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6 or 8 cylinder? Either way the computer (ECM) controls the coils. 6 cyl has a 'coil rail' and 8 cyl had individual coils on each cylinder. There are crankshaft and camshaft sensors that tell the ecm when to fire each cylinder
suggest you take it to an autoparts store and have them read your error codes off the computer. Make sure you write them down in the order they come off the computer.
on the previa, the main fuse box is located in the top of the dash board, the panel above the heater switches comes off to reveal it. There is a little level/clip just above the heater switches hidden by the curve of the panel, push and lift. Turn the ignition switch to the "Off" position. Insure the component with the suspected blown fuse is turned off. Reach under the central instrument panel cover, located above the air conditioning controls in the center of the dashboard, and press upward on the panel cover release latch. This is where most of the fuses are located in a Toyota Previa. Lift the panel cover up and off. Observe the underside of the control panel cover. It will have a schematic diagram along with the name of each circuit controlled by the corresponding fuse. Determine the location of the fuse that controls the affected component. The Toyota Previa makes use of three different types of fuses: type A, which are thin and elongated, type B fuses that resemble a box with a window in the top to reveal the fuse link, and type C, which also resemble a box with a clear plastic top. Grasp the suspected fuse and pull straight up and out. Look down through the clear top of the fuse. If the metal connector is broken and not connected, the fuse is blown. Insert a replacement fuse of the same type and amperage rating into the vacant slot. Replace the instrument control panel and press down until it snaps closed. Turn the ignition switch to the "On" position. Activate the suspected component. If replacing the fuse did not solve the problem, troubleshoot further or take the car to a qualified technician for repairs.
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