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Smart Key - Smart Key Code Saving Diagnosis: Overview Hyundai Tucson II

Communication Devices ~1135 words

General Description

  1. The secret key code is programmed in memory of Smart Key ECM, PDM, FOB key
  2. The learnt FOB Key identifiers are stored in Smart Key ECM and PDM memory.
  3. Corresponding PIN code is learnt and memorized in the Engine ECM

Communication between smart key ECM and ECM has 2 phase that is IG ON and Engine ON.

After this first IG ON transition phase or starting phase, a communication between Smart Key ECM and Engine ECM takes place.

  1. IG ON Phase (FOB key or Fob Key in Fob holder) Communication between Smart key ECM and ECM starts from wake-up signal from ECM. After receiving wake-up signal from ECM, Smart Key ECM sends lock or unlock starting signal to ECM.
  2. Starting Phase (FOB key or FOB key in Fob Holder) In case driver tries to start engine, although Engine ECM is locked status for starting at IG ON, Engine ECM should send re-authentication to Smart Key ECM. According to the results of re-authentication, it would be decided to start engine or not. The Engine ECM controls the engine, in a normal way for starting and running, and starts communication with the Smart Key ECM, sending a PIN request to the Smart Key ECM and waiting for valid release message from it until the release time period has ended. In case of Smart Key ECM immobilizer function is locked, the Smart Key ECM answer is the no release message. Engine ECM enters in the locked state, which causes the activation of the immobilization actions of the engine. In case of Smart Key ECM immobilizer function state is released, the Smart Key ECM answer is the release message, including the information Smart Key ECM in learnt mode and the PIN code.

DTC Description

This DTC is set, after Engine ECM sends wake-up signal, if response signal from Smart key ECM is abnormal structure or is not valid message during engine ECM communication.

  1. The secret key code is programmed in memory of Smart Key ECM, PDM, FOB key
  2. The learnt FOB Key identifiers are stored in Smart Key ECM and PDM memory.
  3. Corresponding PIN code is learnt and memorized in the Engine ECM

Communication between smart key ECM and ECM, has 2 phase that is IG ON and Engine ON.

After this first IG ON transition phase or starting phase, a communication between Smart Key ECM and Engine ECM takes place.

  1. IG ON Phase (FOB key or Fob Key in Fob holder) Communication between Smart key ECM and ECM starts from wake-up signal from ECM. After receiving wake-up signal from ECM, Smart Key ECM sends lock or unlock starting signal to ECM.
  2. Starting Phase (FOB key or FOB key in Fob Holder) In case driver tries to start engine, although Engine ECM is locked status for starting at IG ON, Engine ECM should send re-authentication to Smart Key ECM. According to the results of re-authentication, it would be decided to start engine or not. The Engine ECM controls the engine, in a normal way for starting and running, and start communication with the Smart Key ECM, sending a PIN request to the Smart Key ECM and waiting for valid release message from it until the release time period has ended. In case of Smart Key ECM immobilizer function is locked, the Smart Key ECM answer is the no release message. Engine ECM enters in the locked state, which causes the activation of the immobilization actions of the engine. In case of Smart Key ECM immobilizer function state is released, the Smart Key ECM answer is the release message, including the information Smart Key ECM in learnt mode and the PIN code.

DTC P1690 is set Engine ECM has not received any signals related starting engine, Although Engine ECM sends wake up signal to Smart Key ECM.

Information related immobilizer, that are classified as 2 (two) parts independently, is memorized in EEPROM. ECM check these 2 (two) information before proceeding immobilizer authentication. With synchronized both information, ECM starts immobilizer authentication procedure. If both information is not synchronized, ECM stops immobilizer authentication, Limphome function will not be activated, and memorizes DTC P1695. If DTC P1695 is retrieved again, after performing new key teaching procedure, ECM should be replaced with new one.

If key/password information in ECM is not matching or there is write error on EEPROM as hardware, DTC P1696 is set.

Smart key System consists of transponder, which is in the FOB key head, and Smart key ECM. Smart Key System has FOB holder, which includes antenna coil, to communicate with transponder for immobilizer communication. Smart Key ECM communicates with PDM via serial communication line so that Smart Key ECM sends signal to PDM.

FOB is requested authentication from Smart Key ECM by using the LF antenna with LF communication. And then, FOB sends authentication signal through the SRx with RF communication.

With this procedure, Smart Key ECM sends authentication signal to Engine ECM in order to allow the engine start. Authentication for immobilizer is classified two different way. one is pre- authentication and the other is general authentication.

Regardless of success or failure, Pre-authentication makes Immobilizer lamp remains OFF. However, General authentication makes Immobilizer lamp is ON for 30 seconds If authentication is successful. However, if authentication is failed, Immobilizer lamp is OFF for 10 seconds.

  1. Condition for Pre-authentication. OFF and Driver door is open when FOB is in passenger compartment (Seek every 3 seconds for 30 seconds.) OFF and Driver door is close when FOB is in passenger compartment FOB is inserted in FOB Holder Pressing Brake pedal when FOB is in passenger compartment
  2. Condition for general authentication Pressing start button when FOB is in the passenger compartment

During the Immobilizer authentication, If there is any wrong VIN (Vehicle Identification Number) or MIN (Model Identification Number) signal on the communication message, ECM sets DTC P1696

This is special function that engine can be started for moving to an area where the key learning is processed with twice IG ON. This function is only performed in condition that Engine EMS, Smart key ECM, Transponder, PDM are all virgin status. Engine can be started by the sequence.

  1. Ignition ON with no cranking, Ignition OFF, Ignition ON with cranking within a time interval
  2. The following timing conditions have to be fulfilled for successful start: Engine EMS, Smart key ECM, Transponder, PDM are all virgin status First Ignition ON more than 0.5 seconds and less than 1.5 seconds. Ignition OFF time is limited by the minimum of 0.2 seconds and the maximum of 1.5 seconds. Ignition ON

The number of engine starts by "twice ignition on" is limited. The maximum value is 32 times regardless of cranking.

DTC P1699 is set if twice ignition ON exceeds maximum limit over 32 times.

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