88 ranger
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Joined: Dec 2007
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88 ranger
I have and 88 Ford Ranger that wasn''t running when I bought it. The problem is that the fuel pump won''t come on. The signal that turns the relay on is not going low when I turn on the ignition switch. I can force it low with by grounding it and the truck will start and run. Is there a sensor that interlocks the fuel pump circuit? The EEC relay (whatever that is) is the same relay as the fuel pump and it''s not turning on either. What am I missing?
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
Well heres how it's supposed to work.
Voltage from the ignition switch on red/light green closes the EEC relay.
The EEC relay sends voltage to the coil side of the pump relay on solid red & the ECM (computer) grounds this voltage on tan/light green which closes the relay & turns the pump on.
One possibility is a bad ignition switch not sending voltage to the EEC relay.
FYI the EEC relay also powers the injectors
TPS ECM EGR solenoid ETC ETC, thru a splice.
Voltage from the ignition switch on red/light green closes the EEC relay.
The EEC relay sends voltage to the coil side of the pump relay on solid red & the ECM (computer) grounds this voltage on tan/light green which closes the relay & turns the pump on.
One possibility is a bad ignition switch not sending voltage to the EEC relay.
FYI the EEC relay also powers the injectors
TPS ECM EGR solenoid ETC ETC, thru a splice.
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