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Home >> Lexus >> 1998 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Engine Sensors >> Knock Sensor >> Removal (SC400)
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Removal (SC400)

  1. Knock sensors are located under intake manifolds on inside center of each cylinder head. To remove knock sensors, remove engine cover. Remove intake air connector pipe. Remove throttle body. See THROTTLE BODY . Disconnect throttle position sensor, accelerator pedal position sensor and throttle control motor connectors.
  2. Disconnect EVAP and ACIS vacuum switching valve connectors. Disconnect injector connectors. Disconnect noise filter and camshaft timing oil control valve connectors.
  3. Disconnect brake booster vacuum hose. Disconnect PCV hose. Disconnect EVAP vacuum switching valve hose. Disconnect PS air hose from intake manifold. See Figure. Disconnect rear water bypass joint heater hose. Disconnect water bypass pipe heater hose. Disconnect vacuum hose from heater water valve vacuum switching valve.
  4. Disconnect water bypass hoses from throttle body. Disconnect wire clamp from throttle body. Disconnect wire clamps from wire clamp bracket on right fuel rail. Remove bolt and wire clamp bracket from right front bearing cap.
  5. Remove bolts, and disconnect engine wire protector from rear water bypass joint and right cylinder head. Remove EVAP vacuum switching valve bolt. Remove bolt and wire clamp bracket from left valve cover. Remove bolts, and disconnect engine wire protector from intake manifold and left front bearing cap. Remove bolts, nuts, intake manifold assembly and gaskets. Disconnect knock sensor connectors. Remove knock sensors.
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