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I have a '99 Toyota Camry V6 5 spd with a persistant
Sent to Car Experts February 25 06:14 PM

I have a '99 Toyota Camry V6 5 spd with a persistant code p0402 and p1411 despite our best efforts to fix the problem. The entire EGR assembly has been removed cleand and replaced with very little build-up in it and the EGR VSV has been replaced at the recommendation of the dealer. The engine performance / mileage gives no indication of a problem so we have just left the light on for the last 2 months. A relative said they had a Toyota that the ECM gave false, persistant codes when there was not a problem. Any ideas?

Customer (name blocked for privacy)
Status:  Closed   Value: $20
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February 28 9:54 AM (2 days and 15 hours later)
         
Relist: No answer yet.
Uh-oh fellas, she asked me if I had an answer for her this morning...I could use some help here! :-) I will raise the offered amount also.
Customer (name blocked for privacy)
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February 28 10:30 AM (36 minutes and 1 second later)
         
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Pictureautodoc_2000 -- Auto Service Technician -- 98% Positive Feedback on 907 Car Accepts
ASE Master Tech w/ Advance Engine Performance
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March 1 1:03 PM (1 day and 2 hours later)
         
Can you give me more detailed instructions on "Backprobe" please. In my guess it would be check the voltage with the engine running on one of the three wires but which one and how do i determine valve open or closed? Can i visually see it switch or can I manually close and open the valve? Thanks for your time.
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March 1 1:14 PM (11 minutes later)
         
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PictureKyle Northrop -- ASE Master Auto Technician -- 100% Positive Feedback on 337 Car Accepts
ASE Master certified tech, L1 cert, CA. Smog License, CNG and Hybrid certified
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March 1 1:18 PM (4 minutes and 1 second later)
         
ACCEPTEDCheck Mark

By back probing I mean to check for voltage with the connector plugged into the egr valve position sensor. Use a volt meter and check between the yellow and brown wires. You should ahve 5 volts. Now use the volt meter and check between the white/green and brown wire. This is the reading you want to take for the test I told you about. You can either pierce the insulation on the wire or slide the test leads into the back of the connector but be careful not to damage the connector. The valve is vacuum operated so with no vacuum applied the valve will be closed and with vacuum applied the valve will be open. I hope I have explained it a little better for you. I apolgize for the first response not giving you enough info. If you have any other questions feel free to ask. Here is a diagram of the circuits.

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Pictureautodoc_2000 -- Auto Service Technician -- 98% Positive Feedback on 907 Car Accepts
ASE Master Tech w/ Advance Engine Performance
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