98Hatchling

I just bought a 98 cx Hatchback. I got the car smogged. It passed. I drove away, moments later, the CEL lit up! So I bought a scanner...

I just got a code on my 98 HB (cx) (all stock) that said O2 Sensor Heater Circuit Malfunction. It was code 135. (or P0135 as the book refers to it)

I replaced the sensor thinking that would do it, but I still get the code, so I'm guessing it is not getting power, but I don't know how to test for that. I looked at the wiring diagram but it didn't make complete sense to me, and I don't know what PCM stands for although I'm assuming it's a computer component or chip that routes power according to programming of some kind.
Another problem I have is that I don't know WHERE to test for the power, where the PCM is, or how much power it should be getting, or which wires are supplying the power.

For the wires supplying power, I think I read a post mentioning that they are the black wires on the sensor are the ones that heat the sensor; this would mean that I test the ones they connect to [on the engine wiring] with a multimeter.

Now, once I figure out which ones are supplying power, I want to know how to solve whatever problem I discover. If it is NOT getting power from the heater ciruit, I need to know what to do next.

Thanks all, and HT!

julio_bOostamante

bump cause im having this problem!