STARTING SYSTEM


  1. FUNCTION


    1. Models with Stop and Start System


      1. When first starting the engine, if the certification ECU (smart key ECU assembly) receives a start signal from the engine switch, the certification ECU (smart key ECU assembly) sends an operation signal to the No. 1 ST relay when the shift lever is in P or N and the engine stop and start ECU sends an operation signal to the No. 2 ST relay to operate the starter assembly. At this time, the certification ECU (smart key ECU assembly) turns the ACC relay operation signal (ACCD) off to prevent flickering of the meter, clock and audio systems.

      2. When starting the engine during idling stop control, the engine stop and start ECU sends operation signals to the No. 1 ST relay and No. 2 ST relay according to the vehicle condition to operate the starter assembly.

      3. While the engine is cranking, the certification ECU (smart key ECU assembly) and/or engine stop and start ECU continues to send an operation signal to the starter relay until it has been detected that the engine has started successfully. Whether the engine has started successfully is determined by the certification ECU (smart key ECU assembly) and ECM, and once it has been determined that the engine has started successfully, the signal output from the certification ECU (smart key ECU assembly) and/or engine stop and start ECU to the starter relay is stopped.

      4. The crank hold time and engine speed when it has been determined that the engine has started successfully are determined according to the engine coolant temperature.

    2. Models without Stop and Start System


      1. When the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a start signal.

      2. When the certification ECU (smart key ECU assembly) detects a start signal (SSW1, SSW2), the certification ECU (smart key ECU assembly) outputs an No. 1 ST relay (starter relay) drive signal (STAR). The No. 1 ST relay (starter relay) activates the starter assembly when it receives this signal. At this time, the certification ECU (smart key ECU assembly) turns off the ACC relay by turning off the power sent from the ACCD terminal. The ACC relay is turned off to prevent flickering of the meters, clock and audio system.

      3. When communication between the certification ECU (smart key ECU assembly) and ECM stops, the certification ECU (smart key ECU assembly) uses the engine speed (NE) signal received from the ECM via a direct line to determine when to turn off the starter.

      4. While cranking, the certification ECU (smart key ECU assembly) continues energizing the No. 1 ST relay (starter relay) until it is determined that the engine has started. When the certification ECU (smart key ECU assembly) has judged that the engine has started, the certification ECU (smart key ECU assembly) stops energizing the No. 1 ST relay (starter relay).

      5. If the engine does not start even though the starter has cranked for 30 seconds, the No. 1 ST relay (starter relay) is turned off to protect the starter motor.

        B0056NAE22