Details On DTCs

WARNING: This page is about a different variant/trim than selected.

P0171-00: (PCM - VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Fuel trim system too lean
Detection condition	Determination conditions	Any one of the following conditions is met: The specified period of time has elapsed while the sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or more and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or more. The specified period of time has elapsed while the fuel feedback correction amount reaches maximum value during idling or driving.
	Preconditions	Engine coolant temperature: 0-45°C {32-113°F}, 6 0°C {140°F} or more ^1 ^1 : Standard can be verified by displaying PIDs using M-MDS
	Malfunction determination period	10 s period or 20 s period
	Drive cycle	2
	Self test type	CMDTC self test
	Sensor used	A/F sensor
Fail-safe	Not applicable
Vehicle status when DTCs are output	Not applicable
Possible cause	PCM input signal error ECT sensor signal MAF sensor signal MAP sensor signal IAT sensor No. 2 signal Input signal parts connector or terminal malfunction Input signal related wiring harness malfunction Fuel system (high pressure side) malfunction (fuel pressure malfunction) High fuel pressure sensor malfunction Relief valve (built-into high pressure fuel pump) malfunction Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system) Spill valve control solenoid valve malfunction (built-into high pressure fuel pump) High pressure fuel pump malfunction Fuel leakage in fuel line Fuel system (low pressure side) malfunction (fuel pressure malfunction) Fuel filter clogged (built-into fuel pump unit) Fuel hose, pipe clogging Fuel pump unit malfunction Pressure regulator (built-into fuel pump unit) malfunction Fuel pump control module malfunction Fuel injector malfunction Improper operation of fuel injector Fuel injector related wiring harness malfunction Improper operation of purge control system Purge solenoid valve malfunction Purge solenoid valve system-related piping malfunction PCV valve malfunction MAF sensor malfunction Air cleaner element malfunction MAP sensor malfunction Air suction in intake air system Electric variable valve timing system malfunction Electric variable valve timing driver malfunction Electric variable valve timing motor malfunction Electric variable valve timing actuator malfunction Hydraulic variable valve timing system malfunction A/F sensor malfunction A/F sensor incorrect installation Exhaust gas leakage from exhaust system Inferior fuel added PCM malfunction