REMOVAL CAUTION / NOTICE / HINT HINT: If the thermostat was not installed, cooling efficiency would decrease. Even if the engine tends to overheat, do not remove the thermostat. PROCEDURE 1. REMOVE NO. 1 ENGINE UNDER COVER 2. DRAIN ENGINE COOLANT
3. REMOVE V-BANK COVER SUB-ASSEMBLY 4. REMOVE AIR CLEANER ASSEMBLY 5. REMOVE AIR TUBE SUB-ASSEMBLY LH
(b) Disconnect the water by-pass hose.
(d) Remove the bolt and disconnect the air tube LH from the water inlet housing.
(f) Remove the 2 bolts and disconnect the air hose from the air switching valve LH. (g) Remove the air tube LH. 6. DISCONNECT OUTLET RADIATOR HOSE
7. REMOVE WATER INLET SUB-ASSEMBLY WITH THERMOSTAT
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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 ...