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2001 optima, NO Start
This is my bosses car and I would appreciate any help. I checked the online service manual and it kinda sucked. No Detail of how the FI system works.
I found that injectors on cylinders 3 and 4 were not working(getting switched). With the plugs out cylinders 1 and 2 were wet and 3,4 dry. I hooked a test light to the plug on both 1,2 and they both lit when I cranked her. Nothing when I tried 3,4.
I assume that the ECU controls all this and that there is no other reason they are not all working? Do ECUs go out a lot on these?
One other thing that bothers me is that the fuel pump runs whenever the key is turned to the run position. Most cars I am aware of will run the fuel pump a few seconds to build the fuel pressure back up and then shut off when the key is turned to run and before you start it.
Thanks for any help. My speciality is german cars. I am not finding a lot of info for Kias.
Well you can ask 1fastkia about it, but I think he might say what I'm about to say.. I believe that the third and fourth injectors have gone bad.
My suggestion? Take them down to either an autoparts store or a familiar garage (with mechanics that you KNOW) and have them tested again. Otherwise, it might be time to replace those injectors (but I am NOT a mechanic, and haven't dealt with this type of situation.. so I could be wrong).
Did you check the fuel injection relay, although I couldn't imagine that the car would have 2 relays one for cylinders 1&2 and one for cyls 3&4, but you never know, if not then its either a ecu gone bad or damaged wires somewhere between the injection harness and the ECU.
Normally the injecters have 12V+ at them when the engine is on or cranking, its only the earth is switched on/off by the ECU for pulsing, if you can confirm whether 12V+ is at the injector then you know it is wiring or ECU at fault if there is no 12V+ then the power supply is faulty and the ECU is probably OK.
Yeah, I checked the fuses. There is only one for all the injectors. Thanks for the confirming the ecu controls the ground. I will have to check it out again and see which I am not getting.
I checked the power and grounds. With the key on I get power to all the injectors so that means I am not getting ground from the ecu to the 3,4 injectors. On a side note the codes were pulled and it showed a camshaft position sensor fault.
I checked the power and grounds. With the key on I get power to all the injectors so that means I am not getting ground from the ecu to the 3,4 injectors. On a side note the codes were pulled and it showed a camshaft position sensor fault.
IMHO I think you problem is you camshaft sensor fault, if I remember the design logic without that signal you will get no injector pulse.
BTW
I have a hardcopy manual for the RH drive sedona/carnival and it is just as poorly written as the online manuals.
Well, new camshaft position sensor did not change anything. The reason it may have had that code is because I think I cranked it with it unplugged. Somebody else scanned it and probaly didn't reset the codes, crank again, and rescan it.
I really didn't expect that to fix it as it 1,2 were getting actuated. It makes no sense to me that half would work and not the other two if it were that. They open and close in a sequence matching the plugs firing, (excluding the waste firing).
Classic Boy, the only manual I found was the one I linked to. Is there anything else out there with a wiring schematic or troubleshooring chart? Something explaining the fuel injection system?
fuel injecors not working
Linear Mode
