Stupid EGR i can't ever figure it out!

[Turbo Habanero]

So here's the thing my cra is throwing code 71. It has done this be for due to my ignorence in the Temp sensor not being connected. I fixed that and the code went away for about 2,500 miles.

Tonight on my way home it came back :: angry ::

Everything is connected properly i just dont understand.

One question i do have (exuse my ignorence on this) Could extreme Temp change or humidity increase cause it to act up?

The wheather the past 2 days went from 110F 0-3% humidity to 75F 75-90% humidity.

Also another existing problems on my car is the TPS Sensor is throwing code 41.
I also have hit fuel cut rarely

I was throwing code 24 but i but a different air flow Meter on it from a 87 Turbo about 250miles ago. My car is a Grey Plug 89.

Someone please clue me in. maybe help explain something im overlooking or just not understanding.

Thank-you all in advance
-Jordan

 

[CyFi6]

Code 71 is from either an open in the circuit/sensor or the temp sensor is reading too cool when the egr is commanded on. Weather wont affect it. Either you have an open circuit/sensor or your egr valve is not opening or your passages are blocked.

As for 41 you need to check the sensor and the wiring between the sensor and the computer.

Hope that gives you somewhere to start!

 

[Turbo Habanero]

Code 71 is from either an open in the circuit/sensor or the temp sensor is reading too cool when the egr is commanded on. Weather wont affect it. Either you have an open circuit/sensor or your egr valve is not opening or your passages are blocked.

As for 41 you need to check the sensor and the wiring between the sensor and the computer.

Hope that gives you somewhere to start!

It does. Thankyou.

Sadly wiring is a unknown area for me but ill give it a shot

 

[CyFi6]

Easy check for the EGR wiring..


Unplug your ECU connectors under the dash, put your meter on ohms and put one lead to the THG (black w/ yellow stripe) wire of the harness and the other to E2 (brown) of the harness. You should get a reading, somewhere between 2k and 70k ohms depending on how hot the sensor is when you test it. If you read OL, there is a problem you need to look into further with wiring, if you get a normal reading you need to start checking if the actual valve is opening properly (could be a stuck valve, incorrect vac line routing, vsv issue etc) or if the passages are clogged.

For the TPS, you need to check the sensor itself first (http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=101). If everything looks good, you need to check the wiring, you just need to do a continuity check on each of the 4 pins from the TPS connector to the ECU connector.

 

[jetjock]

Listen to him Jordan. Posts don't get much better than that.

Nicely done Cy...

 

[Turbo Habanero]

Listen to him Jordan. Posts don't get much better than that.

Nicely done Cy...

Yes thank you very much CyFi6. I will get right on this in the morning.

---------- Post added at 02:21 PM ---------- Previous post was at 02:15 PM ----------

For the TPS, you need to check the sensor itself first (http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=101). If everything looks good, you need to check the wiring, you just need to do a continuity check on each of the 4 pins from the TPS connector to the ECU connector.

This part below i don't really get to much. But i still want to thankyou for your help means a lot to me.

you just need to do a continuity check on each of the 4 pins from the TPS connector to the ECU connector.

---------- Post added at 02:26 PM ---------- Previous post was at 02:21 PM ----------

On a side note i Reset my codes to see how long it would take for the EGR code to pop back up yesterday and it has not come back i've gone 147miles and nothing yet.