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2. Start the engine and turn the Techstream ON. 3. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds. 4. On the Techstream, enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Injection Volume for A/F sensor. 5. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.) 6. Monitor the output voltages of the A/F and HO2 sensors (AFS B1 S1 and O2S B1 S2 or AFS B2 S1 and O2S B2 S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by Each sensor reacts in accordance with increases and decreases in the fuel injection volume. VOLTAGE REFERENCE VOLTAGE REFERENCE Tester Display (Sensor) Injection Volume Status Voltage AFS B1 S1 or AFS B2 S1 (A/F) +25% Rich Less than 3.0 V AFS B1 S1 or AFS B2 S1 (A/F) -12.5% Lean More than 3.35 V O2S B1 S2 or O2S B2 S2 (HO2) +25% Rich More than 0.55 V O2S B1 S2 or O2S B2 S2 (HO2) -12.5% Lean Less than 0.4 V NOTE: The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and Case A/F Sensor (Sensor 1) Output Voltage HO2 Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 A/F sensor A/F sensor heater A/F sensor circuit 3 HO2 sensor HO2 sensor heater HO2 sensor circuit Injector Fuel pressure
2008 Toyota Tundra 2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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