What does fuel pump secondary circuit fault mean? And how do I fix it
94 ford ranger xlt 2.3l

 

You start by giving us the correct code#

Seeing that you don't have a diesel, we know that P0542 isn't correct

 

Welcome to the forum

1994 has 3 digit codes
so 542, he shouldn't have added the P0 to the front

I assume a "no start" is what is happening

But the secondary fuel pump circuit is the 12volts going to the fuel pump in the tank, it means there is no 12volts
In the passenger side of cab, up behind the glove box mounted on the firewall is the Inertia switch, looks like this: https://qph.cf2.quoracdn.net/main-qi...b1589f8c750-lq

See if the RED button on the top has popped up, if so press it back down(replace inertia switch if its popped up, as IT WILL pop again

If button is OK then check fuel pump fuse and may be replace Fuel Pump relay, or test it, both are in the engine fuse box

If any of this doesn't work then fuel pump in the gas tank is broken

 

Thank y’all do y’all know what the code 118 means and what I can do to fix it

 

Ford 3-digit code list(1993/94) seen here: https://www.therangerstation.com/tec...3-digit-codes/

118 (O,M) ECT sensor is/was high or open – ECT

ECT sensor is a 2 wire 5volt sensor only used by the computer, it tells the computer the Coolant Temp so computer knows when to "choke" the engine when its cold and when to not "choke" the engine when its warmed up
On a 1994 2.3l it's probably located on a heater hose by front of the engine, or next to the thermostat housing
Code means ECT is unplugged or has failed

Just FYI
ECT sensor has no connection to dash board Temp Gauge, that gauge uses a 12volt temp sender, the kind that has been used since vehicles had temp gauges, lol, 1930's or so

 

I’m looking at the fuel pump, fuse and relay. The fuse tester I have says the fuel pump fuse is still good and how would I test the fuel pump relay?

 

Have someone turn the key on while you have your finger on the relay you should feel it click on and then 2 seconds later click off