|
|
EC-392 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] P117A AIR FUEL RATIO P117A AIR FUEL RATIO DTC Description INFOID:0000000011278109 DTC DETECTION LOGIC POSSIBLE CAUSE • Fuel injector • Exhaust gas leaks • Incorrect fuel pressure • Mass air flow sensor • Intake air leaks • Lack of fuel • Incorrect PCV hose connection • Improper spark plug • Insufficient compression • The fuel injector circuit is open or shorted • Ignition coil • The ignition signal circuit is open or shorted FAIL-SAFE Not applicable DTC CONFIRMATION PROCEDURE 1. CHECK DTC PRIORITY If DTC P117A is displayed with other DTC, first perform the trouble diagnosis for other DTC. YES >> Perform diagnosis of applicable. Refer to . NO >> GO TO 2. 2. PRECONDITIONING-1 If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next test. 1. 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. NOTE: Before performing the following procedure, confirm that battery voltage is 11 V or more at idle. >> GO TO 3. 3. PRECONDITIONING-2 1. Turn ignition switch ON. 2. Clear the mixture ratio self-learning value. Refer to . Will CONSULT be used? YES >> GO TO 4. NO >> GO TO 7. 4. PERFORM DTC CONFIRMATION PROCEDURE-1 1. Turn ignition switch ON. 2. Select “COOLAN TEMP/S” in “DATA MONITOR” mode of “ENGINE” using CONSULT. 3. Start engine. 4. Make sure that “COOLAN TEMP/S” indicates more than 80 °C (176°F). DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition P117A AIR FUEL RATIO B1 ECM detects a lean/rich air fuel ratio state in any cylinder for a specified |