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03 hynundai soanta charging system failure
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 12, 2012, 6:04 PM
Post #51 of 71
(6530 views)
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Re: 03 hynundai soanta charging system failure
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The circuit that excites the alternator field is the L circuit grey wire. If you ground that wire with ignition on, the charge lamp should come on. If the lamp is on when you turn the ignition on with the engine is off, the L circuit is good. We checked that circuit in the beginning.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 12, 2012, 6:42 PM)
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djellis
User
Jan 12, 2012, 6:48 PM
Post #52 of 71
(6514 views)
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Re: 03 hynundai soanta charging system failure
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Will check both of these wires tomorrow. Have you heard of a company called AES and they do PCM repairs on the internet...r they okay? If I send this out and they repair it, will it then have to be towed to dealer for rescan or is that just a nasty rumor????? Thanks for all of your help and I will get back to ya tomorrow after we finish these test.....THANK YOU so much for your time and patience
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 12, 2012, 7:05 PM
Post #53 of 71
(6510 views)
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Re: 03 hynundai soanta charging system failure
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I haven't heard of AES, until just now.
Unless they can't repair the bad circuit that concerns the charging system in the PCM, another PCM to be installed will have to be flashed with the program for that specific vehicle. If they can repair the circuit on the board without erasing the EPROM, you just stick it back in the car when you get it back. I am sure they have the capability to do reflashes. Call and find out.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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djellis
User
Jan 13, 2012, 3:55 PM
Post #54 of 71
(6497 views)
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Re: 03 hynundai soanta charging system failure
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I grounded the blue wire and ran the full field test and nothing happened. Revmoved the alternator, went to auto zone, stood and watched the test be run twice and the alternator came back fine both times. Is the bluish wire for sure the wire to be grounded...the one that makes the alternator go full field? NEXT???????????
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 13, 2012, 6:39 PM
Post #55 of 71
(6489 views)
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Re: 03 hynundai soanta charging system failure
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Another possibility is the rotor coil isn't being excited. The rotor has to be excited to basically turn on the alternator. Once the alternator is turned on, the stator supplies voltage to the rotor coil which is grounded by TR3 to control the stator output voltage/current.
The charge lamp acts as a resistor, but may not let enough current to pass through to the rotor to excite it. One thing that you could check is the preexcitation resistor. Remove it from the fuse panel and use an ohm meter to check the resistance. You should only get a resistance reading one way. If you reverse your leads, you should have no continuity (OL or infinite). The diode after the resistor blocks current flow in one direction. I don't know what the resistance is of the resistor, but it should not be open in both directions or shorted.
We do have the same exact car at the shop as yours at this moment, so I may use that one to see what should be what. Its charging system is operational by the way...
The pre excitation resistor is located on the passenger compartment fuse block. It is on the rear side of the block between the door lock relay and tail lamp relay.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 14, 2012, 6:26 PM)
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djellis
User
Jan 14, 2012, 11:14 AM
Post #56 of 71
(6478 views)
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Re: 03 hynundai soanta charging system failure
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Tested the excitation resistor much earlier, same way you expalin and the voltage only read one way and the resistance as well, only one way. I remember that is was like .3 v on one end and 12 v on the other end of the resistor. I don't remember what the resistance was, but it did haved a reading. What wire puts power to the rotor that you are talking about?
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djellis
User
Jan 14, 2012, 2:44 PM
Post #57 of 71
(6473 views)
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Re: 03 hynundai soanta charging system failure
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This is a few different test we have ran.
1. Jumper between battery hot terminal to the alt. stud (no charge 12.5)
2. Jumpered between pre exitation resistor to gray wire at alt. (no charge 12.5)
3. Jumpered blue wire at back of the alt showed full field (not charging 12.5)
4. Installed a different battery thinking a possible short in the battery. Battery still does not charge.
(This post was edited by djellis on Jan 14, 2012, 3:07 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 14, 2012, 4:55 PM
Post #58 of 71
(6463 views)
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Re: 03 hynundai soanta charging system failure
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I'm at work sitting in front of the other Hyundai that is exactly the same as yours. I tested the wiring at the alternator connector with it unplugged and this is what I found.
Key OFF
Bat Lug: 12 volts
Orange: 12 volts
Blue: 0 volts
Grey: 0 volts
Pink: 0 volts
Key ON engine OFF
Bat Lug: 12 volts
Orange: 12 volts
Blue: 0 volts
Grey: 12 volts
Pink: 12 volts
Engine running
Bat Lug 12 volts
Orange: 12 volts
Blue: .5 volts
Grey: 12 volts
Pink: 12 volts
With connector plugged in the blue wire should have around 8 volts
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 14, 2012, 5:21 PM)
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djellis
User
Jan 14, 2012, 5:06 PM
Post #59 of 71
(6459 views)
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Re: 03 hynundai soanta charging system failure
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We had to stop on it for the night and we are going to start back up on it in the morning and run those test. Is there anyway possible that i can email you my number or you email me yours? Would love to talk to you. my email is deleted your link
(This post was edited by Discretesignals on Jan 14, 2012, 5:19 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 14, 2012, 5:19 PM
Post #60 of 71
(6452 views)
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Re: 03 hynundai soanta charging system failure
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See what numbers you get from those tests when you get a chance. Then we'll go from there..
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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djellis
User
Jan 14, 2012, 5:20 PM
Post #61 of 71
(6449 views)
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Re: 03 hynundai soanta charging system failure
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We are going to go ahead and check those realy fast i will get back to you in just a moment
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djellis
User
Jan 14, 2012, 5:34 PM
Post #62 of 71
(6443 views)
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Re: 03 hynundai soanta charging system failure
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OK the results are in.
With the key off
Bat lug: 12 volts
Org: 12 volts
Pnk: 0 volts
Gry: 0 volts
Blue: 0 volts
Key in on postion
Bat lug: 12 volts
Pnk: 0.67 volts
Gry: 1.50 volts
Blue: 0 volts
Engine Running
Bat Lug: 12 volts
Pnk: 0.95 volts
Blue: 0.11 volts
Gry: 11.20 volts
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djellis
User
Jan 14, 2012, 5:40 PM
Post #63 of 71
(6434 views)
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Re: 03 hynundai soanta charging system failure
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we took all those test with the incilation pullend back and conected straight to the wire
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 14, 2012, 5:47 PM
Post #64 of 71
(6434 views)
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Re: 03 hynundai soanta charging system failure
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Something is wrong with the pink and grey circuits. You did make sure that you had the connector unplugged when making these checks?
Might want to recheck your grey with the key on engine off.
Pink should have 12 V with key on engine off and engine running. That comes from the PCM. If there is no voltage there, you'll have to ohm check the pink wire to be sure it is good. If the wire ohm checks good, it's possible the PCM has an internal problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 14, 2012, 5:51 PM)
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djellis
User
Jan 14, 2012, 5:52 PM
Post #65 of 71
(6429 views)
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Re: 03 hynundai soanta charging system failure
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What should the ohmn check be in all the different states?
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 14, 2012, 6:18 PM
Post #66 of 71
(6422 views)
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Re: 03 hynundai soanta charging system failure
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Do not jump the pink wire to battery positive.
You only ohm check the wiring when there is no power on it. You basically have to unplug the connector from the PCM and the connector from the alternator. Then you check for 0 ohms from one end of the wire to the other for the blue and pink wires. Your checking to be sure that there is a path for current to flow from one end of the wire to the other.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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djellis
User
Jan 15, 2012, 12:10 PM
Post #67 of 71
(6409 views)
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Re: 03 hynundai soanta charging system failure
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Found a PCM and it is on its way. Will let you know what happens when it comes in. Estimated shipping 3 - 10 days. Thanks. We'll get back to you soon.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 15, 2012, 12:21 PM
Post #68 of 71
(6407 views)
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Re: 03 hynundai soanta charging system failure
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Crossing fingers... 
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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steverweber
New User
Jul 27, 2012, 6:58 PM
Post #69 of 71
(6351 views)
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Re: 03 hynundai soanta charging system failure
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Im having an issue like this. Wasted a day and got nowhere.
Did the new PCM solve it?
And what did the PCM cost you?
Is there a way to start the alt without the PCM? I want to be sure before I replace another part.
My volts when system running,,
Engine Running
Bat Lug: 11.68 volts
Pnk: 4.38 volts
Gry: 11.20 volts
Orange: 11.12 volts
Blue: 5.5 volts
And another time when i was testing i got somthing like.
Bat Lug: 11.68 volts
Pnk: 4.38 volts
Gry: 1.55 volts
Orange: 11.12 volts
Blue: 5.5 volts
Thanks
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steverweber
New User
Jul 27, 2012, 7:00 PM
Post #70 of 71
(6347 views)
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Re: 03 hynundai soanta charging system failure
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I should add im a 2002 hynundai soanta 2.4L
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 27, 2012, 7:01 PM
Post #71 of 71
(6346 views)
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Re: 03 hynundai soanta charging system failure
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If you have a question, start a new thread of your own. This one is old and someone else is getting notifications.
This one is locked now.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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