Can a PCM operate without a good ground?
Can a PCM operate without a good ground?
The PCM can’t operate properly if it does not have a good source of power and a good ground. This video shows how to test both. PCM power and ground testing. The PCM can’t operate properly if it does not have a good source of power and a good ground. This video shows how to test both. Skip navigation Sign in Search Loading… Close
What should be the ground resistance of a circuit?
Zero Ohms… Not Really! Unfortunately, there is not one standard ground resistance threshold recognized by all certifying agencies. The NFPA and IEEE recommend a ground resistance value of 5 ohms or less while the NEC has stated to “ Make sure that system impedance to ground is less than 5 ohms specified in NEC 50.56.
What should the voltage be on my ECM PCM sensor?
If the meter reads 5.0 volts, the electrical circuit is good. If the meter reads other than 5 volts, ground one meter lead and test the 5 volt reference wire. It should read 5 volts. If it doesn’t you have a wiring or computer problem. Using the wiring diagram check the pin at the computer that supplies the 5 volts.
Is the goal of ground resistance zero ohms?
Zero Ohms… Not Really! The goal in ground resistance is to achieve the lowest ground resistance value possible, that makes sense economically and physically, when contacting the earth, also known as the soil/ground rod interface. What Is a Good Ground Resistance Value? Ideally, a ground should be zero ohms of resistance, but…
If the meter reads 5.0 volts, the electrical circuit is good. If the meter reads other than 5 volts, ground one meter lead and test the 5 volt reference wire. It should read 5 volts. If it doesn’t you have a wiring or computer problem. Using the wiring diagram check the pin at the computer that supplies the 5 volts.
How is ground circuit resistance measured in ohms?
One common method of ground bond testing, shown in Figure 14, applies a 25A source between the protective grounding terminal of the device and all conductive parts that are accessible to the user. The tester used for this purpose supplies the required current and displays the ground circuit resistance in ohms or milliohms.
What are the two main problems with grounding?
First of all I’m going to discuss the separate problems we’re trying to avoid, and then how to analyze them and optimize the ground layout for each of the problems. The two main problems are ground offsets due to common impedance paths and magnetic field noise.
Why do ECUs have dedicated sensor ground wires?
This is why ECUs have dedicated sensor ground wires. If the sensor’s ground is not isolated from the body of the sensor and it has to screw onto the engine, for example many Nissan cam angle sensors, narrowband oxygen sensors and many knock sensors, then you don’t have a choice; you have to choose the star point ground at the engine.
