maskmarkman
Active LVC Member
Thanks all for your input: :yourock:
My 97 LSC died while driving at speed down the hwy.
It was short that came from the two wires that is connected to the crankshaft sensor. This short did blow the #11 fuse within the interior side panel fuse box only after I first check the fuse and was installing a new crank sensor. Its only a small 10 amp fuse but it provides the power to the PCM relay which without that we have no PCM or brains...LOL. Without any power to the PCM you won't have anything at all. It would crank but wouldn't fire. I had no fuel pressure or and the fuel pump wasn't pumping. I also didn't have fire at the plugs or coil which is also controlled though the PCM.
Within the gen 2 Marks the PCM relay is located within the fuse box under the hood and is the front relay (to the front of the car) or the first one of three black relays that are all alike in parts numbers. The middle being the Starter relay and the relay closer to the driver is for the Horn which are black in color. In my 97 LSC the last three relays are white in color and all are of same part number but are different to the front three relays within the Eng fuse box. The back three white in color relays are for the Hi Beams, Trunk lid, and the relay that is closer the driver is for the Fuel Pump. Within the Eng fuse box I checked the # 1 fuse for the PCM, and then check the 26, 27 Ign fuses. Then I moved some of the relays around that was for the PCM and the Fuel pump thinking that if one was bad it would show its ugly by now. No changes yet so suspected the Computer or the PCM. I took it out and to serveral places including a dealership to get check but everyone was saying that they were unable to check the PCM while it outside of the car. So, I done some more reading and everyone was saying that PCM don't go bad very often. So, I put the PCM or computer back into the car and started throwing parts at it on the fuel side because I had little or no pressure at the shretter check valve.
I replaced the fuel cut off switch, regulator, filter, and then the pump and still wasn't getting any fuel though its lines. I also replaced the cam shaft sensor then the crank sensor when I discovored the wires to the plug of the crank sensor was fryed a bit so I repaired it and put it back together. With no luck I started checking for a ground problem and everthing was checking good. I was looking at diagram given to me by the local Ford store and noticed that the Cam / Crank sensors were connected to the PCM and then it clicked within my hard head that the short on the crank shift sensor could be related. So, I started to look at the ignition system and discovered that the power to the PCM relay is coming from two locations one being #11 10A fuse within the dash and the other was #15 30Amp fuse within the engine compartment. I check the big fuse again and it was alright then I check the little fuse for the second time and guess what??? Opps, there she blows boys.... I would say that wiring problem is a fairly common problem within the Marks. I was about to send off my PCM to have it reprogramed. I was glad its up and running and hope that this post may help others that experanced a simular problem. Thanks again all,
Respectfully,
Maskmarkman. :steering
My 97 LSC died while driving at speed down the hwy.
It was short that came from the two wires that is connected to the crankshaft sensor. This short did blow the #11 fuse within the interior side panel fuse box only after I first check the fuse and was installing a new crank sensor. Its only a small 10 amp fuse but it provides the power to the PCM relay which without that we have no PCM or brains...LOL. Without any power to the PCM you won't have anything at all. It would crank but wouldn't fire. I had no fuel pressure or and the fuel pump wasn't pumping. I also didn't have fire at the plugs or coil which is also controlled though the PCM.
Within the gen 2 Marks the PCM relay is located within the fuse box under the hood and is the front relay (to the front of the car) or the first one of three black relays that are all alike in parts numbers. The middle being the Starter relay and the relay closer to the driver is for the Horn which are black in color. In my 97 LSC the last three relays are white in color and all are of same part number but are different to the front three relays within the Eng fuse box. The back three white in color relays are for the Hi Beams, Trunk lid, and the relay that is closer the driver is for the Fuel Pump. Within the Eng fuse box I checked the # 1 fuse for the PCM, and then check the 26, 27 Ign fuses. Then I moved some of the relays around that was for the PCM and the Fuel pump thinking that if one was bad it would show its ugly by now. No changes yet so suspected the Computer or the PCM. I took it out and to serveral places including a dealership to get check but everyone was saying that they were unable to check the PCM while it outside of the car. So, I done some more reading and everyone was saying that PCM don't go bad very often. So, I put the PCM or computer back into the car and started throwing parts at it on the fuel side because I had little or no pressure at the shretter check valve.
I replaced the fuel cut off switch, regulator, filter, and then the pump and still wasn't getting any fuel though its lines. I also replaced the cam shaft sensor then the crank sensor when I discovored the wires to the plug of the crank sensor was fryed a bit so I repaired it and put it back together. With no luck I started checking for a ground problem and everthing was checking good. I was looking at diagram given to me by the local Ford store and noticed that the Cam / Crank sensors were connected to the PCM and then it clicked within my hard head that the short on the crank shift sensor could be related. So, I started to look at the ignition system and discovered that the power to the PCM relay is coming from two locations one being #11 10A fuse within the dash and the other was #15 30Amp fuse within the engine compartment. I check the big fuse again and it was alright then I check the little fuse for the second time and guess what??? Opps, there she blows boys.... I would say that wiring problem is a fairly common problem within the Marks. I was about to send off my PCM to have it reprogramed. I was glad its up and running and hope that this post may help others that experanced a simular problem. Thanks again all,
Respectfully,
Maskmarkman. :steering
