Bad ECM?

not an expert by any definition unless its pre computer engines, old retired guy here,

I bought my 2012 5.7 4wd tundra new and it has served me well now at 315,000 miles, I've replaced the alternator, battery, steering rack, shocks, tires and all the usual maintenance items like oil,filters etc, but a week ago it just quit running and turns over but no start, been reading this forum a lot because I prefer to fix things myself if possible, pulled a spark plug and no spark, no fuel pump running and no check engine light, fuses and relays are all good, hi and low 4wd light are both flashing, abs, traction , transmission temp lights are on, no comm with the ecm, read a post about someone disconnecting power steering pressure sensor plug to get theirs started so I gave it a try and it cranked right up, (the harness pin measured 5 volts but zero if its plugged in)

check engine came on and I was able to pull codes, and theres a bunch, Im pretty good with old school stuff but this is really getting to me, Im not a fan of electronics, any advice would be appreciated, heres what I pulled,

P0553 power steering pressure sensor/switch circuit high input

P0013 camshaft position B actuator open bank 1

P0023 camshaft position B actuator open bank 2

P0102 mass or volume air flow circuit low input

P0113 intake air temperature circuit high input

P0348 camshaft position sensor "A" circuit high input bank 2

P0368 camshaft position sensor "B" circuit high input bank 1

P0393 camshaft position sensor "B" circuit high input bank 2

P1343 camshaft position sensor "A" high input (mre)

P1614 secondary air inspection system driver bank 2

P2716 Pressure control solenoid "D" electrical

P0013 camshaft position "B" actuator circuit/ open bank 1

P0023 camshaft position "B" actuator circuit/ open bank 2

P0102 mass or airflow circuit low input

P0113 intake air temperature circuit high input

P0348 camshaft position sensor "A" circuit high input bank 2

P0368 camshaft position sensor "B" circuit high input bank 1

P0393 camshaft position sensor "B" circuit high input bank 2

P0553 power steering pressure sensor /switch circuit high input

P01340 camshaft poition sensor "A" bank 1 sensor 2, ignitor circuit #8

P1343 camshaft position sensor "A" high input (mre)

P1614 secondary air injection system driver bank 2

P2716 pressure control solenoid "D" electrical

P0101 mass or volume air flow circuit range/performance

P0894 transmission component slipping

P2714 pressure control solenoid D performance or stuck off

 

Ok so its very odd that you get all those codes coming up. Before this problem, was it running good?

In terms of codes.. usually, its just 1 or 2 main codes that come up that can cause a cascade of other codes to show up. You need to fix that 1 or 2 main codes and then go down the path to clearing the others...

sorry I couldn't be of more help..

 

Did a little reading on this.

Found this "If you run across a 2008 Toyota Tundra (3UR-FE) and have a no start, no ECM communication condition and there is no "Check Engine Light" bulb illuminated during the function check, disconnect the secondary air valves. These have a tendency to short the 5 volt reference line and stop all ECM communication."

Another user reported he had the same problem but it was the power steering sensor that was shorting out and killing all communications with the ECM.

The fact that yours starts with the power steering sensor unplugged leads me to believe the same, the sensor is bad and is disrupting the ECM circuit. In doing so the ECM thinks every system has failed because it cant communicate with them.

With the power steering sensor unplugged, I would clear all the codes in the ECM and the go drive it. I will bet almost none of the codes come back because with the bad sensor out of the equation the ECM can communicate with also those other systems like normal.

You might just need a new power steering sensor, clear all the trouble codes and be good to go. If the truck is running with power steering sensor unplugged, the ECM is not bad or failed

 

The truck first started acting up a year ago when it wouldnt shift out of third gear, I put an aftermarket speed sensor on the transmission and it drove normally until a month ago when sometimes it wouldnt go into reverse and when going from reverse to drive it was a hard shift, I had to drive it for a week and thats when it quit running, engine missed a few times then stopped running, was really concerned about the transmission codes so today I dropped the pan to check out the pressure control solenoid, took it off and resistance is within spec and it actuates with power applied, I didnt hear this before because the pan was on, but when I plugged it back into the transmission it makes a high pitched buzzing sound with key in on position, I tried to get a voltage reading from the plug but no reading which makes no sense if it buzzes when the key is on, this truck is beating me up.

 

update on this saga, installed new power steering pump sensor, I can drive it now but when my speed goes over 25mph the check engine light comes on and 4h and 4l lights start flashing, in the past, the doors would auto lock over 25mph, now they don't, still don't have any 4wd but it runs normal now except for these issues, could the ecm be corrupted?

 

What is the resistance specs for the solenoids? I'm coming up with codes P0761 and P2714, for "C" and "D" solenoids. Thanks

 

have you replace the ecu or complete solve your issues
Have a 2008 tundra 5.7. Cranks no start

 

May need a little more information. Out of gas would be my first guess. If you have a 1/4 tank left, gauge may be jammed up there and you're out of gas. Do you have any codes?

 

it just died one day. Cranks but no start. No ecu communication at first. OBD2 scanner would not connect at all. Engine light would not come on at ignition on. Disconnect some sensors camshaft, throttle body, VVT sensor. Engine light on all the time now it won’t go away. Now I can connect OBD2 scanner but no codes come up. I have disconnected the battery for more than a day to reset ECU but no luck. Have also bridge pin 4 and 13 on the OBD2 plug to reset ecu, no luck. Engine light still on. No codes. Still cranks no start. Replace fuel pump, plenty of gas in tank. Not getting any fuel to engine. Don’t hear fuel pump turn on. Disconnect fuel lines to see if fuel would spray out when starting but nothing. I’m stuck not sure why engine light on and codes come up and why not getting fuel to engine. Any help would be great.

 

I would be looking at the fuel pump ecu. It’s a module on the frame rail near the pump responsible for controlling the pump.

Sounds like you could or still do have a short in the communication lines of the truck. You to verify if it is actually communicating with the ecu.

I might lay underneath it, find the fuel pump ecu and unplug the connector to it. See if you can communicate with the engine ecu then.

 

This is to infinity and beyond my capabilities.... did track this on google

maybe try this as well??
https://www.justanswer.com/toyota/ahbxu-08-tundra-wont-start-no-communiction-ecu-yes.html

 

I’m having some of those codes, and it seems like it’s a signal wire from the camshaft position sensor because its reading on the multimeter pertains to open circuit, I’m fixing to replace the harness, any idea what was the problem?