Do you know of a write-up detailing this? Been searching for a while and all I see is people saying it is the way to go, but can't find much info on how to do it.
EGR is going to be the death of me...save me! (1 Viewer)
- Thread starter LX450inNash
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Unplug the EGR temp sensor and plug in a 4.7 kohm resistor into the plug (on the wiring harness side). Cover with electrical tape and no more CEL. Get a 5 pack from radio shack so if you bend or break one there's some extras.
Also cap off the vacuum lines to the EGR valve and EGR modulator.
Also cap off the vacuum lines to the EGR valve and EGR modulator.
thank you sir!
so I wired up the 4.7 to the temp sensor side of the plug like so (the red circle is the resistor in heat shrink)
lumbee1
Native American
I have a 1995 and use this with the Torque app on my smart phone.
Amazon.com: BAFX Products 34t5 Bluetooth OBDII Scan Tool for Android Devices: Automotive
I can pull codes, clear codes, and monitor vitals.
Amazon.com: BAFX Products 34t5 Bluetooth OBDII Scan Tool for Android Devices: Automotive
I can pull codes, clear codes, and monitor vitals.
Be sure the resistor is on the wiring harness side of the plug (you shouldn't be able to pull it out of the engine bay).
Do u have a picture? I used a code reader to clear the code and it still popped at 37 miles
lumbee1
Native American
I pulled the temp sensor from the intake and the plug. I cut the wires off the sensor and put it back in the intake. I disassembled the plug, cut off as much of the wires as I could, and soldered the resistor to the leads. I reassembled the plug (picture) and covered the resistor in hot glue.
Is it possible that a 4.7 ohm resistor would work in one OBD II but not another one?
This may sound like a stupid question but my resistor is a different color and stripes. Is that because I bought the wrong kind or is that irrelevant?I pulled the temp sensor from the intake and the plug. I cut the wires off the sensor and put it back in the intake. I disassembled the plug, cut off as much of the wires as I could, and soldered the resistor to the leads. I reassembled the plug (picture) and covered the resistor in hot glue.
lumbee1
Native American
My resistor is a 4.7K Ohm 1/2 watt resistor. I also have 4.7K Ohm 1/8 watt resistor that is very small and tan.
So the one I have is a 1/4 watt resistor. Do you think that's what my problem may be?
ppc
M Go Blue
Make sure the resistor is 4.7K yellow, violet, red There is no 4.7 ohm made just 47 470 4.7K etc.
In this application the 1/4 watt should be sufficient.
In this application the 1/4 watt should be sufficient.
I am now at a total loss. I have tried two different brands of resistors. I have tried two different methods of putting the resistor on the connection and am still getting CEL. Unless i am using the wrong connection on the wiring harness i have no idea where to go next. I ultimately plan on finding the real root of the problem and fixing it but i have to pass emissions by next sunday.
sbman
Supporting Vendor
The CEL is throwing because the ECU is attempting to do a self test on the EGR system and is not seeing the expected values on the 'temp sensor' that is now a fixed resistor. There's another thread somewhere that talks about how to get past this with a relay wired up to give the expected response. You'll need to do that every time the ECU is reset, or codes are cleared.
so im missing a step? I have been clearing the code with a reader then applying resistor and getting about 45 miles. I only need 60-70 miles to pass the readiness on the emissions test
sbman
Supporting Vendor
Yes you are missing something. The computer will cycle the EGR valve and look for the temp to change, checking 'off' = low temp and 'on' = high temp. With the resistor mod, you have to have already passed the readiness test or the test will never clear. There's a thread here somewhere that discusses using a relay to have the 'on value' and 'off value' with two resistors and a relay to make the computer see the right values and pass the readiness test.
Thank You! I found the thread you were talking about hopefully this can fix my issue.
lumbee1
Native American
I installed block off plates, installed the resistor, cleared the codes, and I haven't seen a P0401 for 100 miles of driving and 6 to 7 starts.
