Question about Chevrolet Cars & Trucks
Hope this helps. Should be on front side of engine, low, two wire connector, wire colors tan and yellow. Take wiring connector loose, use proper size socket or wrench to remove.
Posted on May 19, 2017
Testimonial: "Now that I have lived this pain in the rear, let me expand on Jack's answer. Anyone else attempting this should look at the front of the engine, above the exhaust manifold and to the left of the oil dipstick to find the silver cylindrical heat shield that protects the sensor and connector. Slide the heat shield up the wires to gain access to the connector and sensor. The connector has a red lock tab that must be pulled up in order to be able to depress the black lock tab on the connector to remove it from the sensor. I found that a deep 20 mm half inch drive socket was the only socket with enough clearance inside of it to accommodate the plastic that the connector attaches to. R&R the sensor without draining the coolant. It is unnecessary to drain as only a few ounces are lost even if you are moving slowly. I torqued the sensor to 18 ft. lbs. but I may have stolen that value from the timing chain cover bolts. Check for the correct value before accepting that as fact. Either way it should be a sufficient torque value for a water sensor. Top off coolant if necessary, check to see if your CEL is still on or not. Even if it isn't on anymore, go to your nearest auto parts store and ask them to check to see if the code is still in memory, if it is, ask them to clear it for you. YMMV! Good luck!"
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Posted on Jan 02, 2017
Tips for a great answer:
Engine control module (ECM) replacement
Crankshaft damper replacement
CKP sensor replacement
Any engine repairs which disturb the crankshaft to CKP sensor relationship
Important: The scan tool monitors certain component signals to determine if all the conditions are met to continue with the CKP system variation learn procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
CKP sensor activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC that set.
Engine coolant temperature (ECT)--If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
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Cooling Fan Switch
Engine Temperature Sensor
Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
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.
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.
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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