I'm almost done with all the wiring on my Y7 swap since my old B1 spun a bearing. Now, I've lengthed my coolant temp sensor wires since the B1 temp sensor is on the back of the block where as on the y7 it's on the themostat housing. And I also used the motor mount and bracket from the B1 to the y7 to make the motor sit correct and not all akward and ish.

Now comes the last problem, I hope. On the crank pully side of the motor, there is a wire right next to it. I'm not sure what this is or where it goes as the B1 didn't have that. WTF is it? Do I need it or not?

I'm so close to being done but yet so far!! Ahhhh!!!!!

 

The wire next to the crank pulley would be your crankshaft position sensor I believe?...

 

I know it's not that. The CPS is in my TD-02U(PM6) dizzy that I'm using from the 88-91 Civic/CRX Si. I'm using all my OBD0 stuff on this motor.

 

That sensor is your crank position sensor.
The y7 was origionaly OBD-2. But for your OBD0 then you dont need to do anything with it.

 

Exactly what I found out while trying to figure out how to use google Thank you man!

 

y7 coolant temp sensor is under the distributor, just like the b1...both motors also have the sensor on the thermostat housing. crank position is unused if you're using the obd0 distributor...

 

The b1 does NOT have the coolant temp sensor under the dizzy on the thermostate housing. It's on the back of the block. If you look on the b1 block you'll see a sensor that has 2 little stems on it, that's the coolant temp sensor. On the b1 thermostat housing there is only a ground spot. That's it.

The y7 has the temp sensor on the thermostat housing and not on the block. Read up on it, you'll see that everyone that has had done the y7 swap in a 88-91 civic/crx they'll say they had to extend the coolant temp sensor wires just like I had to do.

 

i guess my d16y7's and my current ls are freaks of nature then

 

you are both mistaken.

the ect sensor and ect sending unit are both on the side of the cylinder. whether that be the b1, y7, ls, etc, they are all in the same spot. the temp sensor is what provides temp info to the ecy. the 1 prong connector is what the temp gauge in your cluster gets its reading from.

-fo-do, you are mixing up the coolant temp sensor and the coolant fan switch. the fan switch is in fact located on the back of the b1, and on the thermostat housing of the y7. it's what provides continuity for the wires connected to it so that the coolant fan will come on.

-speedooo, the crank position sensor is always used no matter if the dizzy/ecu combo is obd0,1, or 2. the sensor near the crank you are seeing is the crankshaft fluctuation sensor (ckf) and is not needed when using either an obd0 or obd1 ecu.

 

Hmmm.. I retract my statement then

 

yeah that sounded vague, my bad...i was referring specifically to the sensor around the crank pulley

 

Ohhh so you were talking about the CKF sensor then lol. All is good no worries.

 

Yeah sorry I'm pretty vague lol. I was stating that the plug by the crank pulley would be unused in an ef, the coolant temp sensor was located underneath the distributor on both motors, and the fan switch on the thermostat...no extending of wires needed.

 

Well unfortunatally you have to extend the coolant temp switch wires to the thermostat. My b1 didn't have any kind of sensor on the thermostat housing, maybe mines an odd dock? Oh well. I got other problems with the swap I need to figure out

 

I've never had a motor without that sensor lol that is pretty odd. This is how my b18a1, b18b1, 2 d16y7's, d15b8 and d16y8 were all setup (fan switch/coolant temp sensor)

 

The fan swith is where its supposed to be on my y7 but I'm pretty damn sure on my old d15b1 it was on the back of the block. WTFuuuuuuuhh

 

Sorry for bumping your old thread, Justin. Seems on topic though...

So, does this sound right? I checked the manuals (1996-1998 Civic Service Manual and 1989 Civic CRX Service Manual and the 1989 Civic CRX Electrical Troubleshooting Manual. So the names here are based off of what Honda calls them.

1 matches to 1 and 2 matches to 2? I found other switches that seem possibly related.

Sorry, I just want to be 100% sure before I start snipping and extending wires. I have an extra OBD2 harness to use plugs from, so it's not a concern there.


EF SOHC

1 OBD0 temp gauge sending unit
Left side of block under distributor
(page 10-3) 1P (YEL/GRN) (goes to temp sensor on cluster in car) C108 (STD/HF)/C159 (SI) (page 81 ETM)
--
2 OBD0 coolant temp switch
Middle rear of engine block
(page 23-78) 1P YEL/GRN C113 (STD)/C164 (SI/HF) (page 63 ETM)
-----

EK SOHC

1 OBD2 engine coolant temp (ECT) sending unit
Water outlet, upper radiator hose, front right side of engine
C122 / 2 cavity (RED/WHT, GRN/BLK) (page 10-9, 11-4, 11-76, 23-16, 23-111)
--
2 OBD2 engine coolant temp (ECT) switch A
Thermostat housing cover, lower radiator hose, rear right corner of engine
C119 / 2 cavity (page 23-16)