Removal (Avalon & Camry)
- Air intake chamber and intake manifold must be removed for access to knock sensors. Knock sensors are located on cylinder block, just below cylinder heads. See Fig 1-5.
- Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM. Drain cooling system. Remove air cleaner hose and "V" bank cover. See Fig 4. Remove bolts and engine mount support brace for engine mount at timing belt end of engine. Engine mount support brace fits from top of coolant housing to the engine mount.
- Remove spark plug wire assembly. Disconnect control cables, electrical connectors, vacuum hoses and coolant hoses at throttle body. Disconnect electrical connectors and vacuum hoses from vacuum switching valves on emission control valve set located on side of air intake chamber. See Fig 4.
- Remove Data Link Connector No. 1 (DLC1) from end of bracket. See Fig 4. Remove nuts and disconnect power steering pressure tube from engine hanger. Disconnect necessary electrical connectors, ground straps, air hoses and vacuum hoses for removal of air intake chamber and intake manifold. Disconnect PCV hose from PCV valve on rear cylinder head.
- Remove bolts, engine hanger and air intake chamber support brace from air intake chamber. Remove bolts/nuts, EGR pipe and gaskets. Remove bolts/nuts, air intake chamber and gasket.
- Note location of electrical connectors on fuel injectors for installation reference. Disconnect electrical connectors at fuel injectors. Remove fuel pipe clamp from No. 1 fuel pipe at fuel filter. Perform STEP 1. See Fig 5. Ensure area around No. 1 fuel pipe and fuel filter is clean.CAUTION: Use care when disconnecting No. 1 fuel pipe from fuel filter, as some residual fuel pressure may still exist in the fuel system.
- Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel filter. Perform STEP 2. See Fig 5. Disconnect hose for air assist assembly at throttle body.
- Disconnect coolant hoses at intake manifold. Remove bolts/nuts and intake manifold with fuel injectors and fuel rails as an assembly. Remove gaskets for intake manifold.
- Disconnect electrical connectors and hoses for removal of coolant housing. Coolant housing is located on cylinder block, in front of intake manifold area. See Fig 4. Remove bolts/nuts, coolant housing and gaskets. Disconnect electrical connectors at knock sensors. Using Socket (SST 09817-16011), remove knock sensor(s) from cylinder block.