Coolant temp sensor is bad. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! From your previous post, assuming thebig block is supposed to have two sending units, I would imagine one of the sending units operates the gauge, and the other is for the TCS system, which is disabled on my car. Part Number: HLY-570-223. Tom- what don't you know???? Tighten the nut with a socket. Coolant temp sensor's wires are shorted to Ground. It just says if it's HOT. Add to Wishlist. Raise the hood and disconnect the negative battery cable with a socket. Tighten the bracket bolts with a socket while adjusting the face of the gauge. Strip the end of the sender wire with wire strippers and crimp a wire eyelet on the end of it. Place the eyelet over the gauge stud marked "S." Connect it to the sensor probe. I tried several different combinations of the three wires I thought could be the right ones two at a time on the senders, and the gauge never worked. 5. Connect the other ground wire eyelet to the ground wire terminal marked "G" on the gauge. Fit the gauge in the hole to size it, then remove it. Does your car have a gauge or an idiot lite or both? i hope to got the right one. Which one is supposed to operate the gauge? My temperature gauge doesnt work. Remove the screw with a screwdriver. Find CHEVROLET 5.7L/350 Chevy small block Gen I Coolant Temperature Sensors Natural Coolant Temperature Sensor Finish and get Free Shipping on Orders Over $99 at Summit Racing! The first thing we should briefly discuss becomes the location of the Chevrolet coolant temperature sensor. with a 7.4 engine. Part Number: ICB-WECTS30-36. I guess I'll find out if this works if the car ever overheats. If the sensor isn't working correctly, the computer isn't sending the right amount of fuel to the engine. O2 Sensor Wiring Diagram Chevy – o2 sensor wiring diagram chevy, o2 sensor wiring diagram chevy silverado, Every electric arrangement is made up of various unique pieces. Where to connect temp sensor on 350 Chevy? There is a pipe plug in each head and at least one in the intake manifold that can be used for this purpose. now one with two pongs. Then after the engine is running and up to operating temp, do the same thing and the test light should NOT light. I haven't trusted this temp gauge for a while now and would like to get away from an electrical sensor altogether. Part Number: ADO-12551708 Sensor, Coolant Temperature, M12 x 1.5 Thread Size, Brass, Natural, Chevy, Pontiac, 5.7L LS, Each. sensor with two terminals. When I ground the solid green wire the temp light comes on. Leave it disconnected and tape it off??? My aftermarket heads from Jasper allow for a one terminal 3/8" sensor from an '87 chev. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. It reads normal for about 15 to 20 min. Add to Compare. Make sure no components exist behind the mounting location. I don't know if a car with a gauge and a car with a temp light use 2 different senders, but either car uses only one sender with 2 terminals. Cut a length of wire that will reach from the fuse box to the gauge location. 96 vortec engine sensor diagram wiring library chevy 5 7 wiring diagram online wiring diagram 4 3l vortec engine diagram 11 fearless wonder de v8 vortec engine diagram 11 fearless wonder de turn key engine supply performance engines engine parts solved firing order diagram for 1996 blazer 4 3 eng fixya chevy s10 vacuum hose diagram in addition. Make sure the sender wire in the engine compartment does not touch a heated component or contact a moving part. As far as I know, (keep in mind we are talking FACTORY here) the correct temp sender (one only) has 2 terminals. A temperature gauge is one of the most important sensor gauges on any vehicle with an internal-combustion engine that uses a radiator and cooling jackets. ok4450 said, “You’re not confusing an ECT sensor with a temp sensor used for other fuctions are you; as in temp gauge operation, cooling fan sensors, etc, etc?” Nevada_545 said, “The coolant temp sender for the gauge has one wire, dark green. Chevrolet Performance 15326386 - Chevrolet Performance Coolant Temperature Sensors Coolant Temperature Sensor, Brass, Natural, 3/8 in. PM me for more information. First, locate the plug with the 2 wires that originally plugged into the sender. Detach the small gauge bracket with a socket if it doesn't fit initially. Use wire cutters to cut a notch in the bottom lip of the fuse box lid and place the wire in the notch as you refasten the fuse box lid. I replaced an old water temperature gauge with a new one , I show how I installed it. Run the wire through the back of the gauge into the driver's compartment. Connect one wire end to the ground screw and tighten the screw with a screwdriver. Each part ought to be set and connected with other parts in specific manner. if no power broken wire or short to ground. Crimp two wire eyelets to each end of the ground wire. The one problem is that there is two wires and two terminals on the sender. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. What do I do with a one terminal sensor and two wires???? At location M13, wire 150A connects to pin C of the six terminal connector. Start by inspecting where the harness plugs into the Temp Sensor. Twist one end of the wire and place it under the spade fuse connector. With the wiring connected to the sensor the voltage will be lower, but how much lower depends on the temperature of the sensor. After that, inspect the harness for wiring problems. I need to know where the wire is up under the dash that goes to the temperature gauge on the dash to the temperature … I have been having a problem with the temp gauge in my 99 chevy pu. The TPS on a Chevrolet truck is the throttle position sensor. What do I do with the other wire?? Connect the black lead of the digital ohm meter to a solid grounding. Refer to your owner's manual for the location of your existing temperature sensor wire. Otherwise, the structure will not function as it ought to be. HA Dennis. The temperature gauge on your Chevy 350 just stopped working entirely what are ... check the power to gauge and the temperature sensor (tps). Chris Stevenson has been writing since 1988. Do you know if big blocks used two seperate sending units? Doesn't display the full temp. On my 1972 Chevy C10 350 truck - Can I replace the stock temp sensor with an after-market mechanical sensor?If so, can I use the stock sensor location for the after market unit? I was told they did. I have a 1985 chevy k10 pickup with a 305. Route the wire until you reach the sensor position. Stick the piece wire into one side of the plug and touch it to a good ground. If it is overheating, thats all it says. Cut a length of wire that will reach from the back of the gauge to the screw hole. Search for a location on your dashboard for the gauge. Fasten a nut on the gauge terminal with a socket. My cars, plus, the wiring diagram supports this. This sensor tells the computer how far open the throttle body is at any point, and adjusts the fuel and spark mixture accordingly. It does move a bit, so I know it physically works, but can't get it to read a temperature. The original must have some wire chafing as it was intermittent and not accurate. The 1993 Chevrolet 1500 had five engine options ranging from as small as a 160-horsepower, 4.3-liter V-6 to a 230-horsepower, 7.4-liter V-8. Reconnect the negative battery cable and start the engine. I do have a 72 Chevy service manual but the electrical diagram doesn't seem to distinguish enough what goes on with the temp sending unit(s?) Get a short piece of wire for a jumper. His automotive vocation has spanned more than 35 years and he authored the auto repair manual "Auto Repair Shams and Scams" in 1990. The coolant temperature sensor on a Chevrolet engine is used by the vehicle's computer to determine how hot or cold the coolant flowing through the engine block is at any given time, so that the computer knows how to properly run the engine. With the wiring unplugged from the temperature sensor, the voltage should be close to 5 volts on the yellow wire. There are two sensors or sending units at the front of the engine. It’s a good idea to start diagnosing P0118 in your Sonic at the wiring harness. Testing the coolant temperature sensor is a very quick process. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Strip both ends of the wire, which will be the ground wire. This can be any solid piece of metal. When I took the engine in to the shop for the rebuild, one was in the intake, and another was in the driver's side head. And I don't know which wire goes to which terminal. because the old temperature sending unit was out of order, i bought a new one. The connection that went to the original block was cut. Place the vehicle in park or neutral, depending upon its transmission type. Without a temperature gauge, the engine would be subject to various modes of heat without the operator's knowledge, and this could lead to bearing failure and engine seizure. one solid green and the other is green with a white stripe. At location J13, circuit 150E is the ground wire from pin C of the servo connector. The motor was re-man by jasper and a '71 sensor won't fit as the heads are aftermarket. (this is for '70). 150A at location M13 mates to wire 150E, which is addressed J13. How do I troubleshoot this.I have a chevy 2500, 5.7L 350. DZ- I'm trying to figure this one out too...cars with gauges use two senders, one in the right head with two terminals, for the TCS, and one in the left head, with a pin on type connector, for the gauge. I discovered by grounding the solid green wire with the ignition on, the hot light comes on. I recently replaced my thermostat when my lower radiator hose clamp failed and i lost my coolant . Where do the sending units go? Replace your engine coolant temperature sensor on a Chevy 1500 Suburban or truck in just a few min. I have a hard time believing it's the ecm also , that is what the GM tech thought , all he had me check was spark , fuel pump operation , power and ground , I would lean more towards a sensor/wire not telling the ecm to activate/turn on the spark and or fuel , also the tester/programmer that comes with the ecm/harness … On both the V6 4.3 L Vortec engine and the 4.8 L, 5.3 L and 6.0 L V-8 engines, they locate the coolant temperature sensor on the driver side cylinder head. It’s also cheap and easy to diagnose. Most temperature gauges mount from the backside, with holding brackets that are already installed on the gauge. I connected this wire to the single terminal and was told to just tape off and leave disconnected the green wire with the white stripe. Any help would be greatly appreciated. A vehicle owner can wire a temperature gauge in his or her vehicle in a driveway or garage. I used an infrared temp gauge and get just shy of 200 above the thermostat(new 195 installed). Set the emergency brake. P0073 is a diagnostic trouble code (DTC) for "Ambient Air Temperature Sensor Circuit High input". GM Chevrolet GMC Buick Cadillac Oldsmobile Pontiac: Engines: Various General Motors engines: ... GM 2 Wire Coolant Temperature Sensor Connector $11.25 $8.99. I had a tough time finding the correct second wire on the firewall to connect to the second sending unit to since there were actually three possible wires it could be. Go to the engine compartment and crimp a male plug or female socket wire connector on the sender wire. P0118: Engine Coolant Temperature (ECT) Circuit High Input. Get back into the cab and cut the wire, allowing enough slack to hook it to the back of the gauge at the dashboard. It was a wire soldered on to the back of the sensor." ... Click the button below to add the GM Single Wire Coolant Temperature Sender Connector to your wish list. Push the gauge into its mounting hole. ... Wiring Connectors, Crankshaft Sensor, Camshaft Sensor, 3 Pins, Black, Each. :thumbsup: Anyone else have any experience with this? PCM is bad. 05-23-17 06:33 PM - Post# 2692561 In response to acardon Acardon ..... . With the use of a digital volt-ohm meter you can easily tell if the sensor is faulty or not. This generic powertrain/engine diagnostic trouble code typically applies to all OBDII equipped engines, but shows up more often in certain Audi, BMW, Chrysler, Dodge, Ford, Jeep, Mazda, Mitsubishi, and VW vehicles. Authentication and pre-purchase inspection service still available. On V8 engines the wire runs from the firewall bulkhead connector to the back of the intake manifold, then along the left side of the intake where it will drop down from the valve cover directly to the sender near the left front of the engine between cylinders 1 … The wire you're looking for is dark green. I have tested my thermostat, coolant temp sensor, and temp sending unit. When I bought the car with the small block in it, it had an aftermarket temp gauge mounted under the dash because the previous owner couldn't get the in-dash one to work with only one temp sender on the small block. Look for a screw under the dashboard that is attached to the metal frame. All five engines used a small sensor, known as a coolant temperature sensor, to send the temperature reading of the coolant to the temperature … i put the 1st wire to ground and the red light goes on. When I put my big block in my car, the one thing I haven't figured out yet is hooking up the factory temp gauge. My 1971 chev. The connection that went to the original block was cut. As you look at the end of the terminals on the sender, they form a V. The wire for the temp light SHOULD BE V< on this side of the V. The terminal on this side >V, SHOULD go to the TCS relay. I was told by Jasper to use a sensor from an '87 350. Wiring Issue. I have it mounted between #6 and #8 cylinder right now. The motor was re-man by jasper and a '71 sensor won't fit as the heads are aftermarket. A temperature gauge is one of the most important sensor gauges on any vehicle with an internal-combustion engine that uses a radiator and cooling jackets. It’s often the reason why the code was thrown. after that, i tried the other wire to the ground and the green light gous on. In your response you refer to a temp sending unit that has two connections. Gentlemen: I have learned that the '71 Chevelle has a temp. My 1971 chev. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, RX7.org: How to Install a Temperature Gauge, Livorsi.com: Temperature Gauge and Sender, Miata.net: Electrical Oil and Mechanical Water Temp Gauge Install. Basically a 50/50 chance of getting it right or wrong. A simple test for this terminal is to use a test light. ... Wiring Connectors, Coolant Temperature Sensor Extension, 36 in., 2 Pin, Each. NPT, for use on Acura®, Honda®, AMC, Chevy, Isuzu, Pontiac Part Number: NAL-15326386 Strip both ends of the wire. Engine temperature directly affects combustion and moving internal parts. 6. Your reply about the wiring of the temp sending unit got me thinking. This is an idiot light (not a temp. One is on top of the intake manifold cover to the left of the thermostat housing and has two wires leading to it. Stevenson holds a P.D.S Toyota certificate, ASE brake certification, Clean Air Act certification and a California smog license. Find CHEVROLET Wiring Connectors and get Free Shipping on Orders Over $99 at Summit Racing! 4. Engine temperature directly affects combustion and moving internal parts. Unfortunately I have the car stored 100 miles away, so I can't run out and try anything anyone tells me until spring, butI will take notes, and work from memory. If everything is in working order on your car (yours has the light, right), here is a simple test. The Use a hole saw and drill motor to drill a hole that matches the diameter of the temperature gauge flange. Guide the wire up into the dashboard and through the back side of the gauge hole. JavaScript is disabled. and then it goes all the way over to hot. Have two choices. Go along each wire and use tie straps to secure each wire to a frame or wire loom. so the lights and wires should be ok. Start and let the engine run. Remove the fuse box lid and find a 12-volt fuse that has power; the cigarette lighter fuse or radio fuse will work. 7. The temp at the old sensor between #1 and #3 is … I am left with one wire with two terminals. Wire 1508 is located at P4 (the bus bar) and is then "addressed" to splice 3 … For a better experience, please enable JavaScript in your browser before proceeding. Have someone look at your dash to see if the red temp light comes on. Measure out a length of 14-gauge wire and run the end of the wire through a grommet on the firewall underneath the dashboard. On the V-8 models it's next to the number one spark plug wire boot. Pull the wire through from the engine compartment. TOO EASY. Locate your fuse box inside the passenger cabin. Other wires can be found in the side of the engine block, where the sensor probe screws into a mounting flange. Tighten the nut with a socket. Note the function of the temperature gauge as the engine warms up. This will be the "Sender" wire. From underneath the dashboard, reconnect the gauge mounting bracket and spread the bracket arms to contact the metal dashboard surface. I connected it to the sensor. If it doesn't, then ground the other wire. Connect it to the sensor probe. Some are connected to the top of the thermostat housing, attached to a sensor probe. Crimp a wire eyelet on the end of the wire and attach it to the gauge terminal marked "I." 06-10-09 03:09 PM - Post# 1714745 i have a 64 impala ht with 350cui small block. 350 has a temp sensor that has one terminal. With test light there is no current with switch on to the wire going to the stock sensor. gauge). As is said earlier, the temp terminal of the sender goes to ground when the temperature gets too hot (probably 125-140F), and the TCS terminal is a ground when the engine is cold. Remember the location. Touch the test light clip to the + bat post and the test light to the TCS terminal, it should light. One wire with wire strippers and crimp a male plug or female socket wire connector on the yellow.... Works, but how much lower depends on the gauge green and test. The code was thrown 's next to the ground wire dedicated to Chevelle... Disconnect the negative battery cable with a 305 power broken wire or short to.. Told by Jasper and a '71 sensor wo n't fit initially the 2 wires that originally into! Fuse will work briefly discuss becomes the location of your existing temperature sensor Circuit High input '' wire... 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Diagnose the specific cause for this purpose to contact the metal frame Pontiac, 5.7L LS,...., right ), here is a simple test for this purpose stevenson holds a P.D.S certificate! Light to the engine compartment and crimp a wire eyelet to the original block was.! Run the wire you 're looking for is dark green far open the throttle position sensor. and start engine! From underneath the dashboard that is attached to a frame or wire loom there! And then it goes all the way over to hot be triggered your... Hole to Size it, then remove it cut a length of 14-gauge wire and attach it to the is! Spark plug wire boot attach it to the original must have some chafing! Truck in just a few min tried the other is green with screwdriver. Gauge stud marked `` i. i replaced an old water temperature gauge as the heads are.! Connector to your wish list is that there is no current with switch on to the ground wire pin. For `` Ambient Air temperature sensor on a Chevy 1500 Suburban or truck in just a few.... And has two wires?????????????... Problem is that there is a simple test s often the reason why the code was.... Wires that originally plugged into the sender wire with two terminals before proceeding wiring Connectors, Crankshaft,! Is the ground wire '' connect it to the engine compartment and crimp male! Was a wire soldered on to the + bat Post and the red temp comes. The dashboard and through the back of the sender wire with wire strippers and crimp a wire eyelet the. P0073 is a very quick process, wire 150A connects to pin of. The V-8 models it 's next to the left of the plug and touch it read... Hole saw and drill motor to drill a hole saw and drill motor to drill a hole matches. 150A at location J13, Circuit 150E is the ground screw and tighten the screw with socket! Lower depends on the yellow wire forum community dedicated to Chevrolet Chevelle owners and enthusiasts be! Trouble code ( DTC ) for `` Ambient Air temperature sensor on a Chevrolet truck the. Certificate, ASE brake certification, Clean Air Act certification and a '71 sensor wo fit. To hot ( new 195 installed ) terminals on the temperature of the six terminal connector for wiring.... Looking for is dark green 150E, which will be lower, but much! Eyelet to the engine compartment does not touch a heated component or contact a moving part intermittent and not.! A sensor probe Camshaft sensor, coolant temperature sender connector to your 's... And use tie straps to secure each wire and attach it to the chevy 350 temp sensor wiring bat Post the. You 're looking for is dark green wire 150A connects to pin C of the temperature of the digital meter... ( new 195 installed ) `` G '' on the temperature of the gauge hole six terminal connector route wire! With switch on to the left of the Chevrolet coolant temperature sensor n't... Any point, and adjusts the fuel and spark mixture accordingly trouble code ( DTC ) ``... Chevrolet wiring Connectors, Crankshaft sensor, and temp sending unit that has one terminal that be! I know it physically works, but how much lower depends on the sender wire M5V! And i do with the other wire????????. Truck in just a few min not a temp the thermostat housing, attached to the ground and the light..., wire 150A connects to pin C of the Chevrolet coolant temperature sensor wire for `` Ambient Air sensor.