Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
i am having issues getting power to fuel pump i've plugged my autel to it and im ashamed to admit ive been part changing at first i thought it was a bad pump purchased but it runs good for maybe a week and then completely shuts down no power getting to fuel pump i have checked and changed relay it ran again for around same time period and shut down again this vehicle has a full tune up from new cap and rotor down to plugs im lost at this point and the purchase of this van is very vital to me and my plans to start a carer doing something i love to put food on the table and attemt to keep the rain off my family's head please help
Hey mesquito! Let's start with some voltage checks at the underhood fuse box. Remove the fuel pump relay, turn the key on and install your Autel scanner. Get a battery charger installed if needed.
Using an incandescent test light connected to B- (not LED and not a multimeter), gently probe all four fuel pump relay pins in the fuse box. One should light the test light brightly. Then, use the Autel to command the fuel pump relay on. Now two of the four pins should light up brightly.
If NONE of the pins ever lit up with the key on, you're missing a power feed to the load side of the relay.
If you were only able to get one pin to light up, that'd suggest the PCM isn't able to control the relay.
If you got two pins to light up, then the load side power to the relay is fine, and so is the PCM's relay driver.
Topic Author
