ECU not responding, can't read codes

02 tacoma 2.7l stalled while driving. OB doc won't respond to reader. Cranks but no start, check engine light was on before stall now no check engine light

 

I did ,I tighted the bolt but it does have power steering fluid or something on it. MAYBE not getting contact, is that possible to cause not start and ecu to not respond

 

The OBD does have its own fuse, have you checked it?

 

I check the fuses are good

 

Yeah, I checked the fuse is good.

 

I had a bad ECU on my 96 and had to replace it with a used one to read codes. I understand it’s more common on the 95-97s, but it’s still a possibility, especially if you have water leaking in somewhere.

 

The MIL/ CEL still lights when your ignition switch is in run?

Did you double Check your code reader will connect on other vehicles?

How long have you been attempting to start?

Has the battery discharged to the point The ECM has gone into hibernation?

Plenty of fuel in the tank??

 

Ran a wire from battery to a switch to ignition fuse. Turn on switch turn key and it starts. Why???

 

Have you checked your AM2 fuse 30A?

 

I think so ,but will check again

 

If that's good (I'm assuming your powering up the IGN Fuse 7.5A?) then you need to go the the ignition switch and check for power in on Pin 7 (White/Red) and out (with the key in the run position) on Pin 6 (Black/Red).

 

It runs with this wired this way. Is it safe to dive like this for a while

 

I will try this this weekend. Thanks

 

I don't see why not, I would reccomend putting a fuse in your jumper wire though just in case something shorts.

 

Thanks, will do!

 

Just wondering. If it works with switch from battery to inside fuse box ignition fuse .does that mean a short some where between battery and that ignition fuse

 

Hope this helps

 

I'm thinking failed ignition switch, that's why I wanted you to check power in and out of the switch as that's where the IGN fuse get's it's power from.

 

OMG Glamisman/DM

Excellent diagrams !!!!!

I have to ask
do y’all have access to same diagrams for 96 2.4L? Xtra C/2wd
Thanks
Steven