Toyota 22270-42010 Valve Assembly, Idle Speed Control

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Start the engine and then turn it off, verifying that the Idle Control Valve makes a clicking sound immediately after the engine stops; if it doesn't, remove and bench test the valve. Disconnect the cable from the negative terminal of the battery, ensuring to check for any anti-theft system in the stereo before detaching the cable. Unplug the Idle Control Valve electrical connectors, then detach the coolant by-pass hoses and air hoses from the Idle Control Valve, plugging the coolant hoses if coolant begins to flow out. Remove the Idle Control Valve mounting bolts, the valve, and the gasket, and for turbo models, also remove the seal washer and check valve from the air intake chamber. Using an ohmmeter, measure the resistance between terminal B1 and S1 or S3, and between B2 and S2 or S4, comparing the measurements to the specific resistance values; if they are outside the specified range, replace the Idle Control Valve. Apply battery voltage to terminals B1 and B2 while grounding terminals S1, S2, S3, S4 in sequence to verify that the valve moves toward the closed position, and then repeat the process grounding in reverse order to check for movement toward the open position; if the valve does not perform as expected, replace it. For installation, reverse the removal steps, ensuring to install the check valve and seal washer in the air intake chamber first for turbo models, and use a new gasket on all models. Finally, check the coolant level and add as necessary to reach the desired level.