tapped into temp sensor wire now it wont start
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From: Glen Burnie MD
tapped into temp sensor wire now it wont start im hooking up a temp gauge and i went to tap into the temp sensor wire and then my car wouldnt start. then when i unhooked the tap wire it started up. what could be the reason for this did i tap the wrong wire. i tapped the yellow wire not the black one.
Thanks, Chris
Thanks, Chris
TECH Veteran
Joined: Dec 2008
Posts: 4,147
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From: Little Rock, AR
That one goes to the computer. You need to leave it alone. You will only screw up the signal to the computer. The gauge temp sensor is in the driver's side head as post 4 says.
http://shbox.com/1/temp_sensor2.jpg
http://shbox.com/1/temp_sensor2.jpg
Thread Starter
Launching!
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From: Glen Burnie MD
ok so i tapped into the side sensor which is a single wire and then my temp gauge on my cluster was reading like 220 and the car was cold. i cut the wire then it went back to normal. what is going on how come i cant get add another temp gauge and get it to work
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Joined: Dec 2008
Posts: 4,147
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From: Little Rock, AR
You can't "tap onto" those circuits. Another gauge must have it's own sensor and circuit. I thought you were going to use the head location for another gauge-not tap into the one that was there.
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Tapping the O2 wiring will undoubtedly cause resistance issues which the PCM will likely pick up and set an SES light, messing with what would otherwise be accurate readings. If you're looking for an A/F gauge, the best thing to do is to add another O2 sensor bung/wiring (or two).
It is generally unwise to tap into most critical engine sensors used by the PCM (water pump sensor, O2s, etc.).
Just replace the 2 wire sensor on the waterpump for a 3 wire sensor.
The 3 wire still send a signal to the ECU and the third wire can make the after market gauge to work.
I have aftermarket gauge hooked up to the sensor on the left side cylinder head and the Factory ( Mazda in my case ) gauge hooked up to the new 3 wire sensor on the waterpump.
The 3 wire still send a signal to the ECU and the third wire can make the after market gauge to work.
I have aftermarket gauge hooked up to the sensor on the left side cylinder head and the Factory ( Mazda in my case ) gauge hooked up to the new 3 wire sensor on the waterpump.
Last edited by mpcv2000; Sep 13, 2011 at 05:53 PM.
Thread Starter
Launching!
Joined: Oct 2008
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From: Glen Burnie MD
the gauges came with the temp and oil pressure sending units. there is a port next to the oil filter that i can use for the new oil pressure unit, right. and for the temp is there a easy port to get to that i can use or would it be easier to go to a three wire sensor.
also for the air fuel gauge can i get any o2 sensor. so a single wire o2 will prolly be my best bet considering it will only be for the gauge.
also for the air fuel gauge can i get any o2 sensor. so a single wire o2 will prolly be my best bet considering it will only be for the gauge.
the gauges came with the temp and oil pressure sending units. there is a port next to the oil filter that i can use for the new oil pressure unit, right. and for the temp is there a easy port to get to that i can use or would it be easier to go to a three wire sensor.
also for the air fuel gauge can i get any o2 sensor. so a single wire o2 will prolly be my best bet considering it will only be for the gauge.
also for the air fuel gauge can i get any o2 sensor. so a single wire o2 will prolly be my best bet considering it will only be for the gauge.
You need a wide-band specific O2 sensor. A narrow band sensor (OEM replacement) won't work.
You could remove the factory coolant temp sending unit from the driver side cylinder head and use that port if you want.
the gauges came with the temp and oil pressure sending units. there is a port next to the oil filter that i can use for the new oil pressure unit, right. and for the temp is there a easy port to get to that i can use or would it be easier to go to a three wire sensor.
As far as the temp gauge you can always buy a mechanical and tap into the passenger side cylinder head.
