I have a 2000 Chevrolet Astro, I bought it in 2006, and recently a mechanic told that the OBD2 port was missing (not there). I'm guess the previous owner took it out, thinking it was someting that will never be used. I bought the parts to make a new, now i need to install it to the DLC. Which wire on the DLC gets data from the PCM? And does the power wire need to hot all the time or only when the key is in the accessory and/or run position?
SOURCE: p0121 code, 2000 chevy astro
Given that you have replaced the TPS and the PCM, the next step would be to check the connector itself and make sure it is making a good connection and there are no corrosion or anything like that on the connector.
After that, ensure that the TPS has the correct voltage to it, usually its around 5vdc, it should never have full batter voltage to it (12vdc). The PCM usually supplies both the 5vdc reference and the ground for the TPS. Its also entirely possible that (depending on where you bought the TPS) that you were given the wrong one for your vehicle. Not a common thing, but it could happen.
The code will be set if the PCM sees a TPS angle that is not consistent with the RPMs of the engine. If you are having any shifting issues such as hard shifts or the engine having to rev higher to shift, that usually a clear indication there is still something wrong with the TPS circuit even if the TPS itself is good.
Hope this helps.
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