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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 150 (Engine Control System (2GR-FKS) - Diagnostic Codes (08 Of 10)) >> SFI System >> DTC P1605-00: Rough Idling [08/2021 - ] >> Description

DTC P1605-00: Rough Idling [08/2021 - ]: Description

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This DTC is stored if the combustion state of any cylinder is unstable.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when idling is unstable due to running out of fuel.

DTC No. Detection Item DTC Detection Condition MIL Memory Note
P1605-00 Rough Idling When idling with the accelerator pedal released and the vehicle stopped, this item detects when the combustion is worsening at predetermined levels from the changes in engine speed between the cylinders.
Detection for 2 to 10 seconds according to the combustion state (1 trip detection logic).		 Does not come on DTC stored SAE Code: P1605
DTC for Mexico Models:
- Applies
Trouble Area
Ignition system
  • Spark plug
  • Ignition coil assembly
Fuel system
  • Port fuel injector assembly
  • Direct fuel injector assembly
  • Fuel pump (for low pressure side)
  • Fuel pump assembly (for high pressure side)
  • Fuel pump control circuit
  • Fuel line
  • Purge VSV system
  • Fuel quality (existence of foreign matter, degradation)
Intake and exhaust systems
  • Mass air flow meter sub-assembly
  • Intake system

    (Air leaks or deposit accumulation)

  • Throttle body with motor assembly
  • Air fuel ratio sensor
  • Heated oxygen sensor
  • Cam timing oil control solenoid assembly
  • Camshaft timing oil control valve assembly
  • Variable Valve Timing system (VVT system)
Other control systems
  • ECM
  • Wire harness or connector
  • Knock control sensor
  • Engine coolant temperature sensor
Engine
  • Water inlet with thermostat sub-assembly
  • Engine assembly
High load from another system
  • Air conditioning system
  • Power steering system
  • Electrical load signal system
  • A/T system
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