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Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. a. Connect the Techstream to the DLC3. b. Turn the ignition switch to ON and turn the Techstream ON. c. Enter the following menus: Powertrain/Engine and ECT/Data List/A/F Control System/Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 d. Read the values displayed on the Techstream. e. Add together the Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values to obtain the total Fuel Trim. Result: Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between - NG : Go to step 4 OK : Go To Next Step 3. CHECK THROTTLE BODY a. Check for deposits around the throttle valve and throttle valve condition. OK: No deposits around throttle valve and throttle valve moves smoothly. NG : Go to step 8 OK : Go to step 9 4. CHECK VVT SYSTEM a. Allow the engine to idle with the engine warmed up. b. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the VVT System (Bank 1) or Control the VVT System (Bank 2). c. Turn on Control the VVT System (Bank 1) or Control the VVT System (Bank 2) to advance the valve timing. d. Check the engine condition. OK: The engine stalls or idles roughly when Control the VVT System is ON (VVT system is NG : Go to step 10 OK : Go To Next Step 5. CHECK PCV SYSTEM a. Allow the engine to idle.
2008 Toyota Tundra 2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
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