Question about Chevrolet Malibu

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My ect sensor was replaced because my guage wasnt working consisantly[it would work than just stay on cold] n my check engine also goes on and off. Could it be my thermostat or do i have to flush my radiator? I already check the coolant levels n its ok.

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  • Chevrolet Master
  • 6,826 Answers

It could be the wiring between the sensor and the gauge or the wiring between the ECU and the gauge which is bad.

I don't think it's the thermostat or that you have to flush the radiator because the levels and the actual temperature is ok.

It's not boiling over on you.

Posted on Nov 06, 2010

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2 Answers

How do I check temp. Sensor?


it is a sender unit not a sensor unit
take the wire off it and see if the gauge falls to zero
put the wire back on and if it goes to hot ,replace the sender unit
the difference is that temp gauge sender units have 1 wire to it and work through the gauge to it then through a heat altered resistor in it to earth (ground)
A temp sensor has more wires to it and works from the ecm
it closes a circuit when the coolant reaches a preset temperature, sending a signal to the ECM which then closes a relay to make the fan/s run to cool the radiator

Oct 05, 2015 | 1997 Isuzu Hombre

2 Answers

The coolant neeldle stays on cold it doesnt even reach the middle line where it should be but the heat works


its the thermostat sensor one with a small copper top that the wire just clips onto.

Dec 06, 2013 | 2009 Pontiac Torrent

1 Answer

1987 suzuki samurai 1.3 stock engine. Temperature gauge is not working I decided to replace the Coolant Temp Sending Unit after market sender. I have the sender with two prong. Still my gauge is not...


rare car, how cute. its a 1.3L what ,its EFI , not carb.
the ECT and guage are not related at all.
each has its own sensors.
dont use a torch you will kill it, use hot water man.
please..................
the guage is a 1 wire sensor. it has a different resistance profile than
the EFI Engine coolant sensor ECT. is a different sensor.
the EFI sensor 2 pins, reads 300 ohms hot and about 3000 ohms cold.
hot is 200 F, not torch 2000f hot. for sure. never exceed 212f on any sensor ever.
I must presume you are futzing the wrong sensor.
first off, I will cover just the gauge, and the fsm is on line
for free, and you can read the guage tests. they are simple simon,

see here, see the books?
http://www.acksfaq.com/sitemap.htm

im and expert on the sidekicks but they are close to sammi.
infact its and evolutionary change.

the guage sender is sold everywhere, and has unique spec.s.

ill use rockauto.com so you can see them all. sold.
first off the guage has very low resistance,as does the gauge sender
that is because is thermal acting the guage gets hot and the needle moves, very very crude this. very very old school stuff.
they did the bs until 1995.
chapter 21. electrics. sammi.
page 21-12 , fuel level meter and guage.
direct link to that here.
http://www.acksfaq.com/86-87_410_FSM.htm
see that?
pdf page 145
use a 194 lamp and ground the yellow wire as shown
meter goes upscale the meter is good.
now the sender.
is RTC reverse temperature coeffiecent, that is
hotter = lower ohms. pdf page 146 left.
122f is about 155 ohms
176F = about 50 ohms
212f (boiling water) is 28 ohms and gauge shows HOT.

that is it for the 1 wire sensor.
stupidly they say to put sealing tap on threads,
dont, or you get an open ground. amazing...
tighten firmly or risk cracking the intake. its a tapered British thread.

now the rock. the right sensor for JUST the Guage , coolant.
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1271135&parttype=4748


a real FSM
and a real source of parts, 1 post.
all for free,

Aug 27, 2013 | 1988 Suzuki Samurai

1 Answer

2006 f150- temperature gauge stays cold but "check gauges" flashes in mini message center.


Since the temp gauge is not working correctly, you get the warning message.
Could be a faulty temp sensor or a problem in the wiring harness.

Apr 08, 2013 | 2006 Ford F-150

3 Answers

P0128 (and P0116) on 2006 GMC Sierra v-8, 5.3L, 4x4. Originally getting low temp readings on guage. After replacing the thermostat, the problem seemed to be fixed. A few days later, I was getting my...


P0116 - Engine Coolant Temperature (ECT) Circuit Range/Performance Problem
The ECT (Engine coolant temperature) sensor is a thermistor which changes resistance based on temperature of the coolant in contact with it. The ECT sensor will be located in the block or coolant passage. Usually it is a two wire sensor. One wire is a 5 Volt supply from the PCM (Powertrain Control Module) to the ECT. The other is a ground to the ECT.

As the temperature of the coolant changes the resistance on the signal wire changes accordingly. The PCM monitors the reading and determines coolant temperature in order to perform essential engine fuel management. When engine coolant is low, sensor resistance is high. The PCM will see a high signal voltage (low temperature). When coolant is warm, the sensor's resistance is low and the PCM will see a high temperature. The PCM expects to see slow resistance changes on the ECT signal circuit. If it sees a quick change in voltage that isn't consistent with an engine warming up, this P0116 code will set. Or if it sees a lack of change in ECT signal, this code may set.

Symptoms: There may be no noticeable symptoms if the problem is very intermittent, however the following may occur:
MIL (Malfunction Indicator Lamp) illumination
Poor drivability
Black smoke at tailpipe
Poor fuel economy
May not idle
May exhibit stalling or misfires

Causes: Potential causes of the P0116 code include:
Missing or stuck-open thermostat
Bad ECT sensor
Short or open on signal wire
Short or open on ground wire
Poor connections in wiring

Possible Solutions: If there are any other ECT sensor codes, diagnose them first.
Using a scan tool, check the ECT reading. On a cold engine, it should match the IAT reading or should be equal to ambient (outside) temperature reading. If it does match the IAT or ambient temp, check the freeze frame data on your scan tool (if equipped). The saved data should tell you what the ECT reading was when the fault occurred.

a) If the saved info indicates that the engine coolant reading was at the coldest exreme (around -30 deg. F) then that's a good indication the ECT resistance was intermittently high (unless you live in Anchorage!) Check for an open in the ECT sensor ground and signal circuits and repair as necessary. If they appear okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

b) If the saved info indicates that the engine coolant reading was at the warmest exreme (around 250+ deg.F) then that's a good indication the ECT resistance was intermittently low. Check for a short to ground on the signal circuit and repair as necessary. If it appears okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

Other ECT sensor and circuit related DTCs: P0115, P0117, P0118, P0119, P0125, P0128
--------------------------------------------------------------------------------------------------------------------

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

Symptoms: You will likely not notice any drivability problems other than the MIL illumination.

Causes: A code P0128 may mean that one or more of the following has happened:
Low engine coolant level
Leaking or stuck open thermostat
Faulty cooling fan (running too much)
Faulty coolant temperature (ECT) sensor
Faulty intake air temperature (IAT) sensor

Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
Verify coolant strength & level
Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
If the above items check out good, replace the thermostat
If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code



These codes are telling you that the engine temperature is not sufficient. This can be caused by a faulty coolant sensor,air in the cooling system,or a faulty computer.
The engine should run at 190 F & higher when warmed up. Scan the computer system to view engine temperature.

Keep us updated.

Oct 01, 2011 | 2006 GMC Sierra

1 Answer

Backfires on cold engine start,then goes away as it warms up.


the ECT sensor for the computer could be giving the computer a false temp reading and causing it to happen also..thats why it runs good warmed up... if this does not work, clean or replace mass airflow sensor. good-day ! ECT- engine coolant temperature sensor,

Aug 18, 2011 | 1994 Ford Taurus

1 Answer

Temp guage stays on cold and engine warning light


You more than likely have a thermostat that is stuck open. When this is the case with the computerized vehicles today the computer tells your engine that it is still cold and dumps more fuel to the engine. When this happens the extra fuel goes through your exhaust and uaually makes the check engine light come on as you have O2 sensors that register this flow. Replace the thermostat, disconnect the negative side of your battery for 5 minutes and re-connect. If this has been going on for a while the light may come back on. You may have to drive it for a while until it clears all the excess fuel out of the system then do the battery thing again. You probably have been getting poor gas mileage as well. Hope this helped. Just make sure that the engine light does not flash as this is a sign of major problems and you should not drive it if it flashes

Feb 06, 2010 | 2005 Ford Mustang

2 Answers

Heating System


The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Oct 01, 2008 | 1993 GMC Sierra

2 Answers

Radiator cooling fan


Just fixed this problem. Replace the sensor or switch on the thermostat housing and viola!

Sep 19, 2008 | 1994 Honda Civic

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