98 Ford Ranger
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98 Ford Ranger
I have a 98 Ford Ranger that won't start. It has a new fuel pump. The relay is not energizing the fuel pump at all. It seems to be getting power to the relay but not reaching the pump circuit. I have checked the inertia switch and it seems to be okay. I have switched relays around of the same value to no avail. Also have check a number of things but can't seem to get an indication of where the problem is. The scanner I have won't communicate with the computer in Generic mode for some reason. It is programmed up to 97 models but has the generic OBD II feature. Thanks for any help or suggestions. e-mail address is portcroz@msn.com
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check pcm power relay, the fuel pump won't run without it, it can also keep the pcm from talking to your scanner.
check f9 on the fuse panel under the hood the 20 amp mini fuel system fuse.
Pull the connector off of the fuel cutoff switch. With key in on position, look for 12v on the dark green/yellow wire. If it is there, the relay and wiring is ok, it goes to the pink/black to the fuel pump.
If Not, pull the relay and look for 12v on the Light blue/orange pin 1. that comes from the fuse.
look for 12v on pin 2 of the relay, it should be ok from the buss. look for a ground on the light blue/orange wire. that comes from pin 80 on the PCM.
also look on dark green/yellow pin 5 of the relay 12v, that comes from the pcm for inital start then opens when fuel pressure is up.
check f9 on the fuse panel under the hood the 20 amp mini fuel system fuse.
Pull the connector off of the fuel cutoff switch. With key in on position, look for 12v on the dark green/yellow wire. If it is there, the relay and wiring is ok, it goes to the pink/black to the fuel pump.
If Not, pull the relay and look for 12v on the Light blue/orange pin 1. that comes from the fuse.
look for 12v on pin 2 of the relay, it should be ok from the buss. look for a ground on the light blue/orange wire. that comes from pin 80 on the PCM.
also look on dark green/yellow pin 5 of the relay 12v, that comes from the pcm for inital start then opens when fuel pressure is up.
Last edited by Dave257; May 18, 2004 at 11:20 AM.
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Thanks Dave257 for your help on the fuel pump problem. I still haven't found the problem. I have checked all you said to check. The inertia switch has the 12 volt plus going in on a gray with stripe color wire, but nothing is coming out of the dark green yellow stripe or the pink with black stripe wire. Any other suggestions. Thanks again. I have went as far as I can go in knowing what to check.
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The gray wire goes to the dash, don't worry about it for now. The pink/black wire goes to the fuel pump after it comes through the inertia cutoff switch. The green/yellow wire is the problem.
You need to pull The fuel pump relay and check for 12 volts on pin 3 of the socket. the light blue/orange wire. (with key on)
The relay should have the pin numbers on it somewhere.
Dave
ps; Did you check the fuse's and check to see if you have 12 on the fuse, with key on.
You need to pull The fuel pump relay and check for 12 volts on pin 3 of the socket. the light blue/orange wire. (with key on)
The relay should have the pin numbers on it somewhere.
Dave
ps; Did you check the fuse's and check to see if you have 12 on the fuse, with key on.
Last edited by Dave257; May 19, 2004 at 07:56 AM.
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Well the lightblue/orange wire is feed 12v from the 20 amp fuse. pull the fuse and check on both sides with you light/meter. One side should have 12 volts and the other will not have anything. IF there is no voltage at that fuse, alot of things would not be working.
Dave
Dave
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The fuse checks out right on spec like you said. This thing is getting real interesting.
I used a multimeter so I know the voltage is there.
I used a multimeter so I know the voltage is there.
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OK, the wire runs from there to the pin 3 on the relay. If 12 isn't on the relay the wire may be open.
Measure the resistance between the fuse side with no voltage on it and pin 3 on the relay. if it measures 0 then the wire is ok, if it measures high or open the wire is bad between the fuse and the relay.
Dave
Measure the resistance between the fuse side with no voltage on it and pin 3 on the relay. if it measures 0 then the wire is ok, if it measures high or open the wire is bad between the fuse and the relay.
Dave
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Okay, I am getting a reading of 1880 ohms, and I suppose it should be infinity.
I checked the wire from the fuse no voltage and the relay wire light blue with stripe.
Again, I have to say in this instance I don't what the next step unless the wire is bad or shorted.
I checked the wire from the fuse no voltage and the relay wire light blue with stripe.
Again, I have to say in this instance I don't what the next step unless the wire is bad or shorted.
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Dave257, I don't have a copy of the wiring diagram on anything related to that. I have a Haynes Manual, but the diagram shows a 94 Ford Ranger which is different. The inertia in their diagram shows 2 wires, this vehicle has 3 wires going to that switch. Those manuals are not for professional and serious tech work, my opinion. Only one wire is hot with the switch on at the inertia switch and that is the light blue with stripe. The green wire coming off the relay is not hot with the switch on. Thanks.