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P2A00 A/F SENSOR 1 EC-363 < COMPONENT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O P2A00 A/F SENSOR 1 Component Description INFOID:0000000005273404 The A/F sensor 1 is a planar dual-cell limit current sensor. The sen- < air). The exhaust gas components diffuse through the diffusion gap at the An electronic circuit controls the pump current through the oxygen- ° C (1,292 - 1,472 ° F). On Board Diagnosis Logic INFOID:0000000005273405 To judge the malfunction, the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is mon- DTC Confirmation Procedure INFOID:0000000005273406 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 coefficient by touching “CLEAR”. 5. Turn ignition switch OFF and wait at least 10 seconds. 6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load. 7. Let engine idle for 1 minute. 8. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes. 9. Check 1st trip DTC. SEF579Z SEF580Z DTC No. Trouble diagnosis name DTC detecting condition Possible Cause P2A00 Air fuel ratio (A/F) sensor 1 • The output voltage computed by ECM from the air fuel ratio (A/F) sensor 1 signal is shifted to • The A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is shifted to the • Air fuel ratio (A/F) sensor 1 |