditioner running.

Nominal value:

2.4L Engine:

"A/C OFF" — 700±100 rpm
"A/C ON" — 850±100 rpm

2.7L Engine:

"A/C OFF" — 700±100 rpm
"A/C ON" — 870±100 rpm

Note: The value of the increased idle speed is set by the engine management system depending on the signal from the air conditioning electronic control unit.

The article is borrowed from an online resource: HyundaiBook.ru

4. If the increased idle speed value does not correspond to the nominal value, check the components of the fuel injection system (see the relevant section of the chapter "Fuel injection system (MFI)").

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This article has been reviewed by: Konstantin Smirnov

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Sonata 4: Maintenance

Checking the idle speed
Checking high voltage wires
Checking and cleaning spark plugs
Rechargeable battery
Checking the air filter

Checking the ignition timing angle
Compression check
Checking and adjusting drive belts of attachments
Checking the condition of the timing belts and balance mechanism (2.0L / 2.4L engines)
Replacing the fuel filter

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