2004 toyota camry and rs 3.5

2nd Starter Relay Circuit

Im a bit confused with the 2nd starter wire relay.  ok,  30 = 2nd starter, 86 = ground?, 87 = 12 +, and 85 taps into the primary starter wire.  Now, do tap into the primary wire before the starter kill relay, or does it even matter.  Also, I can not seem to find the tach wire on the 04 camry.  It is the 4 cyl, 2.4 l engine.  Can anyone help me?  Thank you

Make sure that you tie into the starter disable after the circuit otherwise the car will not start. 86 is GROUND because the relay doesn't get activated until it receives a (+) from the starter wire anyway so you can have the relay grounded on the coil at all times. Use the injector wire instead of the tach coil wire. It's easier to find and also is less headaches.

FullForce: I suggest separating the two now with a relay as in the diagram because Toyota had these two wires separated for a reason ( one for cold start ) so it's better off that you isolate each wire from one another. It will only cost you $ 3.00 for a relay or possibilities of big headaches later on down the road.

what kind of problems can you see it creating Jeff? I was hesitant at first buy went ahead and tied them together after I saw that they both read 12v with switch in crank position. Is there another way to isolate them with a diode?

You could experience a check engine warning in the future I would not suggest diode isolating the wire because it is a high amperage wire and the diode will burn up within a few or less tries. I found this part of an article about the cold start wire and it's function as to what it does for the cold start valve on the Toyota's:

Most of the Toyotas we see will have a cold start valve and a start injector time switch. The injector time switch, like the ECT, is screwed into a water jacket, as the cold start valve is not needed when the engine is warm. Its operation is simple. When the starter is engaged, battery voltage is sent to one terminal of the cold start valve and to the timed terminal of the injector time switch.

The other terminal on the cold start valve goes to the injector time switch where it gets grounded, opening the cold start valve. At the same time, current is flowing through a heater inside the time switch, keeping track of how long the cold start valve has been open. At a certain time, the switch will open the ground circuit for the valve, stopping fuel flow and preventing flooding.