2005 Toyota Avalon check engine light on

P0352 Ignition Coil "B" Primary/Secondary Circuit Malfunction

This is igniter code for #2 coil. There is an IGf or IGt circuit failure. The computer sends out a trigger signal (IGt) to the igniter. The igniter turns on the ground circuit to energize the secondary portion of the coil. When the coil field collapses, the induced voltage trips the IGf signal to confirm that the coil fired and this signal is reported to the computer by way of the IGf wire/input. If the computer does not see IGf it shuts down the injectors. The best way to test this circuit is with a scope. Either the coil is not strong enough to trigger IGf or the wires to the computer are open or shorted. Ohm test the wires for continuity and resistance to ground. Make sure they are disconnected on both ends. If you don't have any test equipment check all of your female pins to make sure they are tight, at the computer and the igniter. If the same codes are back there may be an issue in the wiring or pins.