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Roy
Roy, import/domestic specialest
Category: Hyundai
Satisfied Customers: 4820
Experience:  ASE master tech for 40 years
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I am having this same issue with a 2006 hyundai santa fe

Customer Question

I am having this same issue with a 2006 hyundai santa fe 2.7l. Intermittently stays running with the ignition off. First I had rich fuel trim readings and the upstream o2 sensors were not fluctuating. Replaced the MAF and that fixed that problem. I tested the ignition switch by removing the ignition fuse when the symptom occurs and the engine just stays running. Im stumped.
Submitted: 28 days ago.
Category: Hyundai
Expert:  Roy replied 28 days ago.

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

Expert:  Roy replied 28 days ago.

ok, there is an engine control relay in the underhood fuse block. if that relay sticks, it will send a continuous signal to the pcm that the ignition switch is on and the engine needs to run.

try removing the relay to see if it shuts off.

Roy

Customer: replied 28 days ago.
It does shut off when I remove that relat.
Customer: replied 28 days ago.
Relay
Expert:  Roy replied 28 days ago.

ok, first. I would replace that relay and see if that resolves it. if not, then we need to look at the control side controls.

the relay should be available at a parts store and they are cheap to buy.

Roy

Customer: replied 28 days ago.
Ok. I will try that first. Thanks.
Expert:  Roy replied 28 days ago.

your welcome

please dont forget to rate me as it is the only way I get paid for my efforts

Roy

Expert:  Roy replied 28 days ago.

are you there

Customer: replied 28 days ago.
Im here. I can't get the part till tomorrow and Hyundai was the only one that could get it. I will let you know tomorrow.
Expert:  Roy replied 28 days ago.

ok

Customer: replied 27 days ago.
The relay did not fix. Seems to happen mostly when the engine is really warmed up and after reving up the engine a couple of times.
Expert:  Roy replied 27 days ago.

ok, when you pull the relay and it shuts off, does the relay click???

Expert:  Roy replied 27 days ago.

are you there

Customer: replied 27 days ago.
Just finally jad a chance to check that. I did not feel a click no.
Expert:  Roy replied 27 days ago.

do you have an ohm meter to check some wiring???

Customer: replied 27 days ago.
Expert:  Roy replied 27 days ago.

I am wondering here. removing the relay, no click concerns me that there may be a wiring issue.

the relay controls the fuel pump and feeds the pcm. wondering if the pcm is getting voltage it should not get.

also wondering about the ignition switch not cutting voltage as well. if you play with the key, will it shut off??

Customer: replied 27 days ago.
No. But if I tap the gas pedal it will.
Expert:  Roy replied 27 days ago.

thats not good.

either you have a wiring harness issue or a pcm that is internally shorted

let me look further at the wire diagrams

Customer: replied 27 days ago.
I pulled the pcm and took it apart. There were no burn marks or corosion. Nor did it smell burnt.
Customer: replied 27 days ago.
I am working on like 3 cars right now so please be patient with my responses.
Expert:  Roy replied 27 days ago.

you dont need to see it or smell it. it could be as simple as a bad diode.

Roy

Customer: replied 27 days ago.
Gotcha. How can I test that?
Expert:  Roy replied 27 days ago.

thats something that we as techs cannot check. you need special equipment for that. a parts store can send it out to a rebuilder who will check it and confirm if it is good or bad

Roy

Customer: replied 27 days ago.
thats it, huh? Thats all it could be?
Expert:  Roy replied 27 days ago.

I am here and not there. I cannot see it touch it or diag. I rely on your input. we give advice based on your input and our expierence.

as I stated before, either a wiring issue or pcm issue. both of these need to be checked.