dr_whigham

Any ideas on what could be causing this code? It's a P0332, for rear knock sensor, low voltage. I got this after installing new Pfadt Headers and intake manifold seals.

Got around to removing the intake, and installed a new harness and two new Delco sensors. First startup and run was fine. Second startup and the CEL came back on; again, P0332.

It's ways the second startup the light and code comes back.

Is this actually detecting KNOCK, or is it a voltage issue? Everything is brand new. I'm stumped.

neutron82

did you clear the code after you put in the new parts?... are the headers rubbing anywhere that could cause increased vibration which could give a false knock reading?... are they touching or near any wiring that could have damaged something?... you might also have the tune checked to see if they missed something by accident

dr_whigham

Cleared the code before startup

Headers aren't touching anywhere that I can tell, but it's a low voltage code. Is that itself knock?

I haven't checked continuity yet for the pigtail to PCM Pin, but that's on the list.

Geoff at EPS tuned it, we were aware of it, but it never came back on the dyno.

martysauto

Disconnect the jumper harness. Measure resistance from battery's ground to sensor side of harness (jumper harness). It should read between 93k and 107k ohms on each sensor. If one is out of range you have a bad sensor or connection at sensor. You may have gotten a bad sensor. If it was dropped it won't work.

dr_whigham

There's a new one in the mail from the supplier. Let's hope it works...

dr_whigham

Final update:

Finally fixed my KS issue. Wasn't anything knock related. Had a damn cut wire at the back of the KS plug, body harness side.

OHM'd the sensors and they were both 99.3 and 99.4 respectively.

Quick trip to eBay and 10.99 shipped later, got a new pigtail and soldered it in.

No more code (P0332) and no more timing retard.

Jurgen1

That would do it . Looks like it might have been rubbing on something unless it was done by vibration but who knows .

neutron82

glad you found it!... that's funny I did pretty much the same thing but to my opsu wire when I had my intake off not too long ago