OKAY, the fuel pump nightmare is nearly over. I have determined that the pink-white wire going from the ECU area behind the passenger seat, up to the firewall at the inertia switch, has a short somewhere. I've snipped the wire just behind the passenger seat, and when I apply voltage to it, the pumps run fine. My plan is to just cut the inertia switch circuit out completely, since it's redundant (the switch is missing on my car anyway, the two leads up front were just jumped together).
Looks like the simplest (and least damaging) way to do this would be to run a wire from the #87 lead at the fuel pump relay, to the pink-white fuel pump wire. However, I have a problem with the power going to the relay. Right now I have the relay out and am just checking at the connector itself; under no load, if I measure the voltage at pin #30 (which is supposed to be connected to the battery positive terminal, through a fuse), it's a little low, like 10.87 volts (other voltage leads show 12+ right now). If I put any load to it (connecting the pink-white wire to run the pumps) voltage drops to like less than 1. So it would seem I have a bad/high resistance connection somewhere.
Unfortunately the #30 lead which is supposedly straight to the battery, disappears within the massive bundle at the ECU connector. Ditto for both ends of the fused lead coming off the battery. Looks like voltage is supplied at the fuse section via a blue wire that goes to the harness. I have verified that the voltage loss occurs at or before the fuse, not in the circuit going from the harness to the relay. I would reeeaaally like to avoid tearing apart that harness....could anyone give me some info on how those blue wires are connected? The diagram makes it look simple, like it should go directly to the battery. But just looking at it, it obviously doesn't, plus it's switched power.
Confused and annoyed. :/
Looks like the simplest (and least damaging) way to do this would be to run a wire from the #87 lead at the fuel pump relay, to the pink-white fuel pump wire. However, I have a problem with the power going to the relay. Right now I have the relay out and am just checking at the connector itself; under no load, if I measure the voltage at pin #30 (which is supposed to be connected to the battery positive terminal, through a fuse), it's a little low, like 10.87 volts (other voltage leads show 12+ right now). If I put any load to it (connecting the pink-white wire to run the pumps) voltage drops to like less than 1. So it would seem I have a bad/high resistance connection somewhere.
Unfortunately the #30 lead which is supposedly straight to the battery, disappears within the massive bundle at the ECU connector. Ditto for both ends of the fused lead coming off the battery. Looks like voltage is supplied at the fuse section via a blue wire that goes to the harness. I have verified that the voltage loss occurs at or before the fuse, not in the circuit going from the harness to the relay. I would reeeaaally like to avoid tearing apart that harness....could anyone give me some info on how those blue wires are connected? The diagram makes it look simple, like it should go directly to the battery. But just looking at it, it obviously doesn't, plus it's switched power.
Confused and annoyed. :/