Wierd TPS readings - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

b0rdin4life · 02-21-2007, 02:59 PM

I have a S13 SR in an S14 but I wanted cruise control back so I intsalled a KA throttle body and TPS. After I wired the TPS into the SR harness I set the TPS by looking at the SAFC readout of the voltage. The TPS was set right around .48v and was fine for a couple weeks. I went out to my car yesterday and started it and it was revving around 2400-2600 at idle and the SAFC was showing that the TPS was reading 100%. I then checked the voltage readout on the SAFC for the TPS and it was up around 3.8v or so. I shut the car off and reset the TPS to .48v and came inside for the night. I just went back outside to check the car and turned the SAFC on and it was reading 100% throttle again with 3.8v or so at the TPS with the car not even running. Does anyone have any ideas besides a bad TPS?

To wire the TPS i matched the colors on the SR harness to the KA TPS plug and like I said, I had no problems for a couple weeks. Thanks.

UPDATE: I reset the TPS again to .48v and the car started and idled fine so I took it for a test drive. At first everything seemed fixed because the SAFC would show the TPS at .48v at no throttle but then after driving for a few minutes I checked the SAFC again and it was showing the TPS at 1.2v and about 20% when I wasn't on the throttle but if I stayed off the gas for about 30 seconds it would drop to .48-.5v and 0%.

cotbu · 02-21-2007, 04:37 PM

Set the TPS again .45 or whatever then disconnect it, give it some time and see if it still retains the setting

I do have a tps for you if you want it price is 1gal of toluene

b0rdin4life · 02-28-2007, 07:13 PM

What year and motor did the TPS come off of? I assume its in good working condition? Where in DE are you? Thanks!

cotbu · 02-28-2007, 07:38 PM

New Castle, 1993 240sx SE fastback KA24DE
I also used this on the SR20DET, so i removed the pins from the plug already.

After you set the tps, disconnect it for a while, then plug it back in. You may also have a short somewhere.

b0rdin4life · 02-28-2007, 07:58 PM

Would you mind PMing me your number so I can call you about this?

02-21-2007, 02:59 PM	#1
b0rdin4life Leaky Injector Join Date: Apr 2005 Location: maryland Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	Wierd TPS readings I have a S13 SR in an S14 but I wanted cruise control back so I intsalled a KA throttle body and TPS. After I wired the TPS into the SR harness I set the TPS by looking at the SAFC readout of the voltage. The TPS was set right around .48v and was fine for a couple weeks. I went out to my car yesterday and started it and it was revving around 2400-2600 at idle and the SAFC was showing that the TPS was reading 100%. I then checked the voltage readout on the SAFC for the TPS and it was up around 3.8v or so. I shut the car off and reset the TPS to .48v and came inside for the night. I just went back outside to check the car and turned the SAFC on and it was reading 100% throttle again with 3.8v or so at the TPS with the car not even running. Does anyone have any ideas besides a bad TPS? To wire the TPS i matched the colors on the SR harness to the KA TPS plug and like I said, I had no problems for a couple weeks. Thanks. UPDATE: I reset the TPS again to .48v and the car started and idled fine so I took it for a test drive. At first everything seemed fixed because the SAFC would show the TPS at .48v at no throttle but then after driving for a few minutes I checked the SAFC again and it was showing the TPS at 1.2v and about 20% when I wasn't on the throttle but if I stayed off the gas for about 30 seconds it would drop to .48-.5v and 0%.

02-21-2007, 04:37 PM	#2
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Set the TPS again .45 or whatever then disconnect it, give it some time and see if it still retains the setting I do have a tps for you if you want it price is 1gal of toluene __________________ LoverTechnologies "Half Broken Things!"

02-28-2007, 07:38 PM	#4
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	New Castle, 1993 240sx SE fastback KA24DE I also used this on the SR20DET, so i removed the pins from the plug already. After you set the tps, disconnect it for a while, then plug it back in. You may also have a short somewhere. __________________ LoverTechnologies "Half Broken Things!"

02-28-2007, 07:13 PM	#3
b0rdin4life Leaky Injector Join Date: Apr 2005 Location: maryland Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	What year and motor did the TPS come off of? I assume its in good working condition? Where in DE are you? Thanks!

02-28-2007, 07:58 PM	#5
b0rdin4life Leaky Injector Join Date: Apr 2005 Location: maryland Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	Would you mind PMing me your number so I can call you about this?