Question about 2001 Volvo S40

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Car engine starts to race, was told it was ect, water temp thing, is that possible? Is it something i a non mechanic can fix or change?

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Also could be fuel pressure regulator.If the ECT Sensor is bad it will have black smoke coming out of exhuast while driving down the road.

Posted on Apr 06, 2011


You need a Repair Shop,just by the
way your question reads

Posted on Apr 06, 2011


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TEMP GAGE JUST QUIT , AUTO ZONE PUT SCANNER ON IT CODES P0480 AND P0116 CAME UP , GOING TO change the temp gage sender , but i think something else is wrong , find out after i change tsu ,

code p 0480 refers to engine coolant blower motor 1 ---circuit malfunction=== causes ---wiring ---engine coolant blower motor ---ECM
code p 0116 refers to engine coolant temperature (ECT) sensor ---range b/performance problem ====causes coolant thermostat---poor connections---wiring---ECT sensor

May 07, 2017 | Cars & Trucks

1 Answer

I have a 2003 Suzuki aerio . Need to know where is the temperature sensor is located and if possible do you have picture

temperature of what, ?
cars can have over 5 temp sensors.
induction AIr, IAT.
gage dash water (gauge sender or used ECT)
A/c cut out sensors of 2 types. core and engine overheat.
transmission temps.
so we cant guess, your symptoms or which one.

login to and read.
it's there.
or post engine size and what THING is wrong temperature.

Nov 25, 2015 | Suzuki Cars & Trucks

1 Answer

2002 odyssey will not shift and will only go 25mph. Flashing codes p0118, p0740, p0730, p1740

p07xx codes are transmission failures, the FSM covers that
the A/T tranny is complex.
when a DTC sets, that means , TO DO MORE TEST to find the Cause. the ECU can not guess, what is wrong,.ever.
it can only report tests that fail, called, "monitors" OBD2 jargon.
see the great review here (he knows his fact !)
see the 10 tests above link. (fsm tests, they are)
mindless tests. no tech needs this. its just a 2 wire sensor.
if fact a thermistor. NTC type. that is all we need and the trip points.

lets review them all, (really, get the FSM and read it) or
0118, ECT reads wrong. engine coolant temp sensor .
with all sensors, its means:
P0118 ECT Circuit High Input
this will cause Limphome , so must be fixed first !!! low engine power.
the key word there is HIGH, (too high temp, too high voltage or current) the FSM tells which it is. Voltage, (odd huh? but is true)
on my car this means Open failure, over 10.4vdc is a hard fail.
  • ECT ground wire open
  • ECT hot wire open.
  • ECT bad, inside its going OPEN circuit.
  • its not too hot, as hot is lower voltage !
  • its reading insane too cold, that is, colder than possible.
  • someone disconncected this sensor with key on. so, reset it.
  • Bad ECU, (nah) or wires to ECT , as always, wires can be it.
  • the 10 tests above link. (fsm tests they are)
  • A short frorm system 12v to the ECT hot wire,
make sure dead cold , rad cap off, the rad if FULL of AF? 50%
is it> that means the ECT is under water.
no ECT works right, dry, nor engine. so check the water first.
no EFI system works right with a Crazy ECT, non do.
with cold engine, you off the ECT connector (lock lever !) then
see about 3000 ohms, (see table in FSM)
then put back conn
get engine fully hot.
now off the ECT connector. again.
now reads 300 ohms. (about)
see the ohm change there, 10 for 1.?
300 ohms is about 200 F, see FSM charts for you ambient temp cold.
i never try to guess that. here.
if you connect any scan tool to the OBD2 port you can what
live data from the ECT till the cows come home.
why not do that. see it mess up.
the check the ECT volts key on, and ohms key off.
bingo, the problem is found.

the ECU will not lie to you, it will tell you that is measured.
either a valid temperatures or out of legal range.
in fact the ECU is just a voltmeter, that scales the volts to temperature.
we call this the ECT catastrophic monitor. (out of range)

fix above first.
2 p0740
No other A/T trouble codes set, engine running at cruise speed with VSS inputs received, and the PCM detected the lockup clutch did not engage or disengage correctly.
3 P730
same as above
4: P1740 (factory code, for same as above 740)
i will not attempt to repeat the 200 pages in the FSM on transmission.
you can read it any time. at or buy the FSM.

Feb 25, 2014 | Honda Odyssey Cars & Trucks

2 Answers

I have 1999 nissan sentra andit has been overheating. I replaced the thermostat and water pump and it is still overheating. What could it be?

You may want to check and see if the ECT (Engine Coolant Sensor) is faulty. It should drive the temperature gauge and if it's bad, it could be telling you that the engine is overheating when it is actually running at normal temprature.

Jun 20, 2012 | 1999 Nissan Sentra

1 Answer

I have a 2004 Camri and I changed the timing chain. ever since the car has a hard start. please explain

First what engine are you talking about? If it is chain driven, then it must be the 2AZ-FE engine. If so, I do not understand why the chain would need to be replaced simply because the vehicle was unused for a few years. Also, the water pump on that engine is external and is not driven by the timing chain, so I fail to understand what changing the timing chain would have to do with engine temperature unless you did not put the serpentine belt on correctly and the pump is running backwards or something.

I also do not know why you say there is a problem with the temperature when you say the temperature is in the middle-----theat is where it is SUPPOSED to be. If you think your gauge is reading incorrectly, then that is what must be diagnosed. First, you must verify that it is incorrect by measuring actuall engine temperature with an infrared thermometer next to the temperature sensor. Then you must compare the actual temperature reading with the ECT data in the engine control computer to see if the computer is reading it correctly. If it is reading it correctly and your gauge is reading too high, then there is a problem with the gauge in the instrument cluster. If the computer is not reading the temperature correctly, then you either need to replace your temp sensor or repair the circuit between the temp sensor and the computer.

The hard starting could be caused by a whole bunch of things. You could be off on your cam timing. You may have installed the Crankshaft Position Sensor Plate upside-down. It could be something like you have a tank full of rotten gas if the vehicle has been sitting for 3 years.

If you are going to a mechanic that is advising really dumb "fixes" like leaving sensors unplugged to get your cooling fans to turn on, I would highly recommend going to a different mechanic.

Dec 16, 2011 | 2004 Toyota Camry

1 Answer

How do you fix a blown head gasket for mazda mx3? And what would cause it to idle low and overheat to where it shuts off.

check your water pump and ects (engine coolant temp sensor) and just replace head
gasket the other thing to check for low idle is under the throttle body is a erg valve it it what lets in more or les air depending on the temp of the engine it has coolant lines going to it and if blocked can not work of this help

nz mechanic

Nov 08, 2011 | 1994 Mazda MX-3

2 Answers

I have a 2002 Ford Taurus SE ... I changed the water pump about a year ago because the mechanic said it was bad . My car starts to run hot when it is idle . As long as I am driving it stays half way. I...

Certainly sounds like a fan problem. I would check all your fuses, relays. Possible ECT (electronic coolant temp sensor) or even fan motor itself. Hope this helps,TJ

Aug 08, 2011 | 2002 Ford Taurus

3 Answers

1996 Saturn won't start- engine turns over

OK I don't know if this is your problem but my 92 sl2 is kinda the same way. my sl2s ECTS went out and it dose the same this is what it looks like4c01145.jpg you will have to remove the air duct to get to it and this is were it's located keep in mind there are two of them you want to unplug the one with two wires it is lower on the block. but do not remove it.
after unpluging it try starting your car if it starts them you will have to get a new ECTS Coolant Temp Sensor. btw don't drive around with it unpluged just becouse it runs dosen't mean you should use it like that.

Jan 21, 2009 | 1992 Saturn SL2

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