TDI. The temperature sensor bein

2022.07.31
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TDI. The temperature sensor bein

TDI. The temperature sensor being used is a DHT11/ DHT22 /AM2302. 3. A reference voltage means the ECU provides the voltage to the sensor. ECT Sensor Wiring Diagram: the Owner of This Car Make a Jumper Ls1 Coolant Temp Sensor Wiring Diagram - Free Wiring Diagram. We will also be using the bcm2835 C library to assist in reading the digital outputs from the sensors. It is very important that each of the three wires used in the measuring circuit are equal in terms of both conductor size and length. rtd wire sensor temperature apcs The signal wire means the MAP sensor sends the Output rtd daq Here's a brief description of the throttle position sensor (TPS) circuits: Wire that feeds the TPS with 5 Volts DC from pin 90 of the PCM. In my case, I will use 3.3 volts. The frequency therefore ranges from 8.8 kHz (at 30 C) to 15.7 kHz (at +150 C). Choose from full wiring harnesses, separate system harnesses (like Halogen headlight. Power supply. In a 4 wire RTD the actual resistance of the lead wires can be determined and removed from the sensor measurement. Here is a wiring diagram of a PNP sensor. Shares: 265. Ground signal wiring shield at the power supply end. If you have access to a wiring diagram it should be easy to tell whats what. The addition of a third wire, connected to one side of the measuring element, helps to compensate for the lead resistance. There are 2 wiring methods for the RTD module and PT100 temperature sensors two-wire and three-wire connections. Only show this user. A 4 wire oxygen sensor wiring diagram is also called universal O2 sensor wiring. A four-wired oxygen sensor has four wires, two wires for the heater circuit and two wires are for the sensing element. The sensing element wires go to the PCM, in which one wire is signal ground and the second wire is signal voltage. Damaged or loose wiring connections. 4 Pin Mass Air Flow Sensor Wiring Diagram 4 Pin Mass Air Flow Sensor Wiring Diagram. Details of RTD Wiring configurations for 2 wire, 3 wire and 4 wire RTD Sensors. The actual wiring between the transmitter and the power supply depends upon whether it is a 2-wire or a 4-wire type. The 3 wire speed sensor is externally powered, so you will need a power source of some form. Ground the transmitter: option 3. In our case, the PLC input will be our load. [citation needed] Sensor wires provide a feedback signal such as specified by the SAE J1772 and IEC 62196 schemes that require special (multi-pin) power plug fittings. The engine coolant temperature sensor converts the engine coolant temperature into a voltage signal, and inputs the voltage to the engine-ECU. They are available with different wire configurations; 2 wire, 3 wire and 4 wire. 3-wire 4-wire. The W heat wire control could also activate Damaged or loose wiring connections It is normal for a temperature gauge to take a few minutes to register, so unless what you are seeing is not the normal behavior for an Impala, the The rest of the connectors will fall into sequence If resistance does not match the RTD chart The diagram below shows the typical wiring for these sensors. 3 wire Sensor These rare coolant temperature sensors are a 3-Wire PC BLDC Fan. Coolant temp sensor wiring diagram. With the sensor unplugged the PCM should show -40 or so and with the PCM signal wire jumpered to ground the PCM should show max temp, whatever that is in Celsius. O2 Sensor Wiring Diagram 4 Wire O2 Sensor Diagram 4 Wire. The two-wire crankshaft position sensor has a signal wire through which the crank sensor sends its voltage to the ECU.

5. Hyundai Elantra Wiring Diagram. The two Black wires are batt +/- wires and should be hooked up to ign. The reference voltage on pins 1 and 3 should be 5V. The second is the ground wire, which is necessary for the current to complete an electrical circuit. 2 wires will be ground, 1 signal to PCM, and 1 signal to gauge. So the whole wiring for the ambient temperature is gone. The Engine Coolant Sensor is used as the primary input to the Electronic Control System to enable adaptive cooling. There are wire extensions available if you finish up cutting them short, but the wiring will work better if it is intact. Any wiring enclosed by a shaded or dotted box is internal to a switch assembly and must be tested as described in sections 2-4(a) and 2-4(b). Ill add Ive had some difficulty in the past with coolant temp sensors, getting the version with the correct number of leads to match my Corollas corresponding connector. 0 cdti with the Renault engine in. with stainless steel tube 4-wire rugged. Ground signal wiring shield at the power supply end. Yellow Wire is the Data wire: we usually connect a resistor between the data wire and VCC wire, I will explain this in the circuit diagram. Wiring: Connect to one side of the thermistor device. green wire will not be long enough to reach the new three-wire WP sensor so you will need to solder an extension wire to it; 6 ft. should be plenty and leave you some extra.

The wire configuration will be suited to different aspects of the application at hand. Pin 1 = L.blue red to ECU Pin 26. 2 Wiring diagram for RTDs. Fig. 1999 Mitsubishi Eclipse GST. NOTE: The mass air flow (MAF) sensor wiring diagram and info in this page apply to specific Ford vehicles/model years. About Coolant Diagram Temperature Sensor Wiring Wire 4. The heated sensor uses an internal coil to heat the ceramic element to the desired 400 Celsius in 30 or 40 seconds. Red Red White White Red Red White. Likes: 530. 1: Index of Wiring Diagrams. Engine start circuit. Pin 4 = white to ECU Pin 6. 4 wire temp sensor Share on Facebook; Open Question. Out of shear blind luck, I decided to replace one sensor, the engine coolant temp sensor(it may be the engine temp sensor in the runner, may make a difference) If you have a single speed fan, just add the orange bits, but connect the fan via the 91deg part of the temp sensor Note: Whenever a wire is labeled with Access our free Wiring Diagrams Repair Guide for GM Full-Size Trucks 1988-1998 through AutoZone Rewards. The following tutorial will help you to test the crankshaft position (CKP) sensor: Crank Sensor Test (4.8L, 5.3L, 6.0L) No Spark No Start Tests (at: troubleshootmyvehicle.com).

Page 3/5. Posted by Anonymous on Oct 05, 2011. Likes: 530. RELATED CMP SENSOR TROUBLE CODES: P0341 -What Does It Mean? The output transistor of IC1 has its collector at pin 1 and its emitter at pin 2. Edraw 4 Wire Wiring Diagram Temp Sensor wiring diagram software is a particularly-designed application automating the creation of 4 Wire Wiring Diagram Temp Sensor wiring diagrams Temperature: -50 C - 250 C. Each side of the RTD has two wires attached. Take a look at the Applies To: box on the right column to check for specific application info.. 2 0-20 volt sensor input Any 0-20 volt sensor input Wiring: Connect to desired voltage input. Re: 4 Pin Water temp sensor + oil buzzer. Step 1: Wiring Diagram. Between 12004000. NOTE: The Audio Warning System is also connected into the ignition module circuit. 2003 bmw x5 e53 wiring diagram wiring diagram service download free 2003 bmw x5 e53 wiring diagram pdf this 2003 bmw x5 e53 wiring diagram covered e53 starter control start relay can interface characteristic map cooling coolant temperature electric fan engine Clicking this will make more experts see the question and we will remind you when it gets answered. OK. it is about 4 -5" to the rear of the engine from the intake air temperature sensor. Procedure 1. The Blue is signal + (the original o2 wire). 3 wire Pt100 RTD Sensor Wiring System. References for Honeywell Thermostat 4 Wire Wiring Diagram. Inductive Cylindrical 3-Wire and 4-Wire DC Inductive Proximity Sensors 3-Wire and 4-Wire DC 89 2-Meter Cable Models Dia. T Thermistor temperature input Most coolant and air temperature sensors are a 2 wire thermistor design. Conversely, if it senses an RPM drop, it will start to retard some of the spark timing. 2: Sample Diagram: How to Read and Interpret Wiring Diagrams. the single wire temperature sensor sends to the gauge and the double wire sensor kicks on to when the engine is warm, and controls the OD lockout. These diagrams include: Fig. Crank sensor wiring diagram (part 1) note: The crankshaft sensor is a critical component in your cars engine. The part you need is the Green You also may need the clip that holds the sensor in. CASService explains how to wire the temperature probes to an exhaust hood control package. Note that the external wiring diagram in this Sensors and Wiring section is entirely separate from, though similar to, the Relay Board. - with an automatic transmission; - with a mechanical gear box; 1 - the block of the relay and safety locks in a motor compartment; 2 - the ignition switch; 3 - fuse of the engine start circuit and ignition coils; 4 - rechargeable battery; 5 - see pos. Its always better to have too much wire than not enough. Hide thumbs .

The difference between the heated (3 or 4 wire) O2 sensor and a non-heated (one wire) sensor is the A/F ratio sensing of warm up and low load conditions. Minneapolis, Minnesota. Sep 17, 2015. The White is the signal neg. Pt100 Temperature Sensor Wiring Diagram. Match the colors up The CTS, the harness wiring, and the harness connector, are all prone to failure Some cars use separate engine coolant temperature sensors for the radiator fan and the engine control unit (hazardous areas) Controlled 71 Black Ground, A/C Selector Sw Controlled 71 Black Ground, A/C Selector Sw. Shares: 265. Connection diagrams for RTD temperature probes To ensure uniform wiring of all temperature probes, JUMO manufactures RTD temperature probes and thermocouples according to the JUMO House Standard. 150 degrees maybe, not sure Hey all, am after a wiring diagram for the fiat stilo 1.4 16v ( same as 1.2 16v) Absolute pressure/temp sensor thats in the manifold. According to elearn the 'integrated air temp sensor'. For the Power Transistor, I used one from a 1st gen Acura CL. Columbus, OH. The black wire is the Ground wire. Ground signal wiring shield at the power supply end. I guess you knew that. Search: 4 Wire Coolant Temperature Sensor Wiring Diagram. Temperature humidity transmitter, Transducer TRH-300, 301, 303. The addition of a third wire, connected to one side of the measuring element, helps to compensate for the lead resistance. Nov 1, 2013. 2. Three-inch guideline. Search: 4 Wire Coolant Temperature Sensor Wiring Diagram. #2. About Coolant Sensor Wire Temperature Diagram 4 Wiring . Ls1 3 wire coolant temperature temp sensor wiring connector 97 98 gm corvette. Inductive Cylindrical 3-Wire and 4-Wire DC Inductive Proximity Sensors 3-Wire and 4-Wire DC 89 2-Meter Cable Models Dia. Input Voltage: 12VDC 10%. by MK2 G60 Mon Apr 30, 2012 4:38 am. to deal. Coolant outlet from heat exchanger 6. Step 1: Wiring Diagram. Gary. The highest measurement accuracies are only achievable with a Pt100 in a 4-wire connection. Insulate or terminate the unused white lead in a manner that prevents shorting to the ground. It was published in 2009 and it is mainly for Ford Focus model year 1998-2005. Shares: 265. 5V (should be 5V) while the green wire from C18 Use a heat gun to warm up the sensor. Likes: 530. The 4-wire circuit is a true 4-wire bridge, which works by using wires 1 & 4 to power the circuit and wires 2 & 3 to read. Search: 4 Wire Coolant Temperature Sensor Wiring Diagram. Likes: 530. This can minimize the span of the temperature sensor range. When connected to the amplifier, the smart amp will measure the voltage across the RTD and also across the wire pairs. 3-wire 4-wire. As long as the junctions are near the RTD, as in a connection head, errors are negligible. It is very important that each of the three wires used in the measuring circuit are equal in terms of both conductor size and length. A four-wired oxygen sensor has four wires, two wires for the heater circuit and two wires are for the sensing element. Btw - 87 did not have 4 wire sensors, starting in 88 did Toyota use 4 wire sensors. 3. The FSM has ohm values for a good ambient temp sensor - the sensor itself is just behind the grill and will be above you when you raise your hood. It is in the place just in front of the passenger's side wheel well plastic cover (remove the passenger's side wheel well plastic cover and you will see the Secondary Air Pump in there). On 1st gen auto 12v's there is what you are referring to. to deal. How To Tell Which O2 Sensor Is Bad + 4 wire o2 sensor wiring diagram.

So is there 2 wires, both a yellow and black wire, in the wiring harness provided for the connector going to the sensor, like in the schematic @Nevada_545 posted above?. Jun 7, 2003. Temperature range is -50 to 302 F (adjustable 1 F to 20 F differential). Temperature range is -50 to 302 F (adjustable 1 F to 20 F differential). This sensor is the CK1-00-2H capacitive proximity sensor. 3 Wire Coolant Temperature Sensor Wiring Diagram. 4 Gauge Battery Cable Kit, Wiring Diagrams, 3 Pin and 4 Pin Plugs, Fuse Box and 12 & 16 Gauge Colored Wire. The difference between the heated (3 or 4 wire) O2 sensor and a non-heated (one wire) sensor is the A/F ratio sensing of warm up and low load conditions. This true bridge method will compensate for any differences in lead wire resistances. What is 4 Wire Coolant Temperature Sensor Wiring Diagram. on first gens it has 2 wires one white one blue. Since a rule of thumb, youll want to have wiring that is very long to extend 3 inches outside of the electrical box. Pt100 temperature probe XE-3601. Input Voltage: 12VDC 10%.

MAF Sensor Wiring Diagram. Temperature Sensing If necessary you can con-nect a 2-wire RTD to a 3-wire circuit or 4-wire cir-cuit, as shown. What is 4 Wire Coolant Temperature Sensor Wiring Diagram. Inductive Proximity Sensors 3-Wire and 4-Wire DC 88 Wiring Diagrams 3-Wire DC Cable Connection Blue NPN Normally open AMBIENT TEMPERATURE-13 F to +158 F (-25 C to +70 C) APPROVALS FM APPROVED. Toyota HILUX Electrical Wiring Diagram. 2-wire circuit Shown is a 2-wire RTD connected to a typical Eo Wheatstone bridge circuit. Carries the throttle angle voltage signal (that the TPS creates) to the PCM. 12 Volt Feed Positive Power; MAF Wire Ground; MAF Signal ground; MAF Signal; A 4-wire mass air flow sensor has a 12-volt positive power source, which is connected to the fuse boxs fuse and relay. 4 wire temp sensor wiring diagram for mercury 135 part no 13536a14. Search: 4 Wire Coolant Temperature Sensor Wiring Diagram. If using a 4 wire sensor with a 3 wire instrument you can simply ignore the 4 th wire and leave it unconnected. For the greatest accuracy, you should choose a four wire Pt100 RTD specification. This measuring system is the only way of fully compensating for all lead resistance in the measuring system, even if each wire has a different resistance. A 4 wire oxygen sensor wiring diagram is also called a universal O2 sensor wiring diagram. DIY: 1998 528i AMBIENT Temp Sensor Hiding Place: I wrote this DIY in 2006 including my trick to relocate the AMBIENT Temp sensor to a safer place. Choose from full wiring harnesses, separate system harnesses (like Halogen headlight. Fig. Assuming you have a 1g ECU the yellow/green goes to ECU pin 20 and the green/black goes to ECU pins 17 & 24 as well as a few of the other sensor's ground wire pins (Note: do not put it to chassis ground). Ground the blue wire labeled Coolant temp and the gauge should read HOT. Oct 9, 2019. 3-Wire PC BLDC Fan. It shows the components of the circuit as streamlined shapes, and also the power as well as signal connections in between the devices. (Note: A1B1, A2B2 and C1C2 RPM the ignition module can add approximately 1015 degrees of spark advance to the base spark timing curve.

When wiring with two wires, first jumper across A1 and B1and A2 and B2 respectively, then connect PT100 sensors and to the RTD module according to the following diagram on the left. The temperature is given by the formula. Note To configure a single element, 4-wire RTD as a 3-wire system, connect only one white lead.

Here's a brief description of the mass air flow (MAF) sensor circuits: LT BLU/RED wire: . 4. Pin 3 = grey to ECU Pin 7. The sensing element wires go to the PCM, in which one wire is signal ground and the second wire is signal voltage. Surface Mount RTD 4 Wire Temperature Sensor - Self Adhesive Patch with 80" of PFA Lead Wire $53.00. My coolant temp sensor is at the top of the water pump adjacent to the hose going to the heater core - single wire. There are 4 pins on the sensor. Example 4-20mA thermistor transmitter wiring diagram. 2 wire speed sensor wiring diagram for audi a4 quattro 3.0. So when the ROI-XMA Thermistor transmitter is used with the ROI-USB current measurement A-D, the PC can be used to measure a Thermistor with higher precision than a direct measurement system. The box in the diagram represents the load. That is why we always have to refer to the manufactures wiring diagram. The 4-20mA transmitter gain can be adjusted. About Diagram Wiring Sensor Temperature 4 Wire Coolant . The two main types of safety sensors : Current sensors monitor power consumed, and maintain the connection only while demand is within a predetermined range. Pt100, class B, 4 wire Sensor temperature range -50 to 250 deg C 1 metre PTFE insulated screened lead 7/0.1mm for 3mm sheath 1metre PFA insulated screened lead 7/0.2mm 1 2 Wiring diagram for RTDs. a heating element to make sure the O2 sensor begins working immediately instead of waiting to get heated via exhaust temperature. Emerald will supply an adaptor harness for their aftermarket ECUs to allow for a MEMS 3 wiring loom to be converted to the MEMS 1. The MAP Signal Wire goes to the car ECU. We will also be using the bcm2835 C library to assist in reading the digital outputs from the sensors. The MAF Signal Wire goes to the car ECU. Want Answer 0. Match the colors up. Input Voltage: 12VDC 10%. Thanks Diesel, The car has been in a front collision before I bought it. Pin 2 = grey red to ECU Pin 55. 4 Wire RTD Sensor, RTD, Resistance Temperature Detector (RTD) Mar 18, 2011. The engine cuts out and dies, and I believe it is a short in the engine wiring harness from the PCM. 3 wire Pt100 RTD Sensor Wiring System. Some sensors have PNP and NPN as well as NO and NC output contacts. The wire colours match the loom i have. The ground wire also goes to the car ECU. https://instrumentationtools.com/4-20-ma-transmitter-wiring If the rev counter is not working oil buzzer will sound.The cluster got rpm signal direct from ecu.That was also depending what dash and ecu with year model. Ground sensor wiring shield at the sensor, if possible. Conclusion. Note To configure a single element, 4-wire RTD as a 3-wire system, connect only one white lead. Once the wire is free, reinsert the knock sensor and starter solenoid wires back in the loom, tape it up, and lock it in the plastic clip.

The difference between the heated (3 or 4 wire) O2 sensor and a non-heated (one wire) sensor is the A/F ratio sensing of warm up and low load conditions. wire and would go to the E1 on the ECU as it is for engine ground. What probably happened is that when the sensor was "removed" the wires to the sensor were ripped out, too. Both wires are connected to the car computer (ECU). Match the colors up The CTS, the harness wiring, and the harness connector, are all prone to failure Some cars use separate engine coolant temperature sensors for the radiator fan and the engine control unit (hazardous areas) Controlled 71 Black Ground, A/C Selector Sw Controlled 71 Black Ground, A/C Selector Sw. switch. The heated sensor uses an internal coil to heat the ceramic element to the desired 400 Celsius in 30 or 40 seconds. 2003 bmw x5 e53 wiring diagram wiring diagram service download free 2003 bmw x5 e53 wiring diagram pdf this 2003 bmw x5 e53 wiring diagram covered e53 starter control start relay can interface characteristic map cooling coolant temperature electric fan engine The red wire is the VCC wire: the operating voltage is 3 to 5 volts. What is 4 Wire Coolant Temperature Sensor Wiring Diagram. This provides a means of providing adequate cooling in severe engine temperature conditions. A four-wire mass air flow sensor has four wires. Hey all, I have a 2008 F250 with the 6.4. Undo the wiring harness of the 96-hole plug. Pt100 Temperature Sensor Wiring Diagram. NOTE: The throttle position sensor (TPS) wiring diagram and info in this page apply to 1997-1999 Ford 4.6L, 5.4L vehicles/model years. The dk. The first thing you should do is test and see if you get 5V on those connector terminals. The exterior temp sensor sits forward of the tire but behind the bumper. Figure 2-1: RTD Lead Wire Configuration per IEC 60751 - Single Element. When I move the harness at the PCM that goes to the engine cylinders start to cut out, it runs rough then dies. WOLF 2 Pair Car Door Speaker Wire Adapter Connector Harness Replacement for Select 2000-2019 Toyota and Scion, Camry 4Runner, Subaru 2012-2019 Vehicles 4.5 out of 5 stars 182 $12.99 $ 12 . The heated sensor uses an internal coil to heat the ceramic element to the desired 400 Celsius in 30 or 40 seconds. The two wires, a 5-volt reference, and a ground wire go to the ECU, and the third wire Earth Signal Wire for Temperature Gauge goes to the cluster-mounted temperature gauge by providing an earth signal to the temperature gauge. I bought the sensor hoping to just attached it to the cable but there was no cable/wire. A 4-wire transmitter has 2 wires connected to a power supply, and 2 signal wires connected to the PLC. Intake Air Temperature (IAT) Sensor Signal Wire; A 4 wire manifold absolute pressure sensor has a 5-volt reference voltage, which is connected to the car computer (ECU). What is 4 Wire Coolant Temperature Sensor Wiring Diagram. What is 4 Wire Coolant Temperature Sensor Wiring Diagram. 4 Wire Pt100 RTD Probe 3 Inches Long x 1/8" Diameter Stainless Steel Sheath with 40 Inches of PFA Lead Wire $55.00. Collection of 2 wire proximity sensor wiring diagram. Search: 4 Wire Coolant Temperature Sensor Wiring Diagram 2) B-13 is supposed to be an ac relay yet a water coolant temp sensor is connected while the other wire leads to A-16. As with thermocouples, RTD outputs measuring temperature change are small - we are looking at less than 0.5 ohms per C for an IEC standard device. Owner's manual - 540 2 extra temperature sensors. Single Wire Coolant Temperature Sensor Wiring Diagram A single wire coolant temperature sensor has only one wire, which goes to the radiator fan relay. A. Sensor wire B. Transmitter C. Shield ground point. Compact RTD Probe M12 Connector - G1/8"Fitting - 1/2" Long 3 mm Diameter - 4 Wire Class A Accuracy $45.00.

Inductive Proximity Sensors 3-Wire and 4-Wire DC 88 Wiring Diagrams 3-Wire DC Cable Connection Blue NPN Normally open AMBIENT TEMPERATURE-13 F to +158 F (-25 C to +70 C) APPROVALS FM APPROVED. Es is the supply voltage; Outputs the MAF The DS18B20 Waterproof Temperature Sensor has three wires. Engine Coolant Temperature Sensor. 1/4 B A THERMOSTAT WIRES THERMOSTAT TERMINAL BLOCK Figure 3. Application Methods and Equipment - RTDs. So, I wouldn't be surprised that the fog light harness is common with the sensor harness.

Jan 24, 2017. 3: Wiring Diagram Symbols. What is 4 Wire Coolant Temperature Sensor Wiring Diagram. Any wiring enclosed by a shaded or dotted box is internal to a switch assembly and must be tested as described in sections 2-4 (a) and 2-4 (b). 27 Engine Coolant Temperature Sensor Circuit Diagram - Wiring Diagram List. Each wire is maybe 1 of resistance. This is listed for 03. Engine Coolant Temperature Sensor (ECT) - With Manual Transmission Only. Also See for HILUX . The coolant temperature sensor uses a mushroom shaped key way where it inserts into the sensors while the open element intake air temperature sensor uses a rectangular connector key way. Red Red White White Red Red White. A Pt1000 measuring element in class A also offers good measurement accuracies in a 2-wire connection and represents an economical alternative to 3- or 4-wire connections for machine building. Figure 2-1: RTD Lead Wire Configuration per IEC 60751 - Single Element. RAVE to me says that the engine coolant temp sensor is Grey/Blue and Brown/Green aswell. 2003. RELATED WIRING DIAGRAMS: Ignition Coil Circuit Wiring Diagram (1999-2002 V8 Chevrolet Silverado, GMC Sierra). temperature sensor experiment. Ensure the sensor wiring and signal wiring shields are electrically isolated from the transmitter housing and other grounded fixtures. The temperature sensor being used is a DHT11/ DHT22 /AM2302. RTDs are a type of temperature sensor; a Resistance Temperature Detector. Look at the FSM - in my mind something about a steady -40*F means bad sensor, but I'm not sure. Manual. These GM wiring diagrams provide schematics for vehicle model years 1988 through 1998.

T = (f 10000) / 38. where T is the temperature in C and f the frequency in Hz. Insulate or terminate the unused white lead in a manner that prevents shorting to the ground. A 2-wire transmitter has only 2 wires and is connected in series with the power supply and the PLC. Pins 1 and 3 are + and 2 and 4 and -. Shares: 265. 3-Wire PC BLDC Fan. About Wire Sensor Wiring Temperature Diagram Coolant 4 F/C Water Temperature Gauge, Use with VDO Sender, 12V," Spade Connection Learn More ViewLine Ivory F/C Water Temperature Gauge 12/24V &. Additional wires are for the heater and its ground (3 wire sensor), and possibly an additional wire to ground the sensor itself (4 wire). The sensor needs to be quite hot to operate. The heater keeps the sensor at operating temperature under more conditions.