Will a faulty CYP sensor put the car into limp mode?
05-08-2010, 04:50 PM
#1
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Will a faulty CYP sensor put the car into limp mode?
I have a CEL 9 for my CYP sensor. I've read that there should be no continuity to ground from the pins, and resistance should be 350~700 ohms between the two. I did a quick check and came up with a little over 1,000 ohms, but I need to pull the dizzy to be sure (space is limited to see what i'm doing).
If this sensor has in fact gone **** up, or is headed that way as the CEL says, will my car be in limp mode? ECU is OBD1 P61 (92 GSR)
If this sensor has in fact gone **** up, or is headed that way as the CEL says, will my car be in limp mode? ECU is OBD1 P61 (92 GSR)
05-08-2010, 08:08 PM
#3
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Re: Will a faulty CYP sensor put the car into limp mode?
EDIT: Just found in the FSM that resistance between terminals should be 800 to 1500 ohms, meaning mine is IN spec... hmmm...
05-09-2010, 07:40 PM
#6
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Re: Will a faulty CYP sensor put the car into limp mode?
I got a chance to troubleshoot the issue this morning and found 865 ohms at every test point between the dizzy and the ECU, but still popped a CEL for code 9 when i started her up.
My cam timing was adjusted during dyno tuning a long time ago, but i have made many modifications to the car since then and adjusted it while street tuning on occasion. This afternoon I decided to set it to 0 from its previous 4 degree retard, to see how it affected the powerband. To my disappointment, it didn't do much for the powerband, but to my delight it cleared the CYP CEL!
This is only a week after replacing the short block in the car. Is it possible that my timing belt could be off by a tooth and caused this?? I would like to understand what caused this and how those 4 degrees affected the sensor...
My cam timing was adjusted during dyno tuning a long time ago, but i have made many modifications to the car since then and adjusted it while street tuning on occasion. This afternoon I decided to set it to 0 from its previous 4 degree retard, to see how it affected the powerband. To my disappointment, it didn't do much for the powerband, but to my delight it cleared the CYP CEL!
This is only a week after replacing the short block in the car. Is it possible that my timing belt could be off by a tooth and caused this?? I would like to understand what caused this and how those 4 degrees affected the sensor...
05-09-2010, 10:09 PM
#7
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Re: Will a faulty CYP sensor put the car into limp mode?
Okay, well good to hear you got it "figured out". Yes that resistance reading is in spec for a 2000 Accord ECU, but you said it's a 92 GSR ECU... that ECU was designed to be used with a distributor whose sensors' resistances were in the 350-700 Ohms range. That may or may not have something to do with it or affect it some. Yes it is possible that the timing belt is a tooth off, and thus causing the "adjustment" to have then been even further. Four degrees is a pretty drastic adjustment especially on a single cam. Also since you set it back to zero and you made it sound as though there wasn't a change to the performance then it sounds like it wasn't beneficial anyway.
Well back to you timing belt question: I'd double check the timing since the problem didn't arise until after the bottom end was replaced.
Well back to you timing belt question: I'd double check the timing since the problem didn't arise until after the bottom end was replaced.
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