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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-861 < SERVICE INFORMATION > [VK45DE] C D E F G H I J K L M A EC N P O DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic INFOID:0000000001326698 With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the DTC Confirmation Procedure INFOID:0000000001326699 NOTE: WITH CONSULT-III 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON- 4. Clear the self-learning control coefficient by touching “CLEAR”. 5. Start engine. a. Crank engine while depressing accelerator pedal. b. If engine starts, go to . If engine does not start, check exhaust and intake air leak visually. 6. Keep engine at idle for at least 10 minutes. 7. Check 1st trip DTC. 8. If 1st trip DTC is detected, go to If 1st trip DTC is not detected, performing the following procedure is advised. a. Turn ignition switch OFF and wait at least 10 seconds. b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 min- The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con- Sensor Input Signal to ECM ECM function Actuator A/F sensor 1 Density of oxygen in exhaust gas Fuel injection control Fuel injector DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0171 Fuel injection system too • Fuel injection system does not operate properly. large. (The mixture ratio is too lean.) • Intake air leaks P0174 |