How does the EEC power relay work in a car?
The EEC Power Relay not only supplies battery voltage to the fuel injection computer (also known as the E.E.C. Electronic Control Assembly), but also supplies power to the fuel injectors, the fuel pump relay, and a few other emissions related solenoids. The EEC Power Relay is easy to recognize…
How can I tell if my EEC relay is faulty?
Oddly, though, when it would finally die and not idle anymore, the fuel pump was still running as I could hear it (Walbro 255, very audible when car is off), and the A/C WOT Relay would intermittently click every couple seconds, along with the fuel pump relay (and when this clicked, I could hear fuel pump momentarily shut off for the click).
Can a faulty EEC relay run a fuel pump?
PIP sensor would not cause the EEC relay to cycle, but it would cause the fuel pump relay to cycle. After the initial prime, the ECU only runs the fuel pump when it sees pulses from PIP. Dunno if that’s also true for the compressor clutch relay.
When is an EEC IV engine running too lean?
If the output of the O2 (HEGO) sensors stay either below .33 volts or above .8 volts, then the engine is running too lean or too rich.
How to retrieve trouble codes on your EEC-IV system?
Start the truck and let it run at 2000 RPM for 2 minutes to warm the sensors. Turn off the engine and reconnect the jumper between the STI and DLC Connectors. Wait 10 seconds between the time you shut the truck off until you start it again. Start the truck.
What is the low current circuit on a Ford EEC?
Every Ford EEC Power Relay has two basic circuits and for the purpose of our discussion, we’ll call them: A low current circuit. This circuit can be identified by the wires labeled with the numbers 1 and 2. The low current circuit is the control circuit that ‘closes’ or ‘opens’ the high current circuit.
Is there a hill descent control fault or service advance track?
Anyways I was driving and started seeing the same warnings. Hill decent control fault, service advance track, etc and while driving in the city (Boston) thankfully not on the highway, the warnings came back on except this time with the Power Steering Assist failure and I lost control of steering.