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A 5. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF A/F SENSOR) (a) Connect the Techstream to the DLC3. (b) Start the engine. (c) Turn the Techstream on. Volume for A/F Sensor. (f) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling. HINT: INJECTION VOLUME STATUS VOLTAGE AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) +12.5% Rich Below 3.1 V -12.5% Lean Higher than 3.4 V O2S B1S2 or O2S B2S2 (Heated oxygen) +12.5% Rich Higher than 0.55 V -12.5% Lean Below 0.4 V Result STATUS OF AFS VOLTAGE B1S1 OR AFS VOLTAGE B2S1 STATUS OF O2S B1S2 OR O2S B2S2 AIR FUEL RATIO CONDITION AND AIR FUEL RATIO SENSOR CONDITION PROCEED TO Lean Lean Actual air fuel ratio lean A Rich Rich Actual air fuel ratio rich A Lean Lean/Rich Air fuel ratio sensor malfunction B Rich Lean/Rich Air fuel ratio sensor malfunction B Lean/Rich Lean/Rich Normal B Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V. Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently below 3.1 V, and the O2S is consistently higher than 0.55 V. |