Take a photo of your circuit and post it. Your code is fine. I tested it. Your schematic shows ENable-2 is pin-8 which is NOT a PWM pin. Your code shows ENable-2 is pin-9 which is CORRECT. You should NOT have a wire connected to arduino pin-8. Post a photo of your circuit. Your motor voltage is probably too low because there is a 2 V drop across the chip. Check your wiring. If you connect a led with a 220 ohm resister to ground and for all three control signals from arduino yiu can see everything happening. I'm running TWO motors and I have SIX LEDS , 4 for DIR & 2 for PWM. I can see EVERYTHING happening. Check your motor voltage . Post a photo of your circuit. I think it would have been easier for you to draw the schematic on a piece of printer paper with a ruler and take a photo of it but if you prefer Fritzing then that's your choice. I like the freedom of a hand drawn schematic because you can do anything you want.