Question about 1994 Oldsmobile Cutlass Supreme

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I know where the engine coolant temperature sensor goes in the 3100, but where does the other end go to?

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  • jcostallos Oct 07, 2009

    We took a 3100 engine apart to fix a gasket problem, and the engine coolant temperature sensor is missing. We are assuming it has a wire and runs from the spot it sits to something? We have searched the engine for any loose wire that hasn't been connected, but to no avail. The sensor must run from the hole it sits in to something? Does that help?

  • yadayada
    yadayada May 11, 2010

    not sure i know what you mean here, other end of what??

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Yes there is a wire connector that goes to this switch

Posted on Oct 07, 2009

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Po115


The Code P0115 is a coolant sensor error (measures temperature of engine coolant). First make sure that you have enough coolant in the engine. If there is enough coolant and you still get the error then the following explanation should help:-

What is it?
This is small electrical device for measuring the coolant temperature in the engine

Where is it located? It is usually located on the engine near to the thermostat housing. The ECT is sited on the 'hot' side of the thermostat so that it senses the coolant/engine temperature before the thermostat opens and allows coolant to flow through the radiator.

How does it work? Modern temperature sensors consist of a thermistor in a sealed unit. As the temperature rises the electrical resistance varies proportionately; some thermistors increase their resistance with temperature (PTC - positive temperature correlation) whilst others decrease their resistance (NTC - negative temperature correlation). When the engine is cold at start up the coolant sensor sends an appropriate signal to the ECU. The ECU responds by increasing the length of the injection cycles to enrich the combustion mix. This is an electronic equivalent of pulling the 'choke' out on a carburetor. As the engine warms up the signals from the coolant sensor cause the ECU to shorten the injection cycles making the fuel mix progressively leaner. The process of coolant sensor and ECU interaction explains why engines have a slightly faster idle when starting cold than when running hot.

Symptoms of faulty coolant sensor
Associated OBD2 error codes DTCs: P0115 - P119; P0125, P0126, P0128

  • 2.2a Poor starting - If the coolant sensor reports in error that the engine is warm the ECU (electronic control unit) will not enrich the fuel mix at ignition. The engine will falter at idle if it is not given additional help by the driver by pressing on the accelerator pedal to maintain speed. Once the engine has warmed up the engine will behave correctly.
  • 2.2b Fast/erratic idle, Poor fuel economy - conversely ifthe coolant sensor reports in error that the engine is permanently 'cold' the ECU (electronic control unit) will keep the fuel mix rich. This is OK at start up but will become more noticeable when the engine is hot; idle will be fast and lumpy. Fuel consumption will be high due the permanently rich fuel mix set by the ECU.
  • 2.2c Excessive emissions - the enriched fuel mix delivered in response to ECT (engine coolant temperature) signal error causes the exhaust to be heavy in un-burnt hydrocarbons. This often results in 'emission test' failure.

How to check? Most often the coolant sensor is quite separate to the temperature sender, so a correct read-out on the dash board does not necessarily indicate correct sensor function. Usinga voltmeter the resistance across the electrical terminals on the sensor can be measured. By removing the device from the car and putting the end of the sensor in a pan of hot water it should be possible to see an immediate change in resistance, it does not matter so much that the resistance goes up or down but that there is a discernable change with change in temperature. Generally high resistance equates to cold temperatures and vice versa. If there is no resistance change commensurate with temperature change then the sensor is at fault. If there is simply no resistance measurable (open circuit) then the sensor is at fault. If the sensor is working correctly check the connector, the wiring and the wiring insulation for faults and possible shorting.

How to fix? Replace if found faulty

May 25, 2014 | 2001 Hyundai XG300

1 Answer

89 dodge ram truck 2500 2wd code reader says 4 codes dont know what they mean p1509, p1298, p0118 andp0113


P1509 Dodge - Leak Detection Pump Switch or Mechanical Fault

P1298 Dodge - Air/Fuel Ratio Lean Under Wide Open Throttle Condition
- Plugged air filter
- Plugged fuel filter
- Defective fuel pump
- Ignition system weak-misfires
- Defective coil

P0118 Dodge - Engine Coolant Temperature Sensor Circuit High
- Low engine coolant level
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

P0113 Dodge - Intake Air Temperature Sensor 1 Circuit High
- Faulty Intake Air Temperature (IAT) sensor
- Dirty air filter
- Intake Air Temperature (IAT) sensor harness is open or shorted
- Intake Air Temperature (IAT) sensor circuit poor electrical connection

Dec 16, 2013 | Cars & Trucks

1 Answer

Code 1 senser P0118 on a 2004 V.W beetle dicesel


P0118 for Volkswagen - (ECT) Engine Colant Temperature Circuit High

Symptoms:- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
(Inspect the following... Repair/Replace if necessary)
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat

P0118 VOLKSWAGEN Description: The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the (ECM) as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
When is the code detected?:When an excessively high voltage from the sensor is sent to ECM.

I hope this helps! Let me know if you need further assistance.

Mar 08, 2012 | Mercedes-Benz C Cars & Trucks

1 Answer

How to replace coolant sensor


Hello and thank you for using Fixya. To replace the coolant sensor in your 2004 Hyundai Santa Fe, follow these steps below:

Find the coolant temperature sensor in the engine block on the driver side of the engine compartment. It is screwed into the block and has a wire lead running to the engine wiring harness. Once you locate the sensor, disconnect the wire lead going to the sensor with an open end box end wrench. Inspect the wire lead for melted insulation and discolored insulation. Either condition will require you to replace the wire lead. Make sure the engine has cooled enough to prevent burn injury. Use the appropriate socket and ratchet or open end box end wrench to loosen the temperature sensor. Turn the ratchet or wrench counter clockwise until the sensor is loose enough to turn by hand. Unscrew the sensor and remove from the engine block.Check the temperature sensor for corrosion and the wire lead for damage. Replace the sensor and reconnect the wire lead. Start the engine and allow it to heat up to operating temperature. The cooling fan should come on automatically as the engine temperature increases.Use a gloved hand to squeeze the input hose for pressure. If pressure exists, it means that the coolant is flowing to maintain the engine operating temperature. Now check your engine temperature sensor or warning light to see if it is reading properly.

Mar 08, 2011 | 2004 Hyundai Santa Fe

1 Answer

The check enging light comes on then goes off. I foud out the code po118 engine coolant temp circut high input. is it the coolant temp sensor. if so how do I replace it. It is on a 2004 jetta tdi


According to Autozone.com:

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.



    Related Parts:
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Coolant Temperature Sensor printpage_icon.gif



0900c152801bfc38.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.

0900c152801bfc39.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown


0900c152801bfc3a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

Oct 17, 2010 | 2004 Volkswagen Jetta

1 Answer

How do i know my ETS is on on my 99 olds alero


IF YOU TALKING ABOUT ENGINE TEMPERATURE SENSOR.MOST OF TIME WHEN IT GOES BAD.YOUR ENGINE WILL OVER HEAT.COOLANT FAN WONT TURN ON.I SEEN A BAD COOLANT TEMPERATURE SENSOR CAUSE ENGINE STAY IN OPEN LOOP.CAUSE POOR ENGINE PERFORMANCE.FUEL CONSUMPTION.

Sep 22, 2010 | 1999 Oldsmobile Alero

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

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

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