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TSB Revision DIAGNOSTIC TROUBLE CODE PROCEDURES 13Ac-273 STEP 12. Test the OBD-II drive cycle. GROUP 13A, Procedure 6 − Other Monitor (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. DTC P0171: System too Lean (bank 1) . Fuel Trim Circuit • Refer to DTC P0201 − P0206, Injector Circuit. . CIRCUIT OPERATION • Refer to DTC P0201 − P0206, Injector Circuit. . TECHNICAL DESCRIPTION • If a malfunction occurs in the fuel system, the fuel trim value becomes too large. • The PCM checks whether the fuel trim value is within a specified range. . DTC SET CONDITIONS Check Conditions • Engine coolant temperature is lower than approx- imately 100 °C (212°F) when the engine is started. • Intake air temperature is lower than 60°C (140°F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or more. Judgment Criteria • Long-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be higher than +7.4 percent for 5 seconds. Check Conditions • Engine coolant temperature is lower than approx- imately 100 °C (212°F) when the engine is started. • Intake air temperature is lower than 60°C (140°F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or less. Judgment Criteria • Long-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. Check Conditions • Engine coolant temperature is higher than approximately 100 °C (212°F) when the engine is started. • Intake air temperature is higher than 60°C (140 °F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or more. Judgment Criteria • Long-term fuel trim has continued to be higher than +12.5 percent or 5 seconds. or • Short-term fuel trim has continued to be higher than +17.6 percent for 5 seconds. Check Conditions • Engine coolant temperature is higher than approximately 100 °C (212°F) when the engine is started. • Intake air temperature is higher than 60°C (140 °F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or less. |