Question about Hyundai Elantra

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I am checking the elantra temperature sensor. The resistance varies between 690 ohms cold and 96 ohms hot. What should it be? Also is there just one wire to it. System has been hacked a bit.

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Posted on Jan 04, 2009

localwonder
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SOURCE: temperature gauge not working,stay cold

Hi. the vdc at the sensor seems to be fine. if the ground is sufficient, i would replace the gauge. its malfunctioning. Check for loose connection at gauge before replacing the gauge.

Posted on May 14, 2009

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sensors maybe aftermarket or bad there very sensitive may haft to replace!!!!

Posted on Jun 22, 2009

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SOURCE: SL2 Won't start; previous codes=PO

I HAVE A 98 SATURN, WON'T EVEN TRY TO START EVERY ONCE IN A WHILE. TURNS OUT TO BE THE CRANKSHAFT POSITION SENSOR

Posted on Jul 22, 2009

  • 31 Answers

SOURCE: My 2001 Chevy S10 truck

Are you sure the coolant isn't heating up? I had the same issue once and the problem was i hadn't opened the high point vent on the cooling system. there for no liquid was getting to the sensor ie. it wasn't reading the true temp of the coolant. If that's not it try pulling the sensor out get enough slack in the wiring so you can get the sensor into a small pan of water. put scalding hot/boiling water in the pan have someone watch the guage put the business end of the sensor into the water and see if your temp rises. If not you were ether given the wrong sensor or a defective one.

Posted on May 16, 2011

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I have a 2000 crown vic and my coolant fan wont come on unless i cut the a/c on or unplugged the cylinder head sensor i changed thermostat and temp sensor it still same thing what could be the problem


You have a wiring problem from sensor to the PCM - engine computer .
DL22 CHECK CHT SIGNAL CIRCUIT FOR SHORT TO GROUND
    Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.
  • Disconnect PCM.
  • Measure resistance between CHT signal and SIG RTN circuits and then between CHT signal and PWR GND circuits at the PCM harness connector.
  • the PCM is what controls the cooling fan !
  • This Pinpoint Test is intended to diagnose the following:
    • Cylinder head temperature (CHT) sensor (6G004)
    • Harness circuits: CHT, VREF, and SIG RTN
    • Powertrain control module (PCM) (12A650)

    Tables and Graphs

    On applications that do not use a ECT sensor, the CHT sensor is used to determine the engine coolant temperature in place of the ECT sensor. In this case the PCM may store both CHT and ECT Diagnostic Trouble Codes (DTCs). To cover the entire temperature range of both the CHT and ECT sensors, the PCM has a dual switching resistor circuit on the CHT input. A graph showing the temperature switching from the COLD END line to the HOT END line with increasing temperature and back with decreasing temperature is included. Note the temperature to voltage overlap zone. Within this zone it is possible to have either a COLD END or HOT END voltage at the same temperature. For example, at 90°C (194 °F) the voltage could read either 0.60 volt or 3.71 volts. Refer to the table for the temperature to voltage expected values.
    Voltage values were calculated for VREF = 5.0 volts. These values can vary 15 percent due to sensor and VREF variations.
  • DL1 DTC P1288 OR P1116: CHECK OPERATION OF CYLINDER HEAD TEMPERATURE SENSOR
    • Run engine at 2000 rpm until engine temperature becomes stabilized.
    • No Starts or Vehicle that Stalls:
      • GO to DL3 .
    • Check that upper radiator hose is hot and pressurized.
    • Rerun Key On Engine Running (KOER) Self-Test.
    Is DTC P1288 or P1116 present? Yes No GO to DL2 . Engine temperature was not stabilized. REPAIR any other DTCs as necessary. DL2 CHECK VREF CIRCUIT VOLTAGE AT TP SENSOR
    • Refer to schematic at the beginning of this pinpoint test.
    • Disconnect throttle position (TP) sensor.
    • Key on, engine off.
    • Measure the voltage between VREF and SIG RTN circuits at the TP sensor harness connector.
    Is voltage between 4.0 volts and 6.0 volts? Yes No There is sufficient VREF voltage. RECONNECT TP sensor. GO to DL3 . GO to C1 . DL3 CHECK RESISTANCE OF CYLINDER HEAD TEMPERATURE SENSOR WITH ENGINE OFF
    • Disconnect CHT sensor.
    • Measure resistance between CHT signal and SIG RTN pins at the CHT sensor. Refer to the table at the beginning of this pinpoint test for resistance specifications.
    Is resistance within specification? Yes No For No Starts or Stalls, RETURN to Section 3 , Symptom Charts.

    All others, GO to DL4 . REPLACE CHT sensor. You need a scan tool to do some of these tests
  • DL4 CHECK RESISTANCE OF CHT SENSOR WITH ENGINE RUNNING
      Note: Verify that engine is at operating temperature before taking CHT readings.
    • Run engine for two minutes at 2000 rpm.
    • Measure resistance between CHT signal and SIG RTN pins at the CHT sensor. Refer to the table at the beginning of this Pinpoint Test for resistance specifications.
    • Key off.
    Is resistance within specification? Yes No REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). REPLACE CHT sensor. DL5 DTC P1289 OR P1290: ACCESS CHT PID AND CHECK VOLTAGE
    • Connect scan tool.
    • Key on, engine off.
    • Access CHT V PID.
    Is the CHT V PID less than 0.2 volt? Yes No GO to DL6 . GO to DL7 . DL11 CHECK CHT SENSOR SIGNAL AND SIG RTN CIRCUITS FOR OPEN IN HARNESS
      Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.
    • Disconnect PCM.
    • Measure resistance of CHT circuit between PCM harness connector pin and CHT sensor harness connector.
    • Measure resistance of SIG RTN circuit between PCM harness connector pin and CHT sensor harness connector.
    Is each resistance less than 5.0 ohms? Yes No REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). REPAIR open circuits. free wiring diagrams at www.bbbind.com

Jul 13, 2015 | Cars & Trucks

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ECT - Engine Coolant Temperature sensor


<p><b><span>2.2) <span> </span><u>ECT - Engine Coolant Temperature </u>(sensor)<u></u></span></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><b><span>What is it?</span></b><span> This is small electrical device for measuring the coolant temperature in the engine</span><br /> <p><span> </span><br /> <p><b><span>Where is it located?</span></b><span> It is usually located on the engine near to the thermostat housing.<span> </span>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.</span><br /> <p><span> </span><br /> <p><b><span>How does it work?</span></b><span> Modern temperature sensors consist of a thermistor in a sealed unit.<span> </span>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).<span> </span>When the engine is cold at start up the coolant sensor sends an appropriate signal to the ECU.<span> </span>The ECU responds by increasing the length of the injection cycles to enrich the combustion mix.<span> </span>This is an electronic equivalent of pulling the 'choke' out on a carburetor.<span> </span>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.<span> </span>The process of coolant sensor and ECU interaction explains why engines have a slightly faster idle when starting cold than when running hot.</span><br /> <p><span> </span><br /> <p><b><u><span>Symptoms of faulty coolant sensor</span></u></b><br /> <p><b><span>Associated OBD2 error codes DTCs: <span> </span>P0115 - P119; P0125, P0126, P0128</span></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <ul> <li><b><span>Poor starting</span></b><span> - If the coolant sensor reports in error that the engine is warm the ECU will not enrich the fuel mix at ignition.<span> </span>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.<span> </span>Once the engine has warmed up the engine will behave correctly.</span></li> <li><b><span>Fast/erratic idle, Poor fuel economy - </span></b><span>conversely if<b> </b>the coolant sensor reports in error that the engine is permanently 'cold' the ECU will keep the fuel mix rich.<span> </span>This is OK at start up but will become more noticeable when the engine is hot; idle will be fast and lumpy.<span> </span>Fuel consumption will be high due the permanently rich fuel mix set by the ECU.<b></b></span></li> <li><b><span>Excessive emissions - </span></b><span>the enriched fuel mix delivered in response to ECT signal error causes the exhaust to be heavy in un-burnt hydrocarbons.<span> </span>This often results in 'emission test' failure.<b></b></span></li> </ul> <p><b><span> </span></b><br /> <p><b><span>How to check? </span></b><span><span> </span>Most often the <b>coolant sensor</b> is quite separate to the <b>temperature sender</b>, so a correct read-out on the dash board does not necessarily indicate correct sensor function. Using<b> </b>a voltmeter the resistance across the electrical terminals on the sensor can be measured.<span> </span>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.<span> </span>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.<span> </span>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.</span><br /> <p><b><span> </span></b><br /> <p><b><span>How to fix?<span> </span></span></b><span>Replace if found faulty</span><br /> <p><span><br /></span><br /> <p><span><b>NEXT 3.1) CKP - Crankshaft position sensor</b></span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

My temperature gauge doesn't work on my 1990 Honda accord


Using an ohms tester, remove your temperature sensor and apply hot and cold water to it. If you find a difference in resistance, then refit it and replace your instrument temperature gauge

Sep 22, 2013 | Cars & Trucks

1 Answer

Radiator fans not working on a 99 dodge Grand Caravan


Hi there:
The engine coolant temperature sensor is a variable resistor with a range of -40 degrees F-265 degrees F (-5 degrees C-129 degrees C).


The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.


When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.


The engine coolant temperature sensor is also utilized for control of the cooling fan.


7_19_2012_5_08_13_pm.gif

Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines



Check this test procedure:

  1. Turn the ignition switch to the OFF position.
  2. Detach the coolant temperature sensor electrical connector.
  3. Using a DVOM set to the ohms scale, connect one lead to terminal A and the other lead to terminal B of the coolant temperature sensor connector.
  1. With the engine at normal operating temperature, approximaterly 200 degrees F (93 degrees C), the ohmmeter should read approximately 700-1000 ohms.
  2. With the engine at room temperature, approximately 70 degrees F (21 degrees C), the ohmmeter should read approximately 7000-13,000 ohms.
  3. If not within specifications, replace the engine coolant temperature sensor.
  4. Test the resistance of the wiring harness between PCM terminal 26 and the sensor wiring harness connector. Also check for continuity between PCM connector terminal 43 and the sensor wiring harness connector. If the resistance measures greater than 1 ohm, repair the wiring harness as necessary.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 18, 2012 | 1999 Dodge Grand Caravan

1 Answer

The car is a 4cl 1993 no spark.changed coil and igniter



  • Test the Camshaft Sensor
  • Check voltage between the camshaft position sensor terminals. With engine running, voltage should be greater than 0.1 volt AC and vary with engine speed.
ironfist109_393.jpg



  • Check the Crankshaft Position Sensor.
  • Using an ohmmeter, measure the resistance between terminals. Resistance cold should read 1630-2740 ohms and hot; 2060-3225 ohms.

ironfist109_394.jpg


  • Could also be a timing belt issue.

  • Make sure the distributor is spinning (rotor)




  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

Oct 13, 2011 | 1993 Toyota Camry V6

2 Answers

On my 2003 Dodge Neon SXT I need help with a couple of things. (1) I need someone to send me a diagram showing exactly where the coolant temperature sensor is and where the oil pressure sensor is. (2)...


2003 Dodge Neon (non-Turbo)

The coolant sensor threads into the rear of the cylinder head, next to the camshaft position sensor. New sensors have sealant applied to the threads.

The ECT Sensor is a Negative Thermal Coefficient (NTC), dual range Sensor. The resistance of the ECT Sensor changes as coolant temperature changes. This results in different input voltages to the PCM. The PCM also uses the ECT Sensor input to operate the low and high-speed radiator cooling fans.

11_21_2011_4_58_53_am.jpg

The combination coolant temperature sensor has two elements. One element supplies coolant temperature signal to the PCM. The other element supplies coolant temperature signal to the instrument panel gauge cluster. The PCM determines engine coolant temperature from the coolant temperature sensor.

As coolant temperature varies the coolant temperature sensors resistance changes resulting in a different input voltage to the PCM and the instrument panel gauge cluster. When the engine is cold, the PCM will provide slightly richer air-fuel mixtures and higher idle speeds until normal operating temperatures are reached.

The PCM has a dual temperature range program for better sensor accuracy at cold temperatures. At key-ON the PCM sends a regulated 5-volt signal through a 10,000-ohm resistor to the sensor. When the sensed voltage reaches approximately 1.25 volts the PCM turns on the transistor. The transistor connects a 1,000-ohm resistor in parallel with the 10,000-ohm resistor. With this drop in resistance the PCM recognizes an increase in voltage on the input circuit.

Oct 11, 2011 | Cars & Trucks

1 Answer

My 2002 Dodge Caravan seems to be a bit sluggish, then all of a sudden the temp gauge shoots up and it's hot. We just replaced the water pump and thermostat.


check the coolant temperature sensor. the sensor is located right next to the thermostat housing. it has only two wires, disconnect plug. using a ohmeter check the resistance between the two terminals on top of the sensor when cold. resistance should be 7,000-- 13,000 ohms. check again when the engine has wormed up to about 200 degrees. the resistance should be 700--1,000 ohms. if there is not a definite change in the resistance, then remove and test in a pan of hot water. if the test is good, check the wiring harness from the sensor to the pcm.

Apr 12, 2010 | 2002 Dodge Caravan

1 Answer

2000 maxima has erratic idle on cold days and will stall out on extremely cold days. Also, have noted antifreeze leak (on ground) on those really cold days. Car runs fine once it reaches normal operating...


It sounds like an engine temp sensor is open.. When your engine is cold or anti-freeze is cold your ECU or ECM gets a signal from the temp sensor for cold engine start. It would make sense that it works fine when hot because the resistance on the sensor is a lot lower. Take an ohm meter if you have one and check the resistance across the temp sensor pins. When the engine is cold the resisitance should be really high. Start and warm up your car to normal temp and check it again. It should be a lot lower now. If not replace it. Hope this helps.

Sep 24, 2009 | 2000 Nissan Maxima

2 Answers

Engine code p0115


replace the sensor and or check the wiring socket going to the sensor

Jun 02, 2009 | 2001 Hyundai Elantra

2 Answers

Coolant Temp sensor


The coolant temperature sensor should read at approx 1,800 ohms between 68 and 88 degrees F. As the temperature lowers, the resistance rises. More ohms. As the temperature rises, the resistance lowers. Less ohms. At 210 degrees, the ohms would be about .15 K ohms.

The 89 and the 12 figures are wrong.

Jan 17, 2009 | 1992 Toyota 4Runner

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