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Old 01-09-2007, 01:30 AM   #1
ihaveanose1234
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Default CEL question/issue

Ok this is kind of weird but here goes. I ordered a turboback last week and I was supposed to go pick up and uppipe tommorow but when I got under my car tonight to start disassembling the car I find out the previous owner had already installed an uppipe.

I was excited at first because that saves me the hassle of doing the install, but then I got started thinking, why is there no check engine light? I was assuming he had done the 2.2k ohm resistor fix, but I go check and the connectors are still plugged together for the EGT sensor.

So I unplug the two connectors and start pulling the male end out and find that the EGT sensor had just been cut off. And obviously no resistor. So I'm wondering why I don't have a check engine light so I start looking around and I find this under my dash on the driver side......



Those two green connectors were not connected, so I connect them and start up the car. I get a flashing check engine light. I turn the car off go plug the resistor into the female end connector and disconnect the negative battery terminal and press the brake pedal down to bleed the car of any charge to reset the ecu.

Start the car back up and I immeadiatley have a flashing check engine light. I turn the car back off and disconnect the green connectors again and start the car and the check engine light is no longer on. I'm going to plug the connectors back together tommorow and go get the codes checked. But I'm wondering what this green connecter is and why it makes the check engine light not appear to be on.

I have had the car now for about eight months and have not had any problems with it so I'm assuming the check engine code isn't that bad.
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Old 01-09-2007, 01:42 AM   #2
boozy04
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those are the test mode connectors. they are supposed to be unplugged. they will cause the check engine light to flash, and if you just turn the ignition on you will hear the fans cycling. unplug them and you'll be fine.
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Old 01-09-2007, 03:58 AM   #3
Gethin
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Maybe you have a ECU reflash? If there is no EGT resistor fix then you shuould get a CEL in theory, unless the ECU has been reflashed or there's a UTEC in there disabling all CEL's.

The green connectors are supposed to be disconnected. They are diagnostic connectors.
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Old 01-09-2007, 09:35 AM   #4
ihaveanose1234
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Ok didn't know that, and I have no idea about engine managment. I bought the car from a Toyota dealership and they said it had been put back to stock. So are there any other ways other than the resistor fix to fix a CEL from being thrown with no resistor?
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Old 01-09-2007, 05:34 PM   #5
ihaveanose1234
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Also, I dont know if this helps shed any light on the situation, but I've always noticed that my seatbelt light never stays on even when my seatbelt is off. I don't know if the cel not being on and the seatbelt light never coming on have something to do with eachother but I just thought I would bring that up.
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Old 01-09-2007, 05:40 PM   #6
Mustang Raper
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Quote:
Originally Posted by ihaveanose1234 View Post
Ok didn't know that, and I have no idea about engine managment. I bought the car from a Toyota dealership and they said it had been put back to stock. So are there any other ways other than the resistor fix to fix a CEL from being thrown with no resistor?
Other than that fix and engine managment? I dont think so.
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