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A CASE A/F SENSOR (SENSOR 1) OUTPUT VOLTAGE HO2 SENSOR (SENSOR 2) OUTPUT VOLTAGE MAIN SUSPECTED TROUBLE AREA system (Air-fuel ratio extremely rich or lean) Following the Control the Injection Volume for A/F sensor procedure enables technicians to check and graph the voltage for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2. HINT: If a malfunction cannot be found when troubleshooting DTC P0420 or P0430, a lean or rich abnormality may be the cause. PROCEDURE 1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 OR P0430) (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. (e) Read DTCs. Result RESULT PROCEED TO DTC P0420 or P0430 is output A DTC P0420 or P0430 and other DTCs are output B HINT: If any DTCs other than P0420 or P0430 are output, troubleshoot those DTCs first. B GO TO DTC CHART 2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME) (a) Connect the Techstream to the DLC3. (b) Start the engine. (c) Turn the Techstream on. Sensor. 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0420,P043... |