CptHMCrunch

On the OBD II d15b non-vtec there are two sensors located directly below the heater core inlet hose. Both of the sensors are in the block. The single wire sensor is the temp sending unit for the gauge cluster? What is the other sensor? It is a two wire sensor. It is adjacent to the temp sending unit. It is not the thermoswitch for the fan as that is located on the thermostat housing.

The OBD II d15b non-vtec is going in a 1991 civic hatch with a rywire OBD0 -> OBD I jumper harness. The ECU is a p06. Does the engine that I am putting in the car have any sensors that do not need to be plugged in? This is what I was thinking as far as sensor that do not need to be plugged in.

Sensor: knock sensor
Location: back of block
Status: not needed

Sensor: unknown two wire sensor
Location: adjacent to cluster temp sending unit
Status: not needed

If you have any information on problems I will encounter while putting this motor in the car please let me know as I am relatively new to motor swaps.

Thank you,
Cpt. HM Crunch

4drEF

any of these look familiar to your sensors?

Freemananana

iTrader: (3)

Okay, the Knock sensor isn't needed if your ECU doesn't have a knock board. The ECU you mentioned probably doesn't.

The 2 wire sensor next to the cluster temp sending unit is VERY NEEDED. I did a quick search for you.

The ECT is very important and tells the ECU a lot from what I know. It needs to be hooked up. There is definitely a connection on the harness for it.

I know from experience, honda uses the same 2 wire plug for almost everything. Make sure you haven't swapped plugs on accident.

Freemananana

iTrader: (3)

I believe what he is referencing is under the distributor. Next to the coolant temp sending unit for the dash cluster.

4drEF

Ah - you are probably right!
I read heater core and assumed back of block.

Freemananana

iTrader: (3)

Thanks for the picture though. That would have helped me so much when I was trying to figure out the sensors on the back of my block. Hardest part of searching is figuring out what other people call it.

I saw the sending unit and couldn't figure out what that one was called. It's weird the OP doesn't have the ECT plug just dangling there. Trying to figure out where he has that plugged in at.

Have you tried to start the motor at all?

jlicrx

2-wire sensor has red/white and green/white wires

1-wire sensor has yellow/green wire

CptHMCrunch

The motor is not installed in the vehicle yet, but you have answered my question. Thanks.

Freemananana

iTrader: (3)

Yay! Now this thread will forever be solved and will help people who search for the same issue.

L14m_93

Hi I've been lookin around online for a whole tryna figure this out I have the yellow/green wire just dangling around near my dizzy it doesn't have a plug on it at all just a single wire all alone I'm sure its always been like this I just taped over the end so it wasn't showing bare wire and everything was fine but now my temp gauge isn't going up at all and my fan won't kick in at all either speedo is also not working but the plug for vss is loose so i don't think its related, vtec won't engage either, ps I swapped a b16a into my ej9 not sure if this will make a difference but its got the same single yellow/green wire just dangling there without a plug on the end and I have no idea how to connect it.......