No 12 volts at cold sensor or fuel injectors.

SEAN1073

MEMBER
2012 TOYOTA PICKUP

Hi.I have a toyota truck.2wd.1992.170+ miles. Reg cab. Stick. What the prob. Is it wont start.I check for 12 volts and not geting any at the fuel injectors or cold sensor. But if I put a 12 volt generator at the cold start injector the one on top of the throttle body. It would run. But then die when I could not keep up with the timing! I replaced the O2 sensor and the fuel pump three times and the battery. Now some one on justanswers. Com said it might be the electronic starter relay and gave a schmatic and it shows the injectors coming off the relay. But is that true and could it be something else before I pay them. Can you help? Thanks sean

2 Replies

LOSONE

MECHANIC
1,616 POSTS

Sean, it is a good idea to ALWAYS go back to basics when trying to solve a problem like you have and not replace a lot of parts. Before you do anything check ALL fuses.

The power to the injectors come directly from the ignition switch on a red/black wire. It is a separate portion of the switch that is fed 12V from fuse AM-2. It is either one of the following.

1 Bad fuse
2. Bad ignition sw (rare)
3. Broken connection where the wires split to go to the ignitor. Check the red/black wire on the ignitor. If that has 12V then the problem is the connection where 4 wires are connected. If not the problem is either the switch or the fuse.

Good luck