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n4ynu1010 · 10-09-2007, 07:24 PM

Here is a link with the codes:
http://www.off-road.com/toyota/tech/codes/

Code 71 for the EGR could be a vacumn leak which is preventing the valve from opening or the switch from working due to a vacumn leak , the switch whether the Temp controlled vacumn switch or the temp controlled electrical switch could be causing the problem as well.
Also if you have the EGR with the Temp Sensor ....that could be bad and not telling the ECM the valve is open .
Could be alot of things depending on the layout which is why you need to use the Service Manual to check operation of these different controls and understand your model year layout and function so you know where to look

.
Here is a 93 FSM online version :
http://personal.utulsa.edu/~nathan-buchanan/93fsm/

scroll down to get to the 3VZE if that is what you have , the 4 banger is first , and then under "engine" and then "emission control" , you will see that over the years several diff. types of control systems have been produced so you have to go through them and find yours and then you can see what controls and or switches what for the system you have , once you do that you can use the FSM to troubleshoot any of the controls whether temp/electrical , temp/vacumn or exhaust temp switched .
The other angle is to remove the EGR altogether which I am going to do on mine soon , then I do not have to worry about the booger anymore .

10-09-2007, 07:24 PM	#7 (permalink)
n4ynu1010 Registered User Join Date: Sep 2007 Location: Richmond , Va / Henrico Co. Posts: 1,065	Egr Here is a link with the codes: http://www.off-road.com/toyota/tech/codes/ Code 71 for the EGR could be a vacumn leak which is preventing the valve from opening or the switch from working due to a vacumn leak , the switch whether the Temp controlled vacumn switch or the temp controlled electrical switch could be causing the problem as well. Also if you have the EGR with the Temp Sensor ....that could be bad and not telling the ECM the valve is open . Could be alot of things depending on the layout which is why you need to use the Service Manual to check operation of these different controls and understand your model year layout and function so you know where to look . Here is a 93 FSM online version : http://personal.utulsa.edu/~nathan-buchanan/93fsm/ scroll down to get to the 3VZE if that is what you have , the 4 banger is first , and then under "engine" and then "emission control" , you will see that over the years several diff. types of control systems have been produced so you have to go through them and find yours and then you can see what controls and or switches what for the system you have , once you do that you can use the FSM to troubleshoot any of the controls whether temp/electrical , temp/vacumn or exhaust temp switched . The other angle is to remove the EGR altogether which I am going to do on mine soon , then I do not have to worry about the booger anymore . __________________ Guy '91 ExCab Dlx Longbed/3VZE-Fast/Stock 2WD/5spd Manual '95 GMC Jimmy SLS 4WD/4.3L Vortech/Euro Susp and Motor Package/Tow Package F.A.I.T.H. Forsaking All I Trust HIM Matthew 19,20 : 19 I say again unto you,that if two of you shall agree on earth as touching anything they shall ask,it shall be done for them of my Father which is in Heaven 20 For where two or three are gathered in my Name,there Am I in the Midst of them Last edited by n4ynu1010; 10-09-2007 at 07:29 PM.