I have a code that has been going off, here and there...mostly under the ole' lead foot, and sometimes not...like while cruiseing...It was "Coolant Temperature Sensor: Low Voltage" What does it mean? What causes it? What effects does it have on the engine? Where would it be located?

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Problems every other day with the car (probably not a mod, but to me it sure makes a difference)

 

Not sure on your particular problem but the way a computer and sensor will usually work is, the computer sends voltage to a sensor. The sensor usually changes resistance to temperature or pressure depending on the type of sensor, then passes the supplied voltage through the resistor back to the computer. If the output voltage is too low then you're getting a fault code.

It can be something simple as a plug disconnected or loose from the sensor or maybe a broken wire. It's also possible that the sensor is defective.

The computer needs to know the engine temperature. Without it, the computer will always think the engine is cold and probably get poor gas milage since the engine will be running rich.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley