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QB93Z · 10-05-2017

I may be incorrect about the TDS and start enable. The service manual is not clear on whether a TDS unauthorized entry signal to the CCM causes the CCM to block start enable. Also I couldn't find any circuitry that disables the Ignition System in the 1990 FSM.

So, the next recommendation I have is to check if the fuel pumps run when the ignition key is turned to ON. They should be running. You can check for fuel pressure by connecting a gauge to the fuel test connection on the front end of the right side fuel rail. The connection is facing the back of the alternator. With Key ON and Engine OFF, the fuel pressure should be ~50 psi. Note the 1990 Service Manual does not show this circuitry (that I could find).

Jim

10-05-2017	#9
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: Buzzing noises from glove box I may be incorrect about the TDS and start enable. The service manual is not clear on whether a TDS unauthorized entry signal to the CCM causes the CCM to block start enable. Also I couldn't find any circuitry that disables the Ignition System in the 1990 FSM. So, the next recommendation I have is to check if the fuel pumps run when the ignition key is turned to ON. They should be running. You can check for fuel pressure by connecting a gauge to the fuel test connection on the front end of the right side fuel rail. The connection is facing the back of the alternator. With Key ON and Engine OFF, the fuel pressure should be ~50 psi. Note the 1990 Service Manual does not show this circuitry (that I could find). Jim