electrical pro needed!!!

[starlet-barry]

hi all i need to know what the resistance margin is on a coolant temp sensor and if it runs by NTC or PTC.and also what the voltage is sent to the throttle position sensor and what is sent back to the ecu when throttle fully open and fully closed aswell. the car is a mk 1 gt btw any help would be much appriciated and rep given cheers , brad

 

[corofin12345]

hi all i need to know what the resistance margin is on a coolant temp sensor and if it runs by NTC or PTC.and also what the voltage is sent to the throttle position sensor and what is sent back to the ecu when throttle fully open and fully closed aswell. the car is a mk 1 gt btw any help would be much appriciated and rep given cheers , brad

www.toyotagtturbo.com/forums/archive/index.php/t-58476

www.toyotagtturbo.com/forums/showthread.php?t=49451

 

[Gtstu]

Ntc lower the resistance higher the temp.the tps is done by resistance if I remember.

 

[starlet-barry]

Ntc lower the resistance higher the temp.the tps is done by resistance if I remember.

lol aite stu i told craig to ask u this but dnt think he did lol iu like ur idea bout the temp senor liein but the throttle pos could be doin same no??? but yeah thats right wat ur sayin bout ntc ptc

 

[dac69er]

the tps is just a switch. open switches one contact, closed switches another. unless you have an auto, then its variable. as for the voltage one the tps, i would assume it would be 12v. i thought it was only the likes of map and maf sensors that worked off a 0-5v scale?

 

[starlet-barry]

www.toyotagtturbo.com/forums/archive/index.php/t-58476

www.toyotagtturbo.com/forums/showthread.php?t=49451

that made things a bit clearer but on the diag wat is the constant feed and wat is the return feed voltage

 

[starlet-barry]

the tps is just a switch. open switches one contact, closed switches another. unless you have an auto, then its variable. as for the voltage one the tps, i would assume it would be 12v. i thought it was only the likes of map and maf sensors that worked off a 0-5v scale?

na u wouldnt get a 12 v feed to any sensor only to a conponent more likly to get about 5v feed to senors

 

[starlet-barry]

na u wouldnt get a 12 v feed to any sensor only to a conponent more likly to get about 5v feed to senors

and i would of thought it would be a "varible" resistor

 

[dac69er]

only on the automatic version. if its a manual it is 100% a switch

 

[Texx]

I'm not sure whether the EP82 uses the 1st or 2nd design of the on-off type TPS, but the first design switches a 12v signal from the ECU to the IDL and PSW terminals and the 2nd design switches the IDL and PSW terminals to ground (IDL and PSW are fed with either 5v or 12v depending on application).

 

[Gtstu]

So could a faulty tps or coolant tempreture sensor cause the car to idle at 2000rpm?

 

[Somhairle]

So could a faulty tps or coolant tempreture sensor cause the car to idle at 2000rpm?

Yep, check them both if you have replacements to hand.

Have you tried adjusting the idle screw?

 

[Gtstu]

Ye tried that with it all the way in it's still at 2k no vac leaks found any where so the tps or coolant temp sensor could cause 2 k idle?

 

[starlet-barry]

I'm not sure whether the EP82 uses the 1st or 2nd design of the on-off type TPS, but the first design switches a 12v signal from the ECU to the IDL and PSW terminals and the 2nd design switches the IDL and PSW terminals to ground (IDL and PSW are fed with either 5v or 12v depending on application).

wats IDL and PSW mean :homer: is it the other two wires that isnt a feed from ecu

 

[Texx]

The IDL (Idle Switch) signal represents closed throttle status and the PSW (Power Switch) represents near wide open throttle demand.

IDL position is between 0° and 1.5°.
PSW position is between 70° and wide open throttle.

Both the IDL and PSW circuits should be open when the throttle position is anywhere between 1.5° and 70°.

 

[starlet-barry]

Ah nice one ^^^