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: Secondary Air Injection System Switching Valve "A" Circuit (P0412,P0415)
DESCRIPTION The Secondary Air Injection (AIR) system consists of an air pump, the Air Switching Valve (ASV), a pressure sensor, the Air Injection Control Driver (AID) and the ECM. For a short time after a cold engine start, the AIR system pumps secondary air to the exhaust port of the cylinder head ...