Cadillac sls ? Deville - Seville - eldorado - STS . Does your key have the pellet on the side ? That is a resistor ,an inside the lock cylinder are contacts that touch the pellet on both sides an read the resistance in the instrument cluster . You could measure this resistance with a ohm meter .First the key , then the wires . The lock cylinder has wires coming out of it . If you find these wires under the dash near the steering column . If the resistance is the same at the wires as on the key contacts inside are good . That is the weak link in this system ,after removing an inserting the key a million times wear those contacts . If that is the problem you can do a by - pass . Go to radio shack an by resistors to equel the key pellet . and at the wires solder in the resistors . Watch this video , you can fix it yourself if your handy !
GM VATS Key Resistor Key Security Bypass
https://s18.postimg.org/6rlghkfqh/fuel_pump.jpg
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The load side of relay is that line with arrowhead. When the relay is energized that line moves to other terminal. You can see the fuse for load side of relay.
The right side of relay is the control side, has to have voltage and ground. The ground is chassis ground, the voltage should come from pcm.
Now, if you have problem with more than one system, like, no spark--fuel or fuel injector pulse. I look for a rpm signal. I don't know if trouble codes will help, but, I'd check applicable codes, anyway.
The fuel pump is located inside the fuel tank. You can access the fuel tank thru the trunk. Inside the trunk and underneath the carpet, there is a access panel. Remove the five screws and lift the access panel. There under the panel you will see the pump. Disconnect it and take it to the auto parts store as they usually want the old one for an exchange. Joe
I don't know those codes, you can google them and find them, or try googling "OBD-II codes" (OnBoard Diagnostics) to find the codes and meaning.
What I jumped in to say, was it wouldn't matter if you removed the positive or the negative cable first, AS LONG AS THE IGNITION KEY WAS IN OFF. So if key wasn't in ON, you can take off either cable first. People only take off the negative first as a safety precaution: if you take off positive first, there is a chance you could cause sparking with your wrench touching any metal on the car, or if the positive cable terminal touched metal before you take off the negative. Always, just for safety, take off the negative first. Also never take off the battery when the key is in ON.
0507- Idle control system too high.
0650-Malfunction indicator lamp (MIL) control circuit malfunction
0741-Torque Converter Clutch circuit performance or Stuck Off
The vent is not the problem. When the transmission gets hot the valve body leaks enough fluid so pressure is no longer sufficient to apply the clutch packs completely. If this has been going on for a while then a complete overhaul with a new valve body is the only fix.
