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What is (ECT) - 1995 Toyota 4Runner

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ECT stands for Electronically Controlled Transmission. When you push the button in, there should be a light on the dash that says "ECT POWER". This changes the normal shift times (based on engine vacuum, rpm, and throttle position) to a later point. This means simply that the engine rpms will go higher before shifting to a higher gear when you're accelerating. It helps build speed more quickly but uses more gas to do so.

Posted on Oct 04, 2010

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What can cause trouble code p0118 engine coolant temp sensor ( high voltage input ) 99 intrepid 2.7 v6


The engine coolant temperature (ECT) sensor is a variable resistor, that measures the temperature of the engine coolant. The ECT sensor has a signal circuit and a low reference circuit. The engine control module (ECM) supplies 5 volts to the ECT signal circuit and a ground for the ECT low reference circuit. When the ECT is cold, the sensor resistance is high. When the ECT increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a high voltage on the ECT signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the ECT signal circuit. If the ECM detects an excessively high ECT signal voltage, which is a low temperature indication, DTC P0118 sets. You have A bad coolant temp sensor or a wiring problem !

Aug 05, 2015 | Cars & Trucks

1 Answer

Coolant sensor bad


no it does not.
not ever.
it may run a test on the ECT and tell you it reads wrong, sure.
but that ONLY means the test failed, a technician
then tests it by hand , then the wires.
no ecu can tell you what part on any car is bad, ever.
it ONLY a test.

what does ECT read , in ohms cold 3000 or more? what?
then ECT read hot, 300?
if the ECT reads per the FSM chart then its good.
so the wires are bad.
i'ts that simple..
rare but possible is intermittent ECT the cause.

The PCM checks the ECT 3 ways.
1: open
2: shorted.
3: too slow to rise. (bad engine coolant thermostat , and others) ask

so in case 3 , the ECU is not saying the ECT is bad. it dont know.
it only sees it reads wrong, and never ever knows the why.

Mar 19, 2014 | 1996 Jeep Grand Cherokee

1 Answer

How do I fix 04 Jeep grand Cherokee has a code P01281


Diagnostic Trouble Code (DTC) P01281 has a generic description of "Engine Coolant Temperature Cold Too Long".

The Powertrain Control Module (PCM) collects data from the Engine Coolant Temperature (ECT) sensor at engine startup. After more than 3 minutes of engine operation and less than 1 hour of engine operation, it will again monitor the ECT data. DTC P01281 sets when the ECT data does not indicate sufficient engine warm-up during this time.

The possible causes are:

> Faulty Engine Coolant Temperature (ECT) sensor
> ECT circuit malfunction
> Engine coolant thermostat stuck open

If you are also not getting much heat from your heater lately, the problem is MOST LIKELY the thermostat.

Otherwise, ECT operation should be verified using a scanner that can read live data from the ECT at the PCM and comparing this reading with the actual engine temperature as it is measured near the ECT sensor with an infrared thermometer. If the thermometer does not agree with the ECT data, then the ECT sensor and circuit must be diagnosed to find the cause. If the thermometer DOES agree with the ECT data, then replace the thermostat.

Nov 20, 2011 | 2004 Jeep Grand Cherokee

1 Answer

Car wont start, saying code p0116 on a 2006 dodge caravan


this obd2 trouble code table can help you understand the meaning of code.
and for this code, you can try,

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.

Sep 09, 2011 | 2006 Dodge Grand Caravan

1 Answer

Code po117a what does this mean


P0117 - Engine Coolant Temperature (ECT) Circuit Low Input

The ECT (Engine coolant temperature) sensor is a thermistor located in the engine block or other coolant passage. It changes resistance with changes in temperature of the coolant that it's in contact with. It's usually a two wire sensor. One wire is a 5 volt reference from PCM (Powertrain Control Module) and the other is a ground supplied from PCM.

As the temperature of the coolant changes, the resistance of the sensor changes. When the engine is cold, the resistance is high. When the engine is warm, the resistance is low. If the PCM detects a signal voltage lower than the normal operating range of the sensor then P0117 code will set.

Potential symptoms include:
* MIL (Malfunction Indicator Lamp) illumination
* Poor fuel economy
* Poor drivability
* Engine may run rough or blow black smoke out the tailpipe
* May not idle
* May start and then die

Causes: Potential causes of the P0117 code include:
* Bad ECT sensor
* Short to ground on ECT signal circuit
* Faulty or damaged connectors
* Wiring harness damaged
* Loose terminals at ECT or PCM
* POSSIBLY an overheated engine
* Bad PCM

Possible Solutions: Since this code is for an abnormally low signal to the PCM from the ECT, the PCM saw a excessively "hot" condition in the engine coolant. This could be due to faulty ECT sensor or wiring, but it could, conceivably, be caused by an overheated engine.So if your engine was overheated diagnose that first. Having said that here are the possible solutions:

Using a scan tool, with KOEO (Key on engine off) check the ECT reading on the display. On a cold engine the ECT reading should match the IAT (Intake Air Temperature) sensor reading. If it doesn't, replace the ECT sensor.

1. If the ECT reading is showing an excessively hot reading, for example more than 260 deg. F, then unplug the ECT sensor. This should cause the ECT reading to drop to the extreme cold reading (around -30 deg.F or so). If it does, replace the sensor, because it's internally shorted. If it doesn't change the reading, the check for a short to ground on the signal circuit of the ECT wiring. It could be that the two ECT wires are shorted to each other. Look for any chafing or melted wiring. Repair as necessary.
a. If you can't find any wiring problems and the ECT reading doesn't drop to the extreme coldest when unplugged, then, check for voltage coming out of the PCM on the signal wire's pin at the PCM connector. If there isn't any voltage, or it is low, then the PCM may be bad. NOTE: On some models it is possible for the 5 Volt reference signal to be temperarily shorted. This can happen if an engine sensor internally shorts the 5 Volt reference. Since the 5 Volt reference is a "shared" circuit on many models, this will cause it to be abnormally low. Usually, though this will be accompanied by several other sensor codes. If you suspect that may be the case, unplug each sensor until the 5 Volt reference reappears. The last sensor unplugged is the offending sensor. Replace and recheck the signal wire from the PCM connector

2. If the scan tool ECT reading seems normal at this time then the problem may be intermittent. Use a "wiggle" test to manipulate the wiring harness and connectors while watching the ECT reading on the scan tool. Repair any wiring or connectors that are loose or corroded. You could check the Freeze frame data if your scan tool has that function. It will show the ECT reading when the failure occurred. If it shows the reading to be at the hottest extreme then replace the ECT sensor and see if the code reappears.

Other ECT sensor and circuit related DTCs: P0115, P0116, P0118, P0119, P0125, P0128

Hope this help to check and solve it.

Jan 19, 2011 | 2004 Chevrolet Impala

1 Answer

How do you replace coolant temperature sensor on an 2001 Oldsmobile Intrigue


Removal & Installation To Remove:
ECT sensor 3.5L engine 93174g14.gif

  1. Disconnect the battery ground cable.
  2. Drain the coolant below the level of the engine coolant temperature (ECT) sensor.
  3. Disconnect the ECT sensor electrical connector.
  4. Carefully remove the ECT sensor.
To Install:
WARNING
Damage to the coolant sensor will affect the operation of the fuel control system.
  1. Coat the ECT sensor threads with thread sealer.
  2. Install the ECT sensor. Tighten the sensor to 15 ft lb (20 Nm) on 3.5L engines and 22 ft lb (30 Nm) on 3.8L engines.
  3. Install the ECT sensor electrical connector.
  4. Connect the battery ground cable.
  5. Refill the cooling system using the recommended procedure.
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Aug 29, 2010 | 2001 Oldsmobile Intrigue

1 Answer

Trouble locating cooling sensor on 2003 gmc envoy


4.2L Engine To Remove:
  1. Disconnect the negative battery cable from the battery.
  2. Drain the coolant from the engine.
  3. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation gm-04-42-1509.gif

  4. Remove the engine coolant temperature (ECT) sensor from the engine.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the engine coolant temperature (ECT) sensor into the engine. Torque the sensor to 12 ft-lb (16 Nm).
  3. Connect the engine coolant temperature (ECT) sensor connector.
  4. Refill the engine with coolant.
  5. Connect the negative battery cable to the battery.
5.3L & 6.0L Engines To Remove:
  1. Drain the coolant from the engine.
  2. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation removeect.gif

  3. Remove the engine coolant temperature (ECT) sensor from the left cylinder head.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the engine coolant temperature (ECT) sensor into the left cylinder head. Torque the sensor to 15 ft-lb (20 Nm).
  3. Connect the engine coolant temperature (ECT) sensor connector.
  4. Refill the engine with coolant.

Jul 08, 2010 | 2003 GMC Envoy

1 Answer

What does the ECT button do?


ECT means Electronically Controlled Transmission

The ECU has various shift patterns programmed into it.. When your ECT is on or "power" The ECT ECU will change the shift patterns and lock-up accordingly..

Your upshifts will come later and harder, at a higher speed.. depending on your throttle position..

ECT makes a Huge difference in all car
s where it is present

Aug 16, 2009 | 1998 Toyota 4Runner

1 Answer

Where is the engine coolant sensor located on a 2000 ford f150 V8 4.6 L?


please rate as fixya if this helps

SECTION 303-14: Electronic Engine Controls 2000 F-150 Workshop Manual
REMOVAL AND INSTALLATION Engine Coolant Temperature (ECT) Sensor — 4.6L and 5.4L Removal and Installation
  1. Remove the engine coolant temperature (ECT) sensor.
    1. Disconnect the electrical connector.
    1. Remove the ECT sensor.
ae8a8e7.gif The ECT sensor:
  • sends the PCM a signal indicating engine temperature.
  • resistance decreases as coolant temperature increases.
The ECT measures the temperature of the engine coolant. The sensor is threaded into an engine coolant passage.

Mar 19, 2009 | 2000 Ford F150 Flareside SuperCab

1 Answer

ECT PWR light appeared on dash


ECT is you engine coolant temperature. i suggest you have you ect sensor inspected.

Jan 03, 2009 | 2007 Toyota Tacoma

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