My '95 Saturn SL1 (EFI/OHC) "check engine" light is on. It is reading code 26,
which is the quad drive.
I have tested the EVAP canister purge sensor, it reads good (42 ohms); the
coolant fan relay, it reads good (80 ohms) and the A/C relay also reads
good (82 ohms). I could not check the EGR solenoid ( I dont know where it
is located), but I believe if it was not good I would have a code 32 along
with code 26. but I have code 26 only. All the hoses that go from purge solenoid to the intake or to the canister seem to be ok. what else could be wrong?

Thanks in advance.

http://www.differentracing.com/tech_articles/dtc/26.html

your EGR is electric, not vacuum, so you have no EGR solenoid

Ok. I didn't know.
To follow the step by step of the differentracing.com, I I need to know where is the PCM located?

its under the dash near the drivers left foot, the ABS module is also right next to it.