Posted by Tim GA on January 15, 2015 at 08:55:04 from (205.144.219.180):
In Reply to: Re: Gmc 7000 update posted by Zach Scherf on January 15, 2015 at 08:42:18:
The data plug should be under the dash near the steering column. you need a good scan tool to read the computer data to see what is not normal. unplugging to o2 sensor will only keep the computer in open loop. For the computer to store a code the sensor must be at the extreme voltage of more than 4.5 volts or lees than 0.5 volts for 2 or 3 seconds. The coolant sensor with ignition key in the run position and not ran for a long time should indicate close to air temp. The map sensor should be close to 1.6 volts with engine running. The map sensor is load sensor for the computer. the map sensor is like a vac gage. you need the data and code to see what is out of range of normal. To check for codes jumper terminals A to B and check the check engine light flash with key on engine off.
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