QuestionI have a 2001 Toyota 4runner with a 3.4 v6, auto trans, 4x4. I am in the process of installing a Bulldog remote starter. I got the remote starter in and was having problems with the remote recycling after a no start. No bad at this point, just annoying. I decided to try and make the rear window roll down with the remote. When back probing with a power probe to the connector I thought was the window circuit, I believe I back probed to the ECM. I am not sure about this as I don't have the correct wiring diagram to tell me what this wiring harness is for. The wiring connector that I was back probing is on the drivers side down by the kick panel. It has six wires. One is red w/yellow tracer, green w/black tracer, heavier black wire, etc.....when I back probed the green w/black tracer the "check engine light", O/D off light and the "cruise" light all come on on the dash. Maybe these wires go to the vehicle speed sensor and/or trans.
As of now, the truck will not start. Every thing else works. The engine cranks over fine. I have no spark. The "check engine light" does not come on at all. I cannot retrieve any codes or get any communication with my Snap On scanner with the OBDII chip in it. I think that this truck has a pass key system, but when we bought it, it didn't seem to work. I have a duplicate key with no plastic housing that would start the truck. Could the pass key system be the problem and working now?
I have removed all of the remote starter thinking that this might be the problem. Still no workee. I have checked all of the fuses that I can find, all are good.
I am hoping the ECU is not bad, but maybe you can tell me if you think it is. Is there a way to test this ECU to make sure it is faulty or not??
Thanks for any info you can give me
Bruce Dyck
AnswerFirst check the 7.5A STA fuse in the fuse panel, if the fuse is good there is a possibility that the computer may have a problem, it depends on what probe was used, computer terminals should only be tested with high impedance volt/ohm meters of 1 megohm or more, a low impedance test device will damage the ECM, the green/black wire comes from the sta fuse and terminates at the ignition switch, it also connects to the ECU but through another circuit not related to the ignition. If the truck started before with a non-immobilizer key then it does not have the immobilizer system keeping it from starting. I can email a wiring diagram that may help, need an email address. The ECM itself can not be tested other than by substitution of a known good unit.
