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I need to know the wiring color codes for a 1993 GMC sierra 5.7 litter 350, so I can locate the o2 sensor wire in the harness. PLEASE HELP me if you can THANKS.
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Code 53 is for a problem with the heater in the O2 sensor for bank one sensor one. It could be something in the wiring or you could have a defective sensor.
Locate the wires running off
from the O2 sensor. There should be two. The black wire is the ground
wire. The other wire, which may vary in color, supplies power to the
sensor.
2
Connect the power lead to the corresponding connector on the chassis's wiring harness.
3
Connect the black, or ground, lead to the corresponding connector on the factory wiring harness.
3
wires, "how do i wire it" are simply explained. all universal 3 wire o2
sensors will have 2 wires one color, the other wire a different color.
the 2 that are the same color are ground and power for the heater and it
doens't matter which one is which. so ground to the motor, power from
the gray wire on the fuel pump, or anywhere you want to pull 12 volts
while the car is running. i have a dedicated fan relay that doesn't use
the ecm and runs off the key, so thats where i went. the different color
wire goes to the stock sensor wire, it's the signal.
There should be 2 ways of doing this. Get a portion of the wiring harness off a wreck or see if Ford can get you a new wire. Someone else may know more about this but some wires have heating elements in them and some may have resistance in the wiring. A plain wire would not be the same.
The O2 sensor after the Catalytic converter has gone bad or the converter it self. Lets start with the simple and replace the cheaper of the two but before you do that, check the wire harness where the O2 sensor clips on to the wire harness at the frame. Look for any damage to the clip such as corrosion or broken wire. Good luck and hope this helps.
Well, the IAT (Intake Air Temperature) sensor is located on the air intake duct between the filter and the throttle body (Assuming you have the 6L motor). The wires are easily visible at the plug that connects the sensor to the wiring harness. That's the easiest place to access them.
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