What is the Problem if Engine Hard to Start in Morning

What is the Problem if Engine Hard to Start in Morning.?
How to check of this problem?

Model: Hyundai Sonata (FL).

Year Model: 2010

Fuel: Gasoline

Displacement: 2400cc

Subject: Engine Hard starting especially in the morning.

1) Condition

1. Engine hard starting in morning, at the same time after driving the car and park after a few minute try to start it cannot start immediately.

2) Cause

1. immobilizer key.

3) Diagnosis

1. Scan tool check
   Trouble Code.
   a) P1693 – Immobilizer Transponder.
   
   Almost all Hyundai model are built in with anti theft gadget that what we call immobilizer system. consist of ECM, the SMARTRA3 and the ignition keys with built in transponder.
      The ECM carries out the check of ignition key by especial encryption algorithm with SMARTRA3 and transponder. the encryption algorithm (between ECM and SMARTRA3) is used one offered from Bosch. the encryption algorithm (between ECM and Transponder) is Hitag2 type witch is high level.when ignition ON, the ECM executes the key authentication. The engine can be started in case of the success in SMARTRA3 and key Authentication.
      The Key teaching procedure start with ECM request of pin from scanner. The ‘virgin’ ECM stores the pin and the key learning can be started. the '”learnt” ECM compares the PIN from tester with the vehicle password in transponder. If the data is correct, the learning can be started. Scanner request the learning of the first key, the SMARTRA3 is registered at first and then first key is registered by ECM. If the SMARTRA3 status is learnt and pin number is different , the SMARTRA3 will return the incorrect pin data to the ECM. in this case, the ECM can’t execute the key learning process.
2. Observation the key indicator from control takes a second to appear this abnormal. the normal is takes 3 second only.
3. Check and reprogram with new key.
4. The indicator normalize = Ok

4) Replace Parts

• Immobilizer Key

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