OEM 2007 Scion tC Knock Sensor

2007 Scion tC Parts Questions & Experts Answers

• Q: How to service the knock sensor on 2007 Scion tC?

  A: Service of the knock sensor requires a procedure of fuel system pressure discharge coupled with coolant draining followed by disconnecting the negative battery cable for a minimum wait of 90 seconds to avoid Air Bag and seat belt pretensioner activation. The head cap of the wiper arm, both front wiper arms (RHS and LHS), hood to cowl top seal and cowl top ventilator louver (RHS) require clocking off the wire harness clamp then removing 7 bolts with the front wiper arm (RHS) and cowl top panel (left side) before extraction. Start by uninstalling the cowl body mounting bracket lower from its left-hand side position by first removing its bolt followed by the clip and bracket. The engine cover as well as the air cleaner cap and throttle body and fuel delivery pipe with fuel tube come next in the order. But ensure to take proper steps when you remove the fuel tube clamp and disconnect the fuel tube connector without damaging the connector. The next step involves heating two hoses followed by disconnecting the union to check valve hose from the brake booster and removing the camshaft timing oil control valve connector and wire harness clamp. Finally, the intake manifold is separated by taking out 5 bolts and 2 nuts and the gasket. First disconnect the sensor connector from the knock sensor before taking off the intake manifold insulator together with the knock sensor and its nut. To install the knock sensor begin by placing the nut on then tighten it to 20 N.m (205 kgf.cm, 15 ft.lbf) with proper sensor orientation before connecting its connector. After fitting the intake manifold insulator onto the cylinder block you must place a new gasket into the intake manifold before tightening the 5 bolts and 2 nuts to 30 N.m (305 kgf.cm, 22 ft.lbf) while also reconnecting the union to check valve hose and wire harness clamp and camshaft timing oil control valve connector. First measure and position the hose clamps correctly before installing the heater water outlet hose towards the water bypass pipe and heater radiator unit. Then do the same with the heater water inlet hose which will route through the cylinder head and heater radiator unit. To install these parts simultaneously use the following sequence: Place the fuel tube connector on the pipe then push until it clicks before installing the fuel delivery pipe followed by the throttle body then the air cleaner cap followed by the cowl body mounting bracket lower (LH) with bolt and clip fastened at 13 N.m (135 kgf.cm, 10 ft.lbf). The cowl top panel outer receives 7 bolts installation with equivalent torque levels followed by wire harness clamp and wiper link installation before battery cable connection to the negative terminal. The technician should add coolant to the engine while inspecting both fuel and coolant system leaks. To finish the installation process you should add the engine cover followed by the cowl top ventilator louver (LH) and the hood to cowl top seal then install both front wiper arms (LH and RH) and eliminate the front wiper arm head cap, then initiate system startup after battery reconnection.