Where is the temperature sending unit located on a 2000 chevy s10 2.2 four cylinder engine

It is located on the drivers side of the engine. On the block ,below the front cylinder head. Theres probably an air/intake hose covering it from the air filter box. Follow the radiator hose on that side to the engine. Itll be to the left of the thermostat housing.

There are two. One is the sending unit for the temperature gauge. It is located in the intake manifold runner just to the left of the alternator. (Left, meaning your left as you are facing the front of the engine -Passenger side of the engine)
The other is the sending unit for the computer which is located in the left cylinder head under the intake manifold. (In this case, Left means the engine left bank or driver's side of the engine.) The intake manifold must be removed to get to it.

For 1997 Pontiac Sunfire 2.2L SFI OHV 4cyl the Coolant Temperature Sensor is located under hood, driver side, upper engine area, below valve cover, mounted in cylinder head.



Fig. 1: The ECT is also the temperature sending unit for the gauge on the instrument cluster

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The temperature sending unit should be located on the drivers side cylinder head between the number one and the number three spark plugs, that is if it is the original engine.

Temperature sending unit is bad.Located on engine cylinder head

VW Passat & Audi A4 1990-2000

Motronic System
The Engine Coolant Temperature (ECT) sensor is mounted in the water outlet on the back side of the head. If you vehicle still has a original VW part it will be black in color with a four terminal connector. This device signals the engine management system with the current coolant temperature, the ECU takes this information and uses it to control other such circuits as the idle speed, knock control system, oxygen sensor circuit, exhaust gas recalculation, and fuel tank venting. It is also important to note that if at any time ECU does not receive a signal from the ECT it will substitute a value of 176°F (80°C).

VR6
The Engine Coolant Temperature sensor is mounted in the thermostat housing. The body of the sensor will be blue and the sensor will be blue and have two terminals if it is an original factory VW part.

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.On models produced prior to 1994, the engine coolant gauge temperature sensor is a single wire terminal sensor.

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.

WARNING When trouble shooting electrical components, always consult a wiring diagram for the particular year, make and model to ensure proper test equipment connection and diagnosis. Failure to use suitable test equipment and testing methods could permanently damage the electrical component(s).



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




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

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Ok, you have three sensors on this engine that work together to manage the temperature reading that are sent to the gauge. i recommend checking all three to be safe. i will list the sensors and, locations below.

1. Coolant temperature sensor- Under hood, driver side, upper engine area, above transmission bell housing, mounted in driver side end of intake manifold.

2. Engine Temperature sensor- Under hood, driver side, upper engine area, mounted on rear cylinder head

3. Temperature switch.- Under hood, center, lower engine area, above oil filter, rear of coolant temperature sensor, mounted in engine block

SECTION 303-14: Electronic Engine Controls 2000 Expedition/Navigator Workshop Manual DESCRIPTION AND OPERATION Electronic Engine Controls The electronic engine controls consist of the:

• powertrain control module (PCM)

• throttle position (TP) sensor

• idle air control (IAC) valve

• engine coolant temperature (ECT) sensor

• camshaft position (CMP) sensor

• crankshaft position (CKP) sensor

• mass air flow (MAF) sensor

• intake air temperature (IAT) sensor

• heated oxygen sensor (HO2S)

• knock sensor (KS)

• vehicle speed sensor (VSS)

• cylinder head temperature (CHT) sensor

The PCM needs the following inputs to calibrate the engine correctly:

• engine rpm

• engine coolant temperature

• amount of engine detonation

• crankshaft position

• air temperature

• throttle position

• cylinder head temperature

• mass air flow

The TP sensor:

• sends the PCM a signal indicating the throttle plate angle.

• is the main input to the PCM from the driver.

The IAC valve:

• controls bypass air around the throttle plate at low speeds.

• is controlled by the PCM.

The ECT sensor:

• sends the PCM a signal indicating engine temperature.

• resistance decreases as coolant temperature increases.

The CMP sensor:

• sends the PCM a signal indicating camshaft position used for fuel synchronization.

The CKP sensor:

• sends the PCM a signal indicating crankshaft position.

• is essential for calculating spark timing

The MAF sensor:

• sends the PCM a signal indicating mass airflow rate of air entering the engine.

The IAT sensor:

• sends the PCM a signal indicating the temperature of the air entering the engine.

• resistance decreases as temperature increases.

The HO2S:

• has the ability to create a voltage signal dependent on exhaust oxygen content.

• provides feedback information to the PCM used to calculate fuel delivery.

The 4.6L KS is located in the lifter valley. The 5.4L has a unique linear KS located in the lifter valley.

• The KS sends a signal to the PCM indicating engine detonation.

The CHT sensor:

• is mounted into the wall of the cylinder head and is not connected to any coolant passages.

• sends a signal to the PCM indicating cylinder head temperature.
  • If the temperature exceeds 126°C (258°F) 5.4L, 130°C (265°F) 4.6L, the PCM disables four fuel injectors at a time. The PCM will alternate which four fuel injectors are disabled every 32 engine cycles. The four cylinders the are not being fuel injected act as air pumps to aid in cooling the engine.
  • If the temperature exceeds 154°C (310°F) 5.4L, 166°C (330°F) 4.6L, the PCM disables all of the fuel injectors until the engine temperature drops below , 154°C (310°F) 5.4L, 153°C (308°F) 4.6L.

The VSS:

• is gear driven by the transmission.

• sends a signal to the PCM indicating vehicle speed. For additional information, refer to Section 307-01A R4100 and/or Section 307-01B 4R70W

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P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when fuel control system no longer detects switching for a calibrated amount of time. See Possible Causes for DTC P1130

P1130 - Lack of HO2S-11 Switch, Fuel Trim at Limit The HEGO Sensor is monitored for switching. The test fails when the HO2S fails to switch due to circuit or fuel at or exceeding a calibrated limit.

• Electrical:
  • Short to VPWR in harness or HO2S
  • Water in harness connector
  • Open/Shorted HO2S circuit
  • Corrosion or poor mating terminals and wiring
  • Damaged HO2S
  • Damaged PCM
• Fuel System:
  • Excessive fuel pressure
  • Leaking/contaminated fuel injectors
  • Leaking fuel pressure regulator
  • Low fuel pressure or running out of fuel
  • Vapor recovery system
• Induction System:
  • Air leaks after the MAF
  • Vacuum Leaks
  • PCV system
  • Improperly seated engine oil dipstick
• EGR System:
  • Leaking gasket
  • Stuck EGR valve
  • Leaking diaphragm or EVR
• Base Engine:
  • Oil overfill
  • Cam timing
  • Cylinder compression
  • Exhaust leaks before or near the HO2S(s)

A fuel control HO2S PID switching across 0.45 volt from 0.2 to 0.9 volt indicates a normal switching HO2S.

P0153 - HO2S Sensor Circuit Slow Response (HO2S-21) See DTC P0133

P0133 - HO2S Sensor Circuit Slow Response (HO2S-11) The HEGO Monitor checks the HO2S Sensor frequency and amplitude. If during testing the frequency and amplitude were to fall below a calibrated limit, the test will fail.

• Contaminated HO2S sensor.
• Exhaust leaks.
• Shorted /open wiring.
• Improper fueling.
• MAF sensor.
• Deteriorating HO2S sensor.
• Inlet air leaks.

Access HO2S test results from the Generic OBD-II menu to verify DTC.

if its a four cylinder engine check your coolant temperature sensor. not the sending unit. cause that operates your temperature gauge.