OEM 2004 Scion xA Knock Sensor

2004 Scion xA Parts Questions & Experts Answers

• Q: How to replace the knock sensor on 2004 Scion xA?

  A: The replacement of the knock sensor starts by draining engine coolant before removing the air cleaner assembly along with separating the accelerator control cable assembly. The technician starts by removing two separate sub-assemblies that connect to the transmission oil level gauge. Then they separate the throttle body assembly by disconnecting the ISC valve connector along with the throttle position sensor connector (for M/T transaxle) and removing the wire harness clamp and taking out bolt and two nuts to detach the accelerator control cable bracket. This process includes removing the gasket from the intake manifold. Start by removing four cover nuts from the cylinder head cover No.2 as you disconnect the radiator hose inlet and disconnect the oil level gauge sub-assembly. Detach the ventilation hose after disengaging the union to connector tube hose from its support system then unfasten the three wire harness clamps before extracting the three bolts and two nuts in order while carefully obtaining the gasket from the intake manifold. The knock sensor requires the technician to disconnect its connector before utilizing Special Service Tool 09816 30010 to uninstall the sensor. Install the new knock sensor using the same tool while tightening it to 44 N.m (450 kgf.cm, 32 ft.lbf) before reattaching the connector. Reinstall the intake manifold after replacing its gasket by torquing three bolts and two nuts to 30 N.m (306 kgf.cm, 22 ft.lbf) and then secure the three wire harness clamps as well as install the union to connector tube hose and ventilation hose. Begin with installing the oil level gauge sub-assembly followed by connecting the radiator hose inlet and then installing the cylinder head cover No.2 while tightening nut A first then nut B until it reaches 7.0 N.m (71 kgf.cm, 62 in.lbf). The throttle body receives installation with a new gasket before securing it using the bolt and two nuts at 30 N.m (306 kgf.cm, 22 ft.lbf) torque. The procedure includes installation of the wire harness clamp before adding the throttle position sensor connector (for M/T transaxle) and ISC valve connector. The final step includes transmission oil filler tube sub-assembly and transmission oil level gauge sub-assembly installation for the A/T transaxle one after the other followed by the accelerator control cable assembly and air cleaner assembly installation. Furthermore, add engine coolant and perform a leak check of the cooling system.