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!
My wife's was driving her terrain about 3 miles, it started chugging and died wont restart.
codes present P00CA,P00C8,P0090,P0092.
It start run about 30 seconds in that time fuel stayed around 64 psi. Since my scan tool won't flash fuel pump control module i got high pressure fuel pump still won't start.. Can you give any tips. Also key on 12 volts to high pressure pump.. Thank you
All those codes are related to a circuit high condition in the high fuel pressure regulator circuit.
With the key on and the engine off, backprobe one high fuel pressure regulator pin at a time and take a voltage reading with the meter grounded to B-. What are your voltage readings on both wires?
Looking good so far. I took some known good readings off an '11 Equinox. Same engine.
Now, KOEO, disconnect the pump connector and recheck voltage on both wires. Should have 12V on the yellow, and 0V on the purple. The 12V on the yellow should NOT be able to light a test light connected to B-.
Looking good to me. Those readings match my known good exactly.
Can you measure high pressure fuel pump resistance? Connector unplugged, across both pins. I don't have a spec available at the moment - I'd expect five ohms or less.
Something is not allowing high pressure fuel pump to run, when I use starting fluid it idles at only 62 to 66 psi fuel pressure. Which is about the same as KOEO.
Kind of odd tried to erase, It said permanent they wouldn't erase. But I only have otc 3111. Going to get a launch or autel as soon as I decide on which one.
Those readings match my known good exactly.
