I recently having a problem with check engine light staying on. Before this problem I accidentally wired my wideband to knock sensor to the ecu. I disconnected the wire to the wideband output. Run DTC on ecmlink and not detecting any codes. I had swap out ecu and CAS still having same issue with engine light staying on on every startup. Light cycles though when flip the key on to second position like normal but soon as you start it light stays on with no codes. Anyone experience this car seems to be running fine but can't seem to figure out what happen. Thanks for any help.

In link there’s a “dash” tab, what do you the cel set to?

tk106 said:

In link there’s a “dash” tab, what do you the cel set to?

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Knock CEL set 3 degree
Boost gauge set to knock

Did you hook the knock sensor wire back up? Boost gauge sits at zero? Try disconnecting the knock sensor and see what happens

tk106 said:

Did you hook the knock sensor wire back up? Boost gauge sits at zero? Try disconnecting the knock sensor and see what happens

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Yes boost gauge sits at zero I double check the wires all connected, all I did was tap a wire from knock sensor, even cut the wire and redid the wiring to knock sensor. If I disconnected the knock sensor in the engine bay, i get a knock sensor 1 circuit malfunction code. Reconnect clear codes light still on with no codes

Also try clearing it through link. Looks like pin 36 green/red wire triggers the light when it’s grounded. See if that wire is grounded.

tk106 said:

Also try clearing it through link. Looks like pin 36 green/red wire triggers the light when it’s grounded. See if that wire is grounded.

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I will check that in a few and report back thanks

Updated: check all wiring everything was fine. Started the car and took a few more cranks then normal to start, notice the light blinking and flickering then stay on solid, I went to front of the car and disconnect my coolent temp sensor and check engine light and it was off, shortly after went for a spin, and got a code for coolent temp. Replaced the temp sensor light went away, and got no codes now, just weird because I never had one die out on me without throwing a code. Guess it was dying slowly

Good that you got it figured out. Never heard a cts do that.

Many years ago I had a dying coolant temp sensor not throw a code but cause car to run like crap from it randomly reporting different temps.