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This ground wire is to connect from one of the thermostat bolts to the body, If you cant see it then more then likely it had been not reinstalled at a time in the past when someone has replaced the themostat, you can install a new ground wire from thermostat housing to the body, It mounts from the top of the aluminun housing towards the rear of the engine, and then connects to the body,What is the issue you are having,with vehicle?
Then what is happening is the scanner is completing the communications link to the computer, First make sure all fuses are good, If all good, then take a look at the main relay and ground terminal to the main relay, (if relay does not engage, it will not start, some scanners can feedback thru system completing ground for relay.Thanks
If you require more assistance with this Please let me know, Thanking you in advance!
Sorry to hear that, I was trying to find out about ground signal to main relay, I will send request to supervisors, Thank-you