Engine does not Start: Description
- ENGINE START SYSTEM FUNCTION
- If the engine switch is pressed with the shift lever is in the P or N position and the brake pedal depressed, the main body ECU (instrument panel junction block) determines that it is an engine start request.
- The certification ECU (smart key ECU assembly) and other ECUs perform key verification via the LIN communication line.
- The main body ECU (instrument panel junction block) activates the ACC relay.
- The main body ECU (instrument panel junction block) activates the IG1 and IG2 relays.
- The certification ECU (smart key ECU assembly) outputs a steering UNLOCK signal. The signal is sent to the main body ECU (instrument panel junction block) via the steering lock ECU.
- The main body ECU (instrument panel junction block) sends an engine start request signal to the ECM.
- The ECM sends an ACC cut request signal to the main body ECU (instrument panel junction block).
- The ECM and main body ECU (instrument panel junction block) activate the starter relay.
- The main body ECU (instrument panel junction block) deactivates the ACC relay until the main body ECU (instrument panel junction block) detects an engine start.
- When engine revolution speed reaches 1200 RPM, the ECM determines that the engine has been started.
The ECM stops sending an ACC cut request signal to the main body ECU.
The main body ECU (instrument panel junction block) reactivates the ACC relay and turns off the engine switch indicator light, when engine revolution speed reaches 800 RPM.
Symbol of main body ECU Signal STP Stop light switch ON signal Input SSW1/SSW2 Engine switch ON signal Input ACCD ACC relay operation signal Output SLP Steering lock actuator position signal Input IG1D IG1 relay operation signal Output IG2D IG2 relay operation signal Output STR2 Starter relay operation signal (Sub) Output STR Park/Neutral position switch signal / Clutch pedal switch signal Input TACH Engine start detection signal Input STSW Starter activation request signal Output ACCR ACC cut request signal Input Symbol of ECM Signal ACCR ACC cut request signal Output TACH Engine revolution speed signal Output STSW Starter activation request signal Input STAR Starter relay operation signal (Main) Output STA Starter activation signal Input