Mazda Rotary Club

Cars by Model Type => 3rd generation RX-7's => Topic started by: civicboy28 on July 12, 2009, 03:45:16 PM

Title: Water temp sensor location
Post by: civicboy28 on July 12, 2009, 03:45:16 PM
Anyone know where the water temp sensor is located as mine is on the blink I think
thanks
Title: Water temp sensor location
Post by: Grizzly on July 12, 2009, 04:07:58 PM
On an FD there are three water sensors, First (most obvious) on the front of the water pump housing (where you top the water up on the engine) is a Water level sensor, the second/third is on the back of that big casting. The Fan switch is the one with a single wire coming out and the ECU switch is the one with two wires.

If you replace the Sensor be careful with the wires as they will be old and Brital (won\'t like being man handled too much). When you replace the plugs make sure they are clean and well on (may even be worth putting some zip tie\'s round to make sure it\'s on tight) as this will cause you all sorts of problems if you get a bad connection.
Title: Water temp sensor location
Post by: nikp on July 12, 2009, 07:30:58 PM
erm.....you forgot the one that sits under the oil filter. That\'s the temp sensor that the ECU uses, so probably the most important one!
Title: Water temp sensor location
Post by: civicboy28 on July 12, 2009, 09:19:49 PM
Got it thanks. just going to order the sensor tommorow and hopefully that will cure my problem.
Title: Water temp sensor location
Post by: Grizzly on July 12, 2009, 10:11:32 PM
Quote from: nikp;625496erm.....you forgot the one that sits under the oil filter. That\'s the temp sensor that the ECU uses, so probably the most important one!
O yeh there is one in the rear plate too isn\'t there.

Is that not the Instrument gauge sensor? I may be getting confused??
Title: Water temp sensor location
Post by: nikp on July 12, 2009, 10:29:09 PM
Its both. Its the gauge one and the one used by the ecu.
Title: Water temp sensor location
Post by: Looney on July 15, 2009, 02:02:46 PM
Get out, does the sensor under the oil filter really feed the ECU? I thought it was the sensor in the back of the filler block that feeds the ECU, with the level sensor at the front of the block, and the sensor under the oil filter only feeds the temp guage.
 
I have not had this sensor connected to the sender under the oil filter since I had got the car. The sensor blade connector had broke. I\'ve been meaning to look at this, and see about somehow rewiring it up. Not had any problems yet with temps however.
Title: Water temp sensor location
Post by: civicboy28 on July 15, 2009, 05:10:55 PM
the one at the back of the filler block does the ECU. Tested it with my power FC + commander and a blow lamp lol.
Title: Water temp sensor location
Post by: gillard28 on July 15, 2009, 05:59:08 PM
Have you got it sorted yet boss:wave
Title: Water temp sensor location
Post by: Looney on July 15, 2009, 07:46:59 PM
Holy cow!! I best try and get it re connected asap then!! You sure it gives a reading to the ECU and just not use the ECU harness, leap frogs through the ECU to then feed the gauges? Sorry I\'m just curious, lol.
 
Mind you in saying that I\'ve not had temp problems with out it not being connected as yet. lol
Title: Water temp sensor location
Post by: civicboy28 on July 15, 2009, 07:49:52 PM
Gary was ment to call me back actually today. but not heard from him today. i will chase him tommorow.
Title: Water temp sensor location
Post by: gillard28 on July 15, 2009, 07:50:14 PM
Quote from: Looney;626713Holy cow!! I best try and get it re connected asap then!! You sure it gives a reading to the ECU and just not use the ECU harness, leap frogs through the ECU to then feed the gauges? Sorry I\'m just curious, lol.
 
Mind you in saying that I\'ve not had temp problems with out it not being connected as yet. lol

LOL... Well i guess the motor is happy with that correction :3gears-lh
Title: Water temp sensor location
Post by: civicboy28 on July 15, 2009, 07:51:30 PM
From what i can see the one on the back of the filler (green connector)  does the ecu. doesnt seem to affect the gauge on the dash tho.
Title: Water temp sensor location
Post by: gillard28 on July 15, 2009, 08:03:48 PM
erm... not sure. i removed my gauge. I will check my stuff. You only need the ecu input. the rest is purly visual and the gauge aint linea anyway..
 
scott
Title: Water temp sensor location
Post by: Looney on July 16, 2009, 12:40:15 AM
Hang on my bad, I was getting confused there. lol. I thought you guys were talking about the sender under the oil filter. Thats the one I\'ve not got connected. I got the other 2 connected around the filler.
Title: Water temp sensor location
Post by: Grizzly on July 16, 2009, 11:04:47 AM
Quote from: Looney;626832Hang on my bad, I was getting confused there. lol. I thought you guys were talking about the sender under the oil filter. Thats the one I\'ve not got connected. I got the other 2 connected around the filler.

Its simple, if you are on a stock ecu it will go into limp mode if its not getting the engine coolant temp (so it will not run properly) if you have a PFC it proberly would run to a degree (most likely quite rich) but if you look on the controller where it says water Temp there will be a line instead of a number. Also does your water temp work on the dash?

I was fairly sure it was the sensor on the back of the Pump housing as thats the one that was causing us problems (bad connection making the car go into limp)
Title: Water temp sensor location
Post by: Looney on July 16, 2009, 01:27:31 PM
Yeah, sorry, got the water level and ECU sender connected thats on the water filler housing block. The sender under the oil filter is not connected. Car runs fine, but water temp gauge on the dash does not work, although low level warning does.
 
(I keep speed reading the posts and mis read filler and filter in a few posts above! sorry!)