OK here's the problem i'm having on my 99 Civic Si:

Speed sensor, VTEC, back up lights and radiator fan are not working. I do get speed readings when datalogging with the Hondata. Anyways, i noticed that the wiring for this 4 sensors comes from the same area in the main engine harness. This what i've done so far to try to find the problem but so far, no luck...

1- Looked for any possible kinks or cuts on the harness and found nothing.

2- Double check all sensor connections and everything it's on the right place.

3- Checked with a meter for continouity (spell check) between this sensors and the ECU harness and everything checks ok.

4- Checked all fuses and relays and everything it's good.

Question is, what should i check next? Is there anything else i can check before having to go into the engine harness itself? It almost seems like this is a ground issue or something very simple that is going to be a pain in the rear to figure out.

Any input is greatly appreciated...

 

Also, i never had a problem with any of these sensors. It all started after reinstalling my cylinder head which was sent out to alaniz for some work.

 

just triple check the ground connections and no luck...