Dodgy Tps?

[skidkid]

Was told that TPS was dodgy was causing the idling, gearshift problems & tight steering when backing out driveway. So I had to buy tps through Nissan and after a week it turned up. Fitted last thursday, took car for a drive and was no better. Yesterday I checked tps volts via Apexi AVCR, new verses old and there was no real difference??!! New read 1.13v closed & 3.98v open. Old read closed 1.3v & 3.95v open. Does anybody have any tips so car doesn't have to go mechanic on tuesday?

[chook]

That fault code could have been there for years, it stays in the memory, even it if it detects a glitch for a split second, ie, tps may have been dissconnected during some maintenance in the past thus logging a code. Best way to check is clear codes first and look for codes that appear repeatedly. You may have several problems, cant see how idle problem can be linked to tight steering.

[Al]

If the car is idling weirdly and lower than normal the steering will get tighter as the power steering pump isn't being driven fast enough.

I have an after market ecu and for a long time the car would almost die as i came to a stop, or would actually stall at the lights, more so at night with the headlights on. Blamed my tune for ages and kept getting the tuner to retune the issue, wasn't getting charged for it. After a while he noticed that the tps voltage would intermittently "bounce around", at idle. Replaced the TPS and all fixed, idle is alot more stable too.

Have a look at your tps voltage, while the fault is occuring. See if it is changing by itself, without any throttle input. The sensor could be fine, but the throttle shaft, etc, could be loose/worn, causing false readings.

Could also be an ecu issue.

[wolverine]

pretty sure idle should be around 0.25v to 0.50v

i don't think this will change your issue but worth noting.

[skidkid]

Yer have read those volts needed. Just double checked at computer and had same closed volts as SAFC (1.3v). Just took for a drive. 4wd and check engine light stay on. A/T light flashed 4-5 times on startup. Getting worse!!!

Edited February 8, 2009 by skidkid

[QWK32]

so did you change the TPS position to get the signal voltage down to around 0.3 when closed?

[RS4StagMan]

Need to clear all codes first as Chook said...make sure u get the "55" code which is no malfuncton after reset.

TPS fault code is "43" see if you get this once you have reset your ECU.

If still have the code, from the R34 service manual this is how you set the TPS;

1. Rotate sensor body until you get the specified value on your multimeter (specified value is 4.6V). From memory connect one of the middle pin TPS wires and good engine ground.

Do this with;

a) IGN switch "ON"

b) engine NOT running

c) Accelerator pedal not pressed

The TPS code will trigger when the output voltage is 4.7V or greater (open circuit) or less than 0.3V (short circuit) for predetermined time while park/neutral switch is OFF and speed is 4km/hr or higher.

Give it a go and see how you go. Make sure there are no codes left in system once sorted i.e reset ECU again.

Edited February 8, 2009 by RS4StagMan