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P0172 FUEL INJECTION SYSTEM FUNCTION EC-657 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O P0172 FUEL INJECTION SYSTEM FUNCTION DTC Description INFOID:0000000010986353 DTC DETECTION LOGIC With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the POSSIBLE CAUSE • A/F sensor 1 FAIL-SAFE Traveling control mode (Accelerator angle variation control) DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE-1 1. Clear the mixture ratio self-learning value. Refer to . 2. Start engine. Is it difficult to start engine? YES >> GO TO 3. NO >> GO TO 4. 3. RESTART ENGINE If it is difficult to start engine, the fuel injection system has a malfunction, too. Does engine start? YES >> Proceed to . NO >> Check exhaust and intake air leak visually. 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. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition P0172 FUEL SYS-RICH-B1 • Fuel injection system does not operate properly. is too rich.) |