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Questions and Answers

Voyager Fuel Pump Power

Q. Aloha, My name is Frank and I have a question about my 1988 Plymouth Voyager van. It has about 70,000 miles and right now it does not run. It has a 3.0 liter V-6 engine equipped with fuel injection. I have already tested the wiring to the fuel pump in the gas tank and I do not have any power to all the wiring going to the fuel pump and fuel tank.

I have gone through the Haynes manual for this type of vehicle but it does not cover the wiring diagrams for the fuel electrical system. I would appreciate your advice on what to do next? In the meantime I have been checking all of the fuseable links and so far I have not located an open circuit. Please advise!


A. I would look at the Auto Shut Down (ASD) Relay as the cause of the problem. The Auto Shut Down (ASD) Relay controls power to the ignition coil, fuel injectors, and electric fuel pump. Controlled by the Single Module Engine Controller (SMEC) the ASD supplies power to the ignition coil, fuel injectors, and electric fuel pump at all times when the ignition switch is in the START position. When the ignition switch is in the RUN position and the SMEC is receiving reference signals from the distributor, power will also be supplied.

But if there is no reference signal after two seconds the SMEC will de-energize the ASD Relay and no power will be supplied to the ignition coil, fuel injectors, or electric fuel pump.

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