what does the injector circuit consist of?
May 28, 2006 at 5:37 AM
1999 Pontiac Grand Prix Injector Circuit
SUPERMAN
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Sorry for the late reply.
You have the fuel injector. Voltage and ground for injector. Voltage for the injector usually goes hot with the key. The ground for injector is controlled by the computer, ground pulse. You can get a noid lite from auto store to check for injector pulse. The computer won't ground the injector if it doesn't see an rpm signal, also, your security system, where applicable, could cause an issue.
The injector itself could have a problem? The computer might have a problem? The injector wiring circuits could be open or shorted?
I realize this is an old post. You probably no longer own this vehicle. In the future hope you don't have any vehicle issues, but, if you do, keep the site in mind. They are always working to improve the site and it's free.
Have a good day.
You have the fuel injector. Voltage and ground for injector. Voltage for the injector usually goes hot with the key. The ground for injector is controlled by the computer, ground pulse. You can get a noid lite from auto store to check for injector pulse. The computer won't ground the injector if it doesn't see an rpm signal, also, your security system, where applicable, could cause an issue.
The injector itself could have a problem? The computer might have a problem? The injector wiring circuits could be open or shorted?
I realize this is an old post. You probably no longer own this vehicle. In the future hope you don't have any vehicle issues, but, if you do, keep the site in mind. They are always working to improve the site and it's free.
Have a good day.
Mar 22, 2015 at 6:47 AM
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Suggested Repair
Check injector power, computer-controlled ground pulse with a noid light, RPM signal, security system, injector condition, and wiring for opens or shorts.
Conversation Summary
The owner asked what the fuel injector circuit consists of on a 1999 Pontiac Grand Prix GT. The expert explained that each injector has key-on voltage and a computer-controlled ground pulse, which requires an RPM signal and can also be affected by the security system. Possible problems include the injector, computer, or open or shorted wiring.