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Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Smart Access System (For Start) - Symptom Tests (2 Of 2)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) >> Engine does not Start [03/2023 - ] >> Description

Engine does not Start [03/2023 - ]: Description

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When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift position is in P and the brake pedal is depressed, the engine can be started by pressing the engine switch.

RELATED DATA LIST AND ACTIVE TEST ITEMS

Problem Symptom Data List and Active Test
Engine does not start Power Source Control 
  • Stop Light Switch
  • Shift P Signal Condition (Line)
  • Neutral SW/ Clutch SW
  • Starter Relay Driving Request (Starting Control)
  • Starter Relay
  • Power Supply Condition

Smart Access 

  • Immobilizer
  • Start Request
  • L Code Check
  • S Code Check
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