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05-05-2009, 09:49 AM | #1 |
Drives: 1999 Silver Yaris SR Join Date: May 2009
Location: Ayrshire, Scotland
Posts: 4
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Coolant Temp Sensor location?
HI, just been given (free) a 1999 Yaris SR (UK model).
It runs like a bag of spanners when it's cold, but once it heats up it's fine - whcih leads me to believe that the coolant temp sensor (connected to the ECU) is faulty - but where is it? Can anyone tell me please? Thanks. |
05-05-2009, 09:53 AM | #2 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
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I am no mechanics, but have you checked all the components? i mean.. air filter, spark plugs, o2 sensors, MAF?
What does it mean to run like a bag of spanners? Is it automatic or manual ? |
05-05-2009, 10:22 AM | #3 | |
Drives: 1999 Silver Yaris SR Join Date: May 2009
Location: Ayrshire, Scotland
Posts: 4
|
Quote:
It's a manual - but even without driving it it runs lumpy, misfires and smokes (unburnt fuel) until it's warm. I'm 100% sure it's the coolant temp sensor - I just don't know where to find it - there's 2 sensors down the flywheel side of the head - one has 3 wires and one has 2. Don't know which one it is - if I know, I can unplug it and use a variable resistor to mimic the temp sensor - and then order one from the dealer for it. "Runs like a bag of spanners" means it's running like crap! |
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05-05-2009, 12:55 PM | #4 |
Learn to Relax
Drives: 2007, Meteorite, LB Join Date: Dec 2008
Location: Anaheim, CA
Posts: 2,070
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For the USDM, 1NZ-FE the coolant sensor is on the top right of the head. Hope this helps.
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05-05-2009, 01:06 PM | #5 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
|
if it's lumpy and misfires, have you checked the coil packs ?
It's hard to believe how a coolant temp sensor could affect the car to cause such troubles. Also, if you have the 1.3L or a 1.0L, it would be very hard for us to help, as we only have the 1.5L engine in our yarii. |
05-06-2009, 07:43 AM | #6 | |
Drives: 1999 Silver Yaris SR Join Date: May 2009
Location: Ayrshire, Scotland
Posts: 4
|
Quote:
MAF maybe? The ECU warning light is on - anyone know where I can get software that will read the codes? I have an OBDII interface for the serial port on the PC, but no software. |
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05-06-2009, 08:31 AM | #7 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
|
The check engine is probably throwing a misfire code on one of the cylinder.
I'm repeating myself, Have you check the coil packs?? You are a mechanics, you should be able to diagnose which cylinder is malfunctioning. try this for the PC ODBII reader. http://obddiagnostics.com/ProgWin.html |
05-06-2009, 10:13 AM | #8 | |
Drives: 1999 Silver Yaris SR Join Date: May 2009
Location: Ayrshire, Scotland
Posts: 4
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