Hi everyone. I'm having some issues with this turbo build of mine. Recently added turbo and converted obd2 to obd1 running a chipped p06 board. Now I've got no speedometer and my rev is limiting at 5400 approx.
I've checked VSS at trans and am getting 12v, ground and 5v. Also getting pulse from 0-5v when spinning tire in neutral. I'm receiving 5 volts at pcm harness between c18 and a9 wires, it no pulse.

Have changed cluster for known working unit. Receiving 5volts at b11 wire but again, no pulse. Blue white wire is getting continuity between vss, harness, and cluster. Any help is appreciated. Everything was working before swap, only change is the ecu.

 

Hrm. No one have this issue?

 

There shouldn't be 5v on the signal out wire. It should be a 12v pulse 4 times per tire revolution.

1) Make sure there is no fluid in the plug causing a short or cross circuit.
2) Check continuity between the VSS signal wire at the plug to the ECU.
3) Repair any wiring damage and clean all pins in the VSS male and female plugs. IF any are blue/green and corroded, replace them.

 

Oh alright. I'll check that out. That confuses me tho. As literally the factory service manual says to check a 5v pulse ...

 

K. As stated. I have continuity everywhere. And as per the service manual, I am receiving 5 volt pulse at vss, but no where else.

 

As per the honda service manual it is a 5v to 0v pulse 4x per revolution. Which I'm getting through a service connector attached between vss and connector. Just not receiving the pulse at ecm connector c18 and a9. Or at cluster b11 to ecm c18.

Reference pages 11-112 and 23-124 1998 honda service manual.

Could it be an issue with this obd2a to obd1 conversion harness? Problem with the chipped ecu?

 

I'd be looking at that conversion harness if it were me.

 

Alright I'll have a peek. Thanks

 

Ya. No dice. Getting continuity through both sides. :/

 

what do you mean both sides? You do realize that the vss signal splits off to 3 other components? cluster, ecu and cc?

 

I mean both sides in regards to the conversion harness. So continuity from connectorc18 on obd2a side to b10 on obd1 side...

 

Bump. Tried another socketed ecu p06 as well. Same issue.