To check the throttle body, ensure that the throttle linkage is moving freely, start the engine, disconnect each vacuum hose, and check the vacuum at every port with the engine idling and above the idle speed, then relate results with vacuum table available. For replacement, remove the cable from the negative terminal of battery, drain the radiator, if needed, then remove the hose clamps, air intake duct, accelerator cable from the throttle lever arm, throttle valve cable if coupled with an automatic transaxle, vacuum and coolant hoses label them, and disconnect the electrical connector for throttle position sensor, take out the mounting bolts of throttle body, disconnect and take off the throttle body with gasket, clean the To test TPS, disconnect the electrical connector, place a feeler gauge between the throttle stop screw and stop lever, test with an ohmmeter, if it cannot be adjusted within specifications then it has to be replaced. For the fuel pressure regulator, unscrew the fuel tank cap, disconnect the negative terminal of the battery cable, disconnect the vacuum line hose, put a container below the fuel return line, loosen the banjo bolt, unscrew the pressure regulator mounting bolts, and separate the regulator from the fuel rail but when reconnecting, ensure you replace the crush washers. For the cold start injector, disconnect the electrical connector, check the resistance between the two terminals of cold start injector and replace one if the resistance range is not well taken. The idle speed control valve involves starting the engine, inspecting the idle speed, shorting terminals to test and verifying the signals and replacing the control valve if faulty. For fuel rail and fuel injectors relieve fuel tank pressure, disconnect the negative terminal of the battery cable, disconnect accelerator cable, remove the electrical connector of cold start Injectors, disconnect the fuel line, remove the fuel rail mounting bolts, unbolt fuel rail/injector assembly, remove the fuel injected and replace the old ones with new injectors and seals using grommets and O-rings.
Posted by ToyotaPartsDeal Specialist 
