1998 Kia Sephia code P0343: Tried new Cam Position Sensor (Phase sensor), with key in "run" (engine not running): red wire 12V, Yellow...

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Customer

1998 Kia Sephia code P0343: Tried new Cam Position Sensor (Phase sensor), with key in "run" (engine not running): red wire 12V, Yellow wire 5V to Battery neg post, spark plugs look good, air filter new, reset computer by removing Bat+ > this allowed me to drive car for 15min with no code but engine had no power at upper RPMs. After setting overnight "343" is back. Help please ASAP as this is my grand-daughter car in Livermore, CA and she needs to get back to LA

Last updated
Relly De Jesus
Kia Mechanic

Hello and welcome to ExpertHelp.com! My name is Relly De Jesus and I'm going to do everything in my power to answer your question to your full satisfaction!

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Last updated
Customer

Relly,

I am ready to chat . . .

Tom

Posted
Relly De Jesus
Kia Mechanic

Hello Tom

How are you doing? May I ask if you have a good battery? Sometimes and in some models, low battery voltage or a weak starter can trigger a Camshaft Position Sensor code.

Relly

Posted
Customer

Bat is 18mths old, fuel filter 2.5yrs old . . . Bat is strong in starting engine, which is not a problem . . .

Posted
Relly De Jesus
Kia Mechanic

Thank you for that information Tom. The PO343 should have been resolved after replacing the Camshaft position sensor. Is there any yard near you? I am suspecting that the ECM is failing. It may not be communicating with the sensor that's why  this issue occur. 

ECM

It's usually the fault we experience in our shop when we keep on replacing parts and sensors but the same issue occur. This will cost $60 on ebay or can be cheaper in the yard. 

Relly

 

 

Posted
Relly De Jesus
Kia Mechanic

Notes

- Chat and called Tom

- Discussed what's causing the issue and possible ECM replacement must be done to resolve the problem

- Agreed that it can be the ECM

- Call ended

Posted
Customer

Relly,

Reading the Haynes repair manual, my fears seem to be true. That is, replacing the PCM has security issues such that the car will not start untill the dealer reprograms it. Is this true? If so is there a work-around, permanent or enough to drive it across town (10mi) to the dealer? I have ordered a used one from Sacramento to be delivered on Friday sometime. --- Tom

Posted
Relly De Jesus
Kia Mechanic

Hello Tom

Good to hear back from you. I don't think that you will need to reprogram the ECM on this model Tom. It's the newer models that will require one. 

Relly

 

Posted
Customer

Relly,

PCMsat on their counter all day and did not ship. So they are shipping overnight at their expense. Should have by late morning Sat.

--- Tom

Posted
Relly De Jesus
Kia Mechanic

Hi Tom

Good to hear that.  Lets just wait. Have a good one!

Relly

Posted
Customer

Relly,

Well the new used PCM did not fix it. I left Pos Bat off while changing and after starting took it off again for 3+ min with the same bad results.  How much does the exhaust back pressure play into this? --- Tom

 

Posted
Relly De Jesus
Kia Mechanic

Hi Tom

Good to hear back from you. There must be something else that's causing this issue. Are you getting code P0470? If the back pressure sensor is failing the problem may evolve into a crank-no start too. But will it run when you try a battery reset?

Posted
Customer

Relly,

Late Saturday I replaced the crank sensor as it had slightly melted on the end with some plastic build up across the detector. I removed the Neg Bat to reset the PCM but no change. So, new crank sensor, cam sensor, and new/used PCM I am stopped on what next. What role would a bad catylitic converter have on this, Blocked? No restriction (no back presure)? --- Tom

Posted
Relly De Jesus
Kia Mechanic

Hi Tom

I don't think that a bad catalytic converter will be the issue. There must be something else causing this issue. Try cleaning up the connectors on every sensor. If you can just use an updated scanner to know if there's any sensors causing this issue. 

Relly

Posted
Customer

Relly,

On Cam sensor 12v, 5v, and Gnd are good as is the engine ground. The owner has decided to scrap the car. Fustrated as this was not my better moment in auto repair over my life since building hot rods in high school.  Thanks for you help. --- Tom

P.S. I accepted your answer but selected "not fixed, yet." hope you still get paid, as you tried.

Posted
Relly De Jesus
Kia Mechanic

Hi Tom... I just wish that there was an easier fixed on this one. I greatly appreciate it. Have a good one!

Relly

Posted
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