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There's a boat load of people here that should bring their cars to somebody but they don't. Just look at the daily postings of pure dumb. Not inexperienced, not unfamiliar with cars, but a total lack of common sense or out right stupidity. I ignore most of them but this guy seems helpable...

All you really need is to check IDL to E2 and VTA to E2. IDL to E2 should be around 5 volts with the throttle open and around 0 volts when it's closed. VTA should be between 100-300 mv throttle closed and around 3.5 volts throttle wide open. VTA must not be less than 100 mv or more than 4.8...

It should behave just as I said. With the TPS unplugged idle will be funky and some slight hesitation may be present during acceleration but otherwise you could drive around all day long like that. The 41 and 51 are expected, especially if the TPS is unplugged. You need to do the next 51 check...

Those tests aren't 100% conclusive as far as the TPS goes but they do verify the wiring between it and the ECU. That leaves the TPS itself (either bad or out of adjustment) as the cause. Sounds like the IDL contact alright. The engine idles well because the IDL contact is telling the ECU the...

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=73 The GTE uses Toyota's Type A fuel system. That means 36 psi across the injectors, a value that falls midway between the 33-40 psi specified in the manual...

You didn't say exactly what that means. What problem did you have? Where in the procedure did you see/measure something wrong? You also weren't very clear on what the engine does. Bring the rpm up to 3000 and hold it there. Does the engine cut in and out? If so the IDL contact is remaining...

Assuming the ECU is good (overwhelmingly likely) code 41 can only be set by three conditions: 1) VTA below 100 mv at any TPS position (short in VTA) 2) VTA above 4.8 volts at any TPS position (open in VTA) 3) VTA above 1.5 volts with IDL at 0 volts (IDL switch closed or IDL circuit...

^ Which is exactly why they're not as useless as many claim...

The old sawdust in the motor trick. Thought that died out years ago. Come on, tell us what you paid. I promise not to laugh...

Your journey is likely to end badly but don't despair: with the scanner at least you'll know the fire department is coming...

^ From that link: "Locate wire #1 (red/yellow) It will test at a constant 12volts. leaving enough wire to splice with, cut the wire, and tape off the dash side. Attach a splice / lead to the relay side, and connect it to a wire or fuse that is 12v when the lights are switched on. (I used the...

That would prevent the EGR from working at all. If plumbed correctly there will be vacuum applied to the modulator when there's no 12 volts and no vacuum when there is 12 volts. Put another way EGR operates when the valve is unpowered and the ECU turns the valve on to stop EGR. After...

Notice neither of those mention the coolant sensor as a possible cause. Nor do they tell you the actual parameters. The reason for that is the same as why I don't usually go into them even though I have stuff that puts anything in the TRSM, TWED, or anything else ever posted here to shame...

I only checked the code setting parameters. It may be the VSV is inhibited until 149F is reached but to know for sure I'd have to look at documentation I don't currently have with me. As Jdub said the other sensor references involve inhibiting EGR (via the VSV) above a certain speed, throttle...

Anything that prevents the exhaust stream from reaching the sensor can cause it as can a bad sensor or wiring. There's a lot of leeway in the software though. It allows for up to 4 minutes of sensing and the code is two-trip logic. OP: The coolant sensor doesn't effect operation of the EGR...

Only Cali cars have EGR monitoring. Hmmm. So it does. Standby while I look into that more closely...

Well, if the idle is 1200 the car isn't alright. Who knows what else he did wrong...

It took him half a month to adjust idle to 1200? Lmao. Based on that you need to check *everything* on the car. Or find a better mechanic. Much better...

No.

^ If the AC Amplifier is left installed it will. The signal path is CC head unit > AC Amp > ECU. It's the same signal used for AC idle up...