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Kia Optima

10/14/2010 2:45 PM

2004 Kia Optima, fuel injectors not getting ground, how to fix it?

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#1

Re: Kia Optima

10/14/2010 2:55 PM

Ground them! - There, problem solved.

Just kidding, have you tried researching this using Google?

There are a few forums found on Google that could possibly help you.

Do you have access to a shop manual?

These are a few options that should be able to help you.

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#2

Re: Kia Optima

10/14/2010 9:44 PM

Depending on the design of the fuel injection system, you may find that the injector drivers switch to ground rather than to supply.

You will know this by measuring a constant voltage (which may not be 12 volts could be 3volts on some systems) on the injector, you will see a slightly lower voltage on the unsupplied terminal due to measuring the voltage drop across the injector coil.

Be careful poking around as terminal consequences are bound to occur.

Refer to the service manual wiring diagrams as a start.

Try and find a forum site that deals with the Kia brand, and search there.

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#3

Re: Kia Optima

10/14/2010 11:08 PM

If you are lacking the ground on your injectors, you will have set one, or more trouble codes. Get them checked before you burn up that computer.

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#4

Re: Kia Optima

10/16/2010 9:08 PM

Thanks for all your suggestions, I did check the computer codes, and the only one to came up is:

P0335 Crankshaft position sensor A malfuntion.

I got power going to it, I did check the harness, and I can find anything wrong with wires, is there a way to check the actual sensor to see if it is working properly?

Thanks.

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#5

Re: Kia Optima

10/17/2010 1:00 AM

You will need the use of an Oscilloscope to check it properly. You will need the oscilloscope to see if it is sending out pulses during cranking. It is counting teeth on a tone wheel or the fly wheel. However it is a common fault. It is a non repairable item, see if you cant borrow a known good one to see if it is the problem.

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#6
In reply to #5

Re: Kia Optima

10/17/2010 10:22 PM

GA. If the ECM does not know the speed the engine is turning, it can't know when to fire the injectors.

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