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A low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would 1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174 OR P0175) 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/Trouble Codes. d. Read DTCs. Result RESULT REFERENCE HINT: If any DTCs other than P0171, P0172, P0174 or P0175 are output, troubleshoot those DTCs first. B: GO TO DTC CHART A: Go to Next Step 2. CHECK SENSOR OUTPUT a. Warm up the engine until the engine coolant temperature is 75°C (167°F) or more. b. Connect the Techstream to the DLC3. c. Stop the engine. d. Turn the ignition switch to ON. e. Turn the Techstream on. f. Write down the freeze frame data. HINT: By looking at the alcohol concentration learned value, Long FT and Short FT in the freeze frame g. Clear the DTCs (See DTC CHECK/CLEAR ). HINT: Even if no DTCs are stored, perform the DTC clear operation to start alcohol concentration Result Proceed to P0171, P0172, P0174 or P0175 is output A P0171, P0172, P0174 or P0175 and other DTCs are output B
2009 Toyota Tundra 2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
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