This is for Nissan Data Scan/Consult/Blazt Users!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

caall99 · 06-06-2006, 12:58 AM

Basically I have a question pertaining to TPS and Injector voltage, on a S13 SR20DET Blacktop. Using "Data Display" in Nissan Data Scan 1.51, I can see that my TPS voltage is setup perfectly from .46 to 4.20 volts (closed to open). But I am also noticing that my injector voltage is fluctuating from about 5.xx volts to 9.xx volts proportional to my throttle input when the car is off and the key is on "Acc". With the engine still not running and accessories on, when I slam down the throttle the voltage for the injectors pops up to about 9 volts. On the other hand, when I slowly ease the pedal down, it barely creeps the Injector voltage up from 5 volts. Also when I hold the pedal at full throttle the injector voltage slowly trickles back down to 5.xx volts from whatever it popped up to.

My feelings are that I have a short between one of the TPS wires and injector wires (do to physical damage and water, from cleaning the engine bay), causing the injectors to receive a voltage signal from the TPS. This could be messing up my A/F ratio, and I do notice some weird power delivery occasionally.

My question: should there be proportional to throttle position voltage be going to the injectors when the engine is not running? especially inconsistent voltage?

The reason I am asking CONSULT (or derivatives thereof) owners to answer my question, is because it is easiest for them to see these voltages in action. Please let me know, this has been going on for a while and I need to figure out if this is normal or not.

Thanks

caall99 · 06-06-2006, 04:51 PM

oh come on, i know someone has this software/hardware running, and could tell me their voltage readings. please let me know soon, i need to drive 200 miles with my car this weekend.

caall99 · 06-07-2006, 07:24 AM

ok, bumping it again, this is the last time and then i will cry if no one responds. i feel like i am talking to myself here. Oh, i discovered its not injector voltage i am looking at it is "time", namely milliseconds, but i don't know if that makes a difference.

JohnC · 06-07-2006, 08:50 AM

I heard your call, (better late ......)
I will check all this for you tomorrow
once I get back home.
OK?

update, I will check log files I have with the log analyzer on
my laptop.
be back in a few.

JohnC · 06-07-2006, 08:58 AM

Well I can not really help you with the log files I have

They are all with the car running. Guess you will have to wait
tìll tomorrow after all.

mjjstang · 06-07-2006, 02:07 PM

hmm too tired right now, but maybe later i cna check if ytou get no reslultsz. oloook i cant even type im so tired. maybe tomarrow mroning ill hve time to check.

caall99 · 06-07-2006, 05:58 PM

cool! thanks guys, let me know

JohnC · 06-07-2006, 10:25 PM

Had a friend have a look on his car with his consult and he
got the same results. He was not expecting ti see that but
he did. I guess I will be seeing the same later today.

John

caall99 · 06-08-2006, 07:55 AM

john, did u get the same readings with your engine off aswell?

JohnC · 06-08-2006, 08:02 AM

Hi,

I just got back home.
Give me a couple of hours and I will let you know.

JohnC · 06-08-2006, 09:38 AM

checked my car, does the same thing exactly.

caall99 · 06-08-2006, 11:26 AM

great! so my car isn't messed up, thats good news and puts my mind at ease. thanks man!

JohnC · 06-08-2006, 11:34 AM

u r welcome

06-06-2006, 12:58 AM	#1
caall99 Zilvia Member Join Date: Apr 2005 Location: Wellesley, MA Age: 40 Posts: 267 Trader Rating: (0) Feedback Score: 0 reviews	This is for Nissan Data Scan/Consult/Blazt Users!! Basically I have a question pertaining to TPS and Injector voltage, on a S13 SR20DET Blacktop. Using "Data Display" in Nissan Data Scan 1.51, I can see that my TPS voltage is setup perfectly from .46 to 4.20 volts (closed to open). But I am also noticing that my injector voltage is fluctuating from about 5.xx volts to 9.xx volts proportional to my throttle input when the car is off and the key is on "Acc". With the engine still not running and accessories on, when I slam down the throttle the voltage for the injectors pops up to about 9 volts. On the other hand, when I slowly ease the pedal down, it barely creeps the Injector voltage up from 5 volts. Also when I hold the pedal at full throttle the injector voltage slowly trickles back down to 5.xx volts from whatever it popped up to. My feelings are that I have a short between one of the TPS wires and injector wires (do to physical damage and water, from cleaning the engine bay), causing the injectors to receive a voltage signal from the TPS. This could be messing up my A/F ratio, and I do notice some weird power delivery occasionally. My question: should there be proportional to throttle position voltage be going to the injectors when the engine is not running? especially inconsistent voltage? The reason I am asking CONSULT (or derivatives thereof) owners to answer my question, is because it is easiest for them to see these voltages in action. Please let me know, this has been going on for a while and I need to figure out if this is normal or not. Thanks __________________ Signature over limits http://www.zilvia.net/f/showthread.php?t=21036

06-06-2006, 04:51 PM	#2
caall99 Zilvia Member Join Date: Apr 2005 Location: Wellesley, MA Age: 40 Posts: 267 Trader Rating: (0) Feedback Score: 0 reviews	oh come on, i know someone has this software/hardware running, and could tell me their voltage readings. please let me know soon, i need to drive 200 miles with my car this weekend. __________________ Signature over limits http://www.zilvia.net/f/showthread.php?t=21036

06-07-2006, 07:24 AM	#3
caall99 Zilvia Member Join Date: Apr 2005 Location: Wellesley, MA Age: 40 Posts: 267 Trader Rating: (0) Feedback Score: 0 reviews	ok, bumping it again, this is the last time and then i will cry if no one responds. i feel like i am talking to myself here. Oh, i discovered its not injector voltage i am looking at it is "time", namely milliseconds, but i don't know if that makes a difference. __________________ Signature over limits http://www.zilvia.net/f/showthread.php?t=21036

06-07-2006, 08:50 AM	#4
JohnC Zilvia Junkie Join Date: Mar 2005 Location: Israel Posts: 335 Trader Rating: (0) Rides Gallery: JohnC Feedback Score: 0 reviews	I heard your call, (better late ......) I will check all this for you tomorrow once I get back home. OK? update, I will check log files I have with the log analyzer on my laptop. be back in a few. __________________ JY Racing LTD.

06-07-2006, 08:58 AM	#5
JohnC Zilvia Junkie Join Date: Mar 2005 Location: Israel Posts: 335 Trader Rating: (0) Rides Gallery: JohnC Feedback Score: 0 reviews	Well I can not really help you with the log files I have They are all with the car running. Guess you will have to wait tìll tomorrow after all. __________________ JY Racing LTD.

06-07-2006, 02:07 PM	#6
mjjstang Post Whore! Join Date: Apr 2003 Location: Michigan Posts: 2,654 Trader Rating: (5) Feedback Score: 5 reviews	hmm too tired right now, but maybe later i cna check if ytou get no reslultsz. oloook i cant even type im so tired. maybe tomarrow mroning ill hve time to check. __________________ I was going to, but I can not think of a sig less than 75 characters.

06-07-2006, 05:58 PM	#7
caall99 Zilvia Member Join Date: Apr 2005 Location: Wellesley, MA Age: 40 Posts: 267 Trader Rating: (0) Feedback Score: 0 reviews	cool! thanks guys, let me know __________________ Signature over limits http://www.zilvia.net/f/showthread.php?t=21036

06-07-2006, 10:25 PM	#8
JohnC Zilvia Junkie Join Date: Mar 2005 Location: Israel Posts: 335 Trader Rating: (0) Rides Gallery: JohnC Feedback Score: 0 reviews	Had a friend have a look on his car with his consult and he got the same results. He was not expecting ti see that but he did. I guess I will be seeing the same later today. John __________________ JY Racing LTD.

06-08-2006, 07:55 AM	#9
caall99 Zilvia Member Join Date: Apr 2005 Location: Wellesley, MA Age: 40 Posts: 267 Trader Rating: (0) Feedback Score: 0 reviews	john, did u get the same readings with your engine off aswell? __________________ Signature over limits http://www.zilvia.net/f/showthread.php?t=21036

06-08-2006, 08:02 AM	#10
JohnC Zilvia Junkie Join Date: Mar 2005 Location: Israel Posts: 335 Trader Rating: (0) Rides Gallery: JohnC Feedback Score: 0 reviews	Hi, I just got back home. Give me a couple of hours and I will let you know. __________________ JY Racing LTD.

06-08-2006, 09:38 AM	#11
JohnC Zilvia Junkie Join Date: Mar 2005 Location: Israel Posts: 335 Trader Rating: (0) Rides Gallery: JohnC Feedback Score: 0 reviews	checked my car, does the same thing exactly. __________________ JY Racing LTD.

06-08-2006, 11:26 AM	#12
caall99 Zilvia Member Join Date: Apr 2005 Location: Wellesley, MA Age: 40 Posts: 267 Trader Rating: (0) Feedback Score: 0 reviews	great! so my car isn't messed up, thats good news and puts my mind at ease. thanks man! __________________ Signature over limits http://www.zilvia.net/f/showthread.php?t=21036

06-08-2006, 11:34 AM	#13
JohnC Zilvia Junkie Join Date: Mar 2005 Location: Israel Posts: 335 Trader Rating: (0) Rides Gallery: JohnC Feedback Score: 0 reviews	u r welcome __________________ JY Racing LTD.