Trouble Code 15 indicates that the Coolant Temperature Sensor (CTS) is reporting abnormally low readings. thats not a valid measurment, it would say zero ohms. At a little above room temperature, I measured 750 ohms. I probed the sensor and the resistance values are right on par with what they should be. Here are more specifics: 1. sounds like we may be refering to two different gauge systems. Does anyone know if the resistance values for the CTS(Coolant Temp Sensor) in the lower rad hose are the same as the ETS(Engine Temp Sensor) in the cylinder head? PCM is bad. 1. I tested the voltage on a cold motor on the coolant temp sensor circuit: 3.3v (equivalent to about 55 or 60 degrees) With a 150ohm resistor: .45v (equivalent to well over 200 degrees, aka which would turn the fans on) At the relay, there is a coil part and a … The coolant temperature sensor must be a Negative Temperature Coefficient (NTC) thermistor. The old one did seem to kick out a resistance inverse to temp as car warmed up, but values were weak or slow....so the story is even if you know range, an old sensor that seems to work, just doesn't. Measure the resistance between ECT sensor No.2 terminals A and B. 40----- 2275. ECT resistance chart Access our Volkswagen Cars 2000-05Testing Repair GuideA1 and A2 Platform by creating an account or signing into your AutoZone Rewards account. Today at 3:43 PM. Oxygen Sensor Testing. The Coolant Temperature sensor is critical to many PCM functions such as fuel injection, ignition timing, variable valve timing, and transmission shifting. The mapping table within the ECU interprets the resistance value as engine coolant temperature. 86ers said: Actually replaced the sensor, and it fixed the combustion problem. The engine coolant temperature sensor uses a changing electrical resistance value to measure the engine coolant temperature and relay this information to the onboard computer. I sold my old 170 I-6 long time ago and I don't know what temp sender it had so I don't know the resistance values. Value at nearly cold iron- 9k ohms Value at nearly normal operating temp- 352 ohms The sensor itself seems to be fine, so I've ruled that out. Compare the readings with the downloaded table. The ECTS uses a thermistor that changes resistance with the temperature. At 73 Deg F, the resistance I have is 318 ohms for both Motorcraft 270. Compare the readings with the downloaded table. To get a better idea of the relationship between coolant temperature, sensor resistance, and the temperature it reflects, I repeated the "simulation" approach, but this time recorded the resistance of the variable resistor at a number of temperatures indicated on … F., the resistance will be about 200 Ohms. 43,291 Posts. 2014 M8000 LTD. The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The coolant temperature sensor itself is often quite cheap and you can often find them around 40$ for a quality one. Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant. Since you said that the normal operating range was 0 - 10k ohms, I unplugged it from the wiring harness and checked it with an ohm meter when it was cold, then ran the engine to normal operating temperature. At a little above room temperature, I measured 750 ohms. Air temp sensor is giving me a reading of 9 – 10 Kohms while running with an outside temp of 17, engine is warm, i can touch the heatshield / block and head with my hand, oddly enough, and not surprisingly, the car is running lean. F., the resistance will be over 10,000 Ohms. The coolant temperature sensor converts the temperature of the coolant and therefore of the engine oil into an electrical value (resistance). Coolant temp sensor is bad. At first I didn't get a reading. HOW TO TEST COOLANT TEMPERATURE SENSOR. either way its important for … However, you can also research online to find out the resistance value for your temperature sensor since this usually depends on the brand of the sensor. Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant. Open the Tools menu and select Calibrate Thermistor Tables: The sensor selected will be the Coolant Temperature Sensor. The internal resistance of a coolant sensor can also be checked with an ohmmeter or DVOM (digital volt ohm meter) and compared to specifications. The Temp indicated by Ibeat was 28'C or 82.4F. The computer then determines the temperature of the vehicle by reading the voltage accross the sensor. When the sensor is cold, the resistance of the sensor is high, and the voltage signal is high. The old one did seem to kick out a resistance inverse to temp as car warmed up, but values were weak or slow....so the story is even if you know range, an old sensor that seems to work, just doesn't. On the Spi its range of resistance vs temperature is as follows. Your ECT are dirty, The engine coolant temp sensor was definately checked by the mechanic. The coolant temperature sensor itself is often quite cheap and you can often find them around 40$ for a quality one. 3. Coolant Temperature Gauge. CODE 15 - Coolant Temp Sensor Circuit. You will search for the sensor within the engine block itself, using a drop light if you need help to see it better. If I remember correctly, there's a table in one of the electrical troubleshooting chart. As the coolant temperature changes, so does the resistance of the sensor. Most (ECT) sensors operate using electrical resistance, to measure the temperature of the coolant. I need the values from that chart: The temp/resistance figures. Physically inspect sensor for damage. Place the ECT sensor No.2 in water with a thermometer, and heat the water gradually. This DTC indicates one of several things: Check temperature transmitter. Any CarIn this video we will demonstrate how to test coolant temperature sensor on any car. Does anyone knows is resistance of coolant temperature same for M14 and M16 sensors? The ECM supplies 5 volts to the coolant temperature sensor circuit. Temperature Sender: Room Temp (Sender Dependent) 300 – 1000 Ohms (•) Pressure Sender: Engine off (Sender Dependent) 10 Ohms (•), 240 Ohms (•) Title: Created Date: The PCM applies a voltage (about 5.0 volts) on the signal circuit to the sensor. As a rough and ready guide engine coolant temp sensors usually drop to a tenth of the standard temp value at 20 degrees C when the engine is running at optimum temperature. Hint: When any of dtcs p0115, p0117 and p0118 are set, the ecm enters fail-safe mode. The thermistor used has a high resistance when cold, lowering as the coolant warms. The engine temperature signal is used by the engine control module to adjust the air/fuel mixture and ignition timing. 1. I just want to make sure that I get an decent coolant temp reading on … The tip of the (ECT) sensor protrudes into one of the cooling system passages; and is immersed in coolant. The ECU reads the voltage at the junction of the bias resistor and the temperature sensor to determine its resistance value (and thus the temperature). Contact the experts 01246 261999 / websales@peaksensors.com. Test faulty resistance thermometer with a multimeter. 86ers said: Actually replaced the sensor, and it fixed the combustion problem. Drain the engine coolant.. 4. The coolant temperature sensor, also known as the coolant temperature switch, is an engine management system sensor that is used to monitor the temperature of the engine’s coolant.Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant. P.S. For room temperature, which is about 68 °F, it should read about 2.5K ohms. as temp goes up, resistance of the sensor goes down , which yields higher current, which inturn increase the deflection of the needle on the gauge. Some glancing online suggests some things I could do if the thing is plugged in and I can run the car, but the sensor's out and the car won't start. I have the removed the coolant temperature sensor for my 1998 Passat, 1.8L turbo. The coolant temperature sensor is located on the engine block under the hood. the gauge is connected in series between a voltage regulator and a grounded temp sensor. Disconnect the engine coolant temperature gauge sensor located on the left side of the engine above the starter. The coolant temperature sensor monitors coolant temperature and then displays the measurement to the vehicle’s occupants. P0118: Engine Coolant Temperature (ECT) Circuit High Input. With current Mid-Atlantic garage temperatures (room temp) the sensor should read between 2500-2700 ohms. I could find some values from Mercruiser Service Manuals, Teleflex and Faria documents, etc, listed below, but, as you can see, those values are rough, sparse and in the wide range. Some glancing online suggests some things I could do if the thing is plugged in and I can run the car, but the sensor's out and the car won't start. The resistance of the ECT sensor at 194 degrees F is 241 ohms Basically, I'm concerned my ecu may be bad and shorting the coolant temp sensor internally and causing the ecu code 22 to throw. I would check the coolant temperature resistance at that temperature, since it has greater relevance. This indicates how much heat the engine is giving off. Ohms readings on 20K Ohm scale on digital Fluke meter and all three sensors in the shop and up to shop temp of 70°F tested on the tip of all three to verify the same temp with the IR temp gun. Using a Digital Volt Ohmmeter (DVOM), measure the voltage from the connector to ground, normal value is Battery Voltage (about 12.4V). And thats for the 'engine compartment, cooling fan' not the coolant temp sensor. An ACDelco GM Original Equipment Engine Coolant Temperature Sensor monitors the engine temperature, and is a GM-recommended replacement for your vehicle’s original component. Im trying to find senders resistance values for pressure and temperature senders. (2.5xx - 2.7xx Kohms) Next, run the bike for a while and repeat the resistance measurement. I need the resistance values across the range for the temperature sensor unit. Temp sensor If I hook up my VAGCOM up and go to measuring block 7 the temp value on the screen right should be the coolant sensor. These 5 Volts are created inside the PCM. If it's the same resistance readings as the ECTsensor then, it's implying the air temperature is around 50 C. The air temperature was about 39 F when I started and the car was cold. The sensor is a thermistor which changes internal resistance as temperature changes. temperature (°c) sensor resistance (ohms) unloaded resistance vs temperature characteristic chart-1.5-1.0-0.5 0.0 0.5 1.0 1.5-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 temperature (°c) accuracy (°c) temperature accuracy chart To get a better idea of the relationship between coolant temperature, sensor resistance, and the temperature it reflects, I repeated the "simulation" approach, but this time recorded the resistance of the variable resistor at a number of temperatures indicated on … Touch the probes to the pins in the coolant sensor. The ECT sensor has a signal circuit and a ground circuit. The Temperature on Ibeat indicated 207.5'F or 97.5'C. The resistance depends on the actual temperature surrounding the sensing element. As the temperature increases, the resistance is reduced, which reduces the voltage at the sensor. Looked up in the manual and noticed that it is measured in K ohms (1000).....duh, I should have checked that first. I found the water temp sensor values to as such WATER TEMP CELSIUS RESISTANCE OHMS 50 … The resistance values should be in range of the table values. The resistance of a normal sensor to ground will vary a little depending on the vehicle, but basically, if the temp of the engine is around 200 deg. Well, it's becoming clear that if your V-12 powered Jaguar suddenly dies on the road without warning when it is warm, but happily restarts after a short rest, you might be suffering from an intermittent open circuit in your Coolant Temperature Sensor. 30 degrees F is 2238 ohms and the resistance valve of the ECT sensor at 40 degrees F is 1459 ohms. A Coolant Temperature Sensor Emergency Switch. Also you can check the resistance of the sensor to ground using an Ohm meter. After sitting overnight I think it should read ambient temp as should the air and fuel temps. ... Alternatively, check the surface temperature on the block near the DME temperature sensor. The ECT sensor has a signal circuit and a ground circuit. This means that it is a resistor whose resistance decreases as its temperature goes up. A cold engine requires more fuel. Change your multi-meter to resistance measurement, Ohms or K Ohms. To do this, a resistance with negative temperature coefficient (NTC) is used. Most sensors of this type have a resistance value of 3000 ohms or more at about 55F (13C). 2. I certainly could build different types. This is normal (or the car has always done that). I'm finishing up an M54 into an E36 swap and because I'm retaining the stock fan control I need a radiator outlet temp sensor signal for the DME. These figures support your diagnosis that CTS is faulty. If the resistance of a coolant sensor is within specifications and changes as engine If not as specified, replace the ECT sensor No.2.. Specification (2.5xx - 2.7xx Kohms) Next, run the bike for a while and repeat the resistance measurement. One is the power wire and this power is in the form of 5 Volts. These values don’t take into account the wiring in the loom and the corrosion on your connectors. The resistance difference of the ECT sensor for the 10-degree F change is 779 ohms, which is substantial when compared to the resistance change at normal engine operating temperature. 69/70 is more like an ammeter system. The online version of the CD-ROM manual can't be opened properly. Before electronic fuel injection, the temperature sensors were used mostly to drive gauges or 'idiot lights', rather than control the engine. When the coolant is hot the sensor should have a lower ohms reading. A coolant temperature sensor costs 30$ to 100$, and the labor costs 20$ to 150$. The image below shows the results. To test the sensor, you can remove the electrical connector and check the resistance value of the sensor and compare it … Compare resistance to the value in the table below. First change is the thermostat. The PCM applies a voltage (about 5.0 volts) on the signal circuit to the sensor.

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