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P0131, P0151 A/F SENSOR 1 EC-209 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O P0131, P0151 A/F SENSOR 1 Component Description INFOID:0000000009886619 The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen- sor. The sensor element of the A/F sensor 1 is composed an elec- trode layer, which transports ions. It has a heater in the element. lean and rich range. Together with its control electronics, the sensor The exhaust gas components diffuse through the diffusion layer at the sensor cell. An electrode layer is applied voltage, and this current relative oxygen density in lean. Also this current relative hydrocar- bon density in rich. Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this electrode layer of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of about 800 °C (1,472 °F). On Board Diagnosis Logic INFOID:0000000009886620 To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately low. DTC Confirmation Procedure INFOID:0000000009886621 NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next step. Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle. 1. Start engine and warm it up to normal operating temperature. 2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT. 3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication. If the indication is constantly approx. 0V, go to If the indication is not constantly approx. 0V, go to next step. 4. Turn ignition switch OFF, wait at least 10 seconds and then restart engine. 5. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine. 6. Maintain the following conditions for about 20 consecutive seconds. PBIB3353E JPBIA5446GB DTC No. Trouble diagnosis name DTC detecting condition Possible Cause P0131 Air fuel ratio (A/F) sensor 1 • The A/F signal computed by ECM from the A/ F sensor 1 signal is constantly approx. 0V. • Harness or connectors (The A/F sensor 1 circuit is open or • Air fuel ratio (A/F) sensor 1 P0151 |