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Check engine codes

Tiny
CRONE
  • MEMBER
  • 2002 HYUNDAI SONATA
  • 6 CYL
  • AUTOMATIC
  • 113,000 MILES
My 2002 Sonata was idling rough. I changed the iac valve and now then the spark plugs. I have codes p1505, p1507, p0122 it is a v6. I really need help cannot keep throwing money at it. Recently changed timing belt and water whatever too.
Sunday, March 27th, 2011 AT 6:44 PM

16 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
P0122 = Throttle Position Sensor Circuit low input...
P1505 = Idle Charge Actuator Signal Low of coil # 1...
P1507 = Idle Charge Actuator Signal Low of coil # 1...

It is a problem with the TPS and IAC, but since IAC had been replaced and CL still indicates a fault with it, I would suggest cheking the wire harness and connections from IAC/TPS to the PCM. It could also be a faulty PCM.
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Sunday, March 27th, 2011 AT 7:16 PM
Tiny
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Okay, here is the thing changing them the wires were taken off and put back on in the order that they came. Looking in the book, we have the firing order wrong. Can that cause this? Even though we took them off and replaced them one at a time? Also, we changed plugs and wires because it was already idling erratically. Now it is just high not erratic. The book says 135 in the back 246 in the front and that they should go from front to back, 142536. However online, I found that 3 and 6 were reversed? Thank.S
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Sunday, March 27th, 2011 AT 7:34 PM
Tiny
KHLOW2008
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Basically for V-6 cylinder line-up, you look at engine from the pulley side and the side on your left is (left bank) is 1, 3 and 5. Firing order is 123456 so reversing 3 and 6 does not matter as they uses the same coil which fires both wires at the same time. If you want to get it correct, just swap the wire at the coil.

Ensure the throttle body is installed correctly with no restriction to the throttle plate. If it is not closing correctly, it can cause the high idling. Since a TPS fault code had been detected, that is where I would suggest starting from.
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Sunday, March 27th, 2011 AT 7:57 PM
Tiny
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Thank you. I am certain to have more questions. We put the firing order as is in the book. Glad it doesn't matter as long as it's on the same coil pack. We are not used to these detailed model cars. Our others are mid to late 1990's Honda's! But, I so want my Sonata to run right. It is new to us! Thanks for you help, my husband is trying to figure it out without spending more money!
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Sunday, March 27th, 2011 AT 8:09 PM
Tiny
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  • 16 POSTS
The idle is at 1500 between the 1 and the 2 and sometimes goes up just a bit or down just a bit. With air conditioner on it drops to 1000 or in drive. But park and neutral are high. Any more ideas?
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Sunday, March 27th, 2011 AT 8:38 PM
Tiny
CRONE
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  • 16 POSTS
I finally drove it myself and it does not shift right it goes up to 3000 rpm's and might choose to shift. I stop it there. It cannot be driven anywhere, but around the block. All of this after spark plug and wires?
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Sunday, March 27th, 2011 AT 9:52 PM
Tiny
CRONE
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Changed the TPS any other suggestions?
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Sunday, March 27th, 2011 AT 11:48 PM
Tiny
KHLOW2008
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Recheck if the TPS and IAC wire couplers had been interchanged.
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Monday, March 28th, 2011 AT 1:16 PM
Tiny
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Finally broke down and took it somewhere. That is exactly what happened. Now, here is my question. It is driving okay, but still a little higher and shifting harder than normal. The mechanic said to drive it about 20-25 miles for computer to reset itself. At that point, if it is going to change will it? It still is high, but not nearly as bad as limp mode. He also said we may have fried the new TPS, so it may need another one if a light comes back on. Your two cents? I just hope the idle goes down about 200 and the shifting gets smoother. It does not shift until about 3-4000 in between. Again your thoughts are graciously appreciated.
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Tuesday, March 29th, 2011 AT 1:02 AM
Tiny
KHLOW2008
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Is the check engine light still indicating? If trouble codes are indicating a TPS problem, it is not going to reset itself. Usually when computer relearns, the idling speed would be low instead of high. Did you check if the TPS and IAC wire connectors had been wrongly interchanged? They are rather close to each other and is possible to be wrongly installed.
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+1
Tuesday, March 29th, 2011 AT 11:53 AM
Tiny
CRONE
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There are not any codes and the light is off. Well, the mechanic said there are not any codes. But the light is off. Just wondering if we fried the TPS from wiring it wrong. The idle is still high. Husband drove in on freeway less than 20 miles total, but it is still higher than it should be.
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Tuesday, March 29th, 2011 AT 12:13 PM
Tiny
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So the light came back on. Took it back to shop they have decided they cannot fix it. The idle is high still and the light is on. The errors indicate the TPS, but it is been changed and the transmission sensor now? What in the world is going on? Also, have appointment with the dealer tomorrow. I just did not want to go that route as money is next to none. Especially after all the repair bills for nothing thus far. Help! I will post the problems and solutions when I know so others have that. I notice that once people post, it is seldom that they respond with a have a fix. If you know of anything else before I waste the rest of my money please let me know. I am a very poor teacher!
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Wednesday, March 30th, 2011 AT 12:29 AM
Tiny
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Yes, they were interchanged, but since fixing we are having the above problem. The mechanic said it needs to go to a dealer:( I am taking it to run diagnostic, but I am running low on funds for this thing. Any other suggestions? If they were wired wrong (interchanged TPS and IAC), can it again fry both? Thanks
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Wednesday, March 30th, 2011 AT 2:54 AM
Tiny
KHLOW2008
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Not likely to be so. Changing back the connectors should get it back running. Most likely the TPS is out of specs or not installed correctly.

Was the TPS replaced with new or used? Recheck its installation, it has to be seated correctly.

Recheck any ground wires that was removed while performing spark plugs replacement. One of it is on the firewall. Any bad grounding circuits can cause intermittent faults codes to be triggerred.

IAC wires are ORANGE/BLACK, PINK and BLUE.
TPS wires are LIGHT BLUE/BLACK, BLUE and BLACK/ORANGE.
MAP sensor are LIGHT BLUE/BLACK, BROWN and BLACK/ORANGE.

Ensure they are in the correct position. Check the connectors for signs of contamination and corrosion.

Perform the following TPS functional check to see if it is functioning correctly.

1. Turn ignition off. Disconnect TP sensor 3-pin harness connector. Measure resistance between TP sensor connector terminals No. 1 and 2 (component side). Standard resistance value should be 3500-6500 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace TP sensor.

2. Measure resistance between TP sensor connector terminals No. 2 and 3 (component side). Open throttle valve slowly from idle position to wide-open throttle position. Resistance should change smoothly in proportion to the throttle valve angle. If resistance changes as specified, go to next step. If resistance does not change as specified, replace TP sensor.

3. Reconnect TP sensor harness connector. Connect scan tool to Data Link Connector (DLC). Turn ignition on and monitor for TP sensor PID value. Voltage should be 0.25-0.80 volts at idle position and 4.25-4.70 volts at wide open throttle. If voltage is not as specified, replace TP sensor.

Interchanging the wires should not cause the TPS to be fried, the PCM is more likely to be fried instead.
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Wednesday, March 30th, 2011 AT 9:56 PM
Tiny
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Thank you for all of your knowledge. Took it to dealer and $230.00 later, they changed the TPS again and all is good. Maybe it was the aftermarket part? In any case, you were right on we are just not inclined or patient enough to figure it out. Thank you so much. If anyone else has this problem, but a Hyundai part! It is easy to install. Thanks again.
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Thursday, March 31st, 2011 AT 12:13 AM
Tiny
KHLOW2008
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You are welcome.

Glad to know you have fixed the problem.

Have a nice day.
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Thursday, March 31st, 2011 AT 12:24 AM

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