Fault codes 95 and 87
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 106
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From: Bryant Arkansas
Fault codes 95 and 87
Hope this is in the correct forum.
I am trying to fix a problem on my 91 F250 4x4 with 7.5L 460 engine. I get two codes, 95c Fuel pump secondary circuit fault, and 87c Primary fuel pump circuit fault.
The fuel pump relay was removed and a jumper wire in the connector when I bought the truck. I bought a new relay and put it in place and the truck then would not start. Put the jumper back in and the truck starts right up.
Any suggestions on where to start looking?
I am trying to fix a problem on my 91 F250 4x4 with 7.5L 460 engine. I get two codes, 95c Fuel pump secondary circuit fault, and 87c Primary fuel pump circuit fault.
The fuel pump relay was removed and a jumper wire in the connector when I bought the truck. I bought a new relay and put it in place and the truck then would not start. Put the jumper back in and the truck starts right up.
Any suggestions on where to start looking?
Posting Guru
Joined: Jun 2004
Posts: 1,781
Likes: 1
From: Central NY
How are the other voltages on the Fuel Pump Relay?
The EEC grounds one pin (Control Out)to turn the relay on, but it must have 12v on the other side (Control In). That would correspond to Relay Pin 85 (EEC/ground) and pin 86 (12v switched)
The other two pins are 30, which is Power IN (12v fused from battery) and 87 Power OUT which feeds the fuel pumps thrut he inertia switch.
Since it runs jumpered, I would think the problem lies in the control circuit/wiring. You're either not getting ground from the EEC, or not getting switched 12v which either comes from the Ign Sw, or the EEC Relay
Let us know what you find. Please note that the fuel pumps only run for a second or two when you turn the key to on so You'll need a second person to keep turning the key while you take voltages.
Cheers
Tim
The EEC grounds one pin (Control Out)to turn the relay on, but it must have 12v on the other side (Control In). That would correspond to Relay Pin 85 (EEC/ground) and pin 86 (12v switched)
The other two pins are 30, which is Power IN (12v fused from battery) and 87 Power OUT which feeds the fuel pumps thrut he inertia switch.
Since it runs jumpered, I would think the problem lies in the control circuit/wiring. You're either not getting ground from the EEC, or not getting switched 12v which either comes from the Ign Sw, or the EEC Relay
Let us know what you find. Please note that the fuel pumps only run for a second or two when you turn the key to on so You'll need a second person to keep turning the key while you take voltages.
Cheers
Tim
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 106
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From: Bryant Arkansas
Problem found. The ring connector on the starter solinoid that feeds 12 volts to the fuel pump relay common was corroded in two. Only took me six hours of tracing wires to find it.
oh well. At least time spent working on your truck or fishing is not counted against your life time.
oh well. At least time spent working on your truck or fishing is not counted against your life time.
