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the evo does not detect the data

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hi i have an evo one thats installed in a 2004 tahoe. followed guide 61101 and when trying to program the immobilizer bypass the blue light turns off and nothing else happens once the ignition is turned on. triple checked wiring and checked continuity. tried moving the wire to another leg of the bus distribution and that didnt work either.


am i missing some software parameter or something ?



tried software 70.18, 70.40 & 70.38
asked Jul 26 in Chevrolet by joe tom (380 points)

1 Answer

+1 vote
Best answer
You need to have the module on firmware 70.18 for this J-1850 install to program.


Also, I noticed in your other thread/photo you are using t-taps. I suggest removing these and making proper spliced connections. Alot of the times, t-taps are the root of the issue.


You can also try connecting the yellow wire from the 20 pin connector of the evo to the pink wire on the main 6 pin connector. This is the ignition input to the module and is how it knows you turn the key on/off.
answered Jul 27 by Derek (190,250 points)
selected Jul 27 by Robb

yes this worked well. thank you very much for the terrific support Derek. yes