DESCRIPTION This DTC is output when a communication error occurs in the ECM.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS Case 1 and 4
TYPICAL MALFUNCTION THRESHOLDS Case 1
CONFIRMATION DRIVING PATTERN
CAUTION / NOTICE / HINT NOTICE: After
turning ignition switch off, waiting time may be required before
disconnecting the cable from the negative (-) battery terminal.
Therefore, make sure to read the disconnecting the cable from the
negative (-) battery terminal notices before proceeding with work (See
page HINT: Read freeze frame data using a Techstream. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred. PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Clear DTCs (See page (e) Turn the Techstream off. (f) Turn the ignition switch off. (g) Disconnect the Techstream. (h) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. (i) Connect the cable to the negative (-) battery terminal. (j) Connect the Techstream to the DLC3. (k) Turn the ignition switch to ON and turn the Techstream on. (l) Wait 16 seconds or more. (m) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. (n) Check for DTCs. Result
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Toyota Tundra Service Manual > Sfi System: Exhaust Gas Recirculation Flow Insufficient Detected (P0401)
DESCRIPTION Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to the engine's combustion chambers and thus lowers the combustion temperature to reduce NOx emissions. The ECM monitors signals such as engine speed, coolant temperature, electric load, and ...