I got a PCM 0340 (Camshaft Position Sensor Circuit) error code on my STS 1998. Today I replaced the Camshaft Position sensor and Ignition Controle Module but still got PCM 0340 error. The car starts and runs fine. To continue check wirings I need help to locate:

1. PCM connector C2 and terminal 4.
2. Curcuits 630, 632 and 633.

Great if someone have drawings or photos. I got a service manual but haven't found these places.

 

The camshaft sensor is easy and the computer doesn't need to be flashed. Before changing it, check all the wiring as best you cn from sensor all the way round to the back of the engine. A couple of us (including me) have had the wiring harness burnt or torn that caused the same error.

 

I have measured the cable from Camshaft Position Sensor to ICM and had full ohm and 0.6 volt AC at idle and 1.0 volt at about 1500 rpm. Manual says 1-4 volt, perhaps a bit low volt? Then driving at more than 1600 rpm and reset the error code it doesn’t appear until I slow down to 1600 or less. Any idea? I will take a closer look at the wiring from CPS to ICM.