All that's left to troubleshoot is the engine control circuit that sends one switched ground signal to the pump relay. Even shutting off the ignition that kills the EFI electronics to stop the engine is good to know despite the fuel pump still running. It will also bolster your troubleshooting skills knowing that the engine runs. This also ensures that the injectors are pulsing as the fuel pressure ensures proper fuel. No rocket science here, just simple procedures to follow as long as you're capable of understanding things in general and following through carefully with descriptive replies.ĭid you try to see if the engine runs with the wire jumper in place? This is perfectly safe as all you're doing is allowing the pump to run before the engine is started the rest of the fuel system is regulated to ensure correct fuel pressure so the engine is needed to turn over and complete this test. Ok, with security out of the way, the fuel pump and wiring in working order with a wire jumper, and your ability to work carefully on wiring, this makes it easier to narrow down your problem. Tread carefully here.Īn incorrect relay can cause more problems. Not hearing the pump run at ignition ON time may be the key to this problem and tied to pins 85 or 86.
If the relay solenoid doesn't energize then the contacts (30 & 87) won't close to send 12v to the pump. These two pins allow the relay solenoid to energize. One pin is switched ignition power while the other pin is switched ground from the engine computer. This switched ground signal is either pin 85 or 86. The engine computer switches a ground signal to allow the fuel pump relay to power up before closing relay contacts 30 and 87 that sends 12v power to the pump. Verifying this just confirms part of the pump circuit. Hearing the pump run should allow starting and running. I'm confused about your jumper wire attempt on the fuel pump relay socket.Ģ-Did you wire a jumper across pump relay socket pins 30 and 87? Regardless of ignition switch position, a wire jumper across these two socket pins will send 12v immediately to the fuel pump. I'm sure anyone else here can use the same info.Īlthough it may seem anal to some, hearing/not hearing the pump run relative to ignition ON time is an excellent clue. I'm just another armchair quarterback and may help you find the answer if given all the info. You're the only pair of eyeballs to describe what you see and hear. Lets get some things out of the way as spotty posts with little info makes for very long threads.ġ-Is the security indicator ever ON during starting? While not directly related to this issue, it helps to paint the picture we all need as we're not there to see what you see. I get power to the fuel pump wiring harness in this situation, but I don't get power with the relay in.Īny fresh ideas? I am thinking about replacing the computer at this point. I also tried jumping the fuel pump relay and turning the key on.
I thought it might be a ground issue because the lights are staying on as well, but I checked the grounds for the pump and lights at the rear right side in the trunk area.everything seemed normal.
I even pressed my ear right up to the tank when the key is turned on but it never hums. But when I turn the key, I never hear the motor running. The fuel pump works fine when I apply power to it. I already replaced the Crankshaft position sensor and I dropped the tank to test the pump. So here I am a month still turns over, cranks but never fires. I checked the fuses and ended up getting it towed home. The only way to stop the brake lights was to pull the brake light fuse.Īnyway, So I got a whole new battery, but the car still wouldn't start. I think the battery died from the brake lights running it down, because I also noticed at this point that the brake lights would not shut off, even with the key out. I realized the battery was dead, so i went to get it charged and they told me it couldn't be charged (although it was 3 months old). I was driving to the airport about a month ago for a weeklong trip in heavy rains. So I'm nearing my wits end on this issue and I need some fresh ideas.
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