DTC P1605-00: Rough Idling [12/2019 - 10/2022]: Description

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

Using the GTS, 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	Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) 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