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vtec solenoid doesn't have a seperate ground it only has 1 wire that runs back to the ECU. The pressure switch has a separate ground and it was grounded to the thermostat housing. I'll be exploring the possible missing RPM signal to the ecu tonight to see if there's a break in that wire. If that...

Ok checked vss wire and no continuity to ecu. Ran a new wire and vss light goes away. Still no vtec. My next ? Is does the stock tach have any wires that control vtec? Is there a rpm wire that goes to the ecu? I'm using an aftermarket tach and not sure I have any wires running back to the ecu (I...

Gotcha. I'll check it when I get home.

I understand the "sensor" on the tranny is just mechanical and no electrical output from it but if the stock cluster creates a VSS signal which according the the manual is the A2 pin from the back of the gauges, then that signal should route to the VSS input on the ecu. The stock ecu had a VSS...

I'm running OBD1. I was under the impression the jumper harness should have routed the VSS wire coming from the cluster (no2 wire from the 8pin plug) to the appropriate connection on the ECU (B10). I haven't checked the connection yet as I just found the pin locations. Someone please correct me...

I swapped a JDM B16a into my 90 Crx HF. Everything works fine except vtec (imagine that). I've searched and searched and double checked my wiring from the ecu to the solenoid and pressure switch. I'm using a p30 ecu and it's throwing 2 codes. Code 10 (iat temp sensor) and a code 17 (vss). I'm...