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Home >> Lexus >> 2009 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0351-U0001) - Circuit Tests) >> SFI System >> DTC P050B: Cold Start Ignition Timing Performance >> Inspection Procedure

Inspection Procedure

HINT: 

DTC P050B may be set when the engine has the symptoms listed below. If necessary, check the trouble area listed below.

Symptom Factor Trouble Area
Low idle speed when engine is cold Excessive engine friction
  • Engine oil deterioration
  • Drive belt tension
  • A/C compressor
  • Generator
  • P/S pump
Rough idle when engine is cold Abnormal combustion
  • Fuel quality
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