No Start - numerous codes

Howdy. My 2012 Tundra with the 4.6 recently died going down the road. Towed it home and had codes read. It has a bunch of Cam sensor codes.

P0010 Camshaft position sensor A actuator circuit (Bank 1)
P0013 Camshaft position sensor B actuator circuit/open (Bank 1)
P0343 Camshaft position sensor A circuit high (Bank 1)
P0368 Camshaft position sensor B circuit high (Bank 1)
P1343 Camshaft position sensor A high input (MRE)

Anyone got any idea what might cause this?
Thanks.
Troy

 

Look for evidence of rodents under the intake

 

Thanks for the quick reply French Toasty. I will do that. I assume the intake has to come off to see under there?

 

Yup, looks like rodents probably got to your harness.

 

Maybe just use your peepers with a flashlight, look for a nest or debris(said like David Attenborough)

 

I believe the cam/phase position should be viewable from the front, top of the valve cover iirc.

3 wire sensor iirc

 

Thanks. I can see the Cam sensors and follow the wires till they join a bigger harness that runs behind the intake. Then I assume to the computer.

 

Again, iirc, pin 1 and 2 should be the reference voltage. You can check to see what the voltage reading is (key on). And because I'm unsure of the exact wiring, I cant tell you which terminals/pins to check for internal resistance.

 

Actually, I have an idea.

Your fault shows bank 1 issues, should be possible to swap the cam position sensor between banks, clear fault and see which bank the fault comes back in.

 

Good idea. I just tried that and same codes.

 

Next would be trying to find a wiring diagram to very ground and voltage. I'm guessing pin 1 = voltage and pin 2 = ground.

Or the long way would be pin it out to the ECU via continuity.

 

Should I have ground and voltage at the sensor with key on or engine cranking?

 

You can just do key on, that will check the wiring itself. Cranking would check internal function, which we already verified swapping sensors between banks.

 

I have 5 volts and ground at each cam sensor. This truck also has the air injection bypass on it. Could that be causing problems?

 

5v on the position is good,

Did you check the 2 wire actuators as well or no?

I think the internal resistance on the actuator is like 5 to 10 ohms.

 

I will do that now. Should those have power and ground also with koeo?

 

The resistance on all 4 of the actuators is 7.8 ohms.

 

Good question, that one I'm not 100% certain on due to control. Try it and report back. Try across both terminals, if not 12v then maybe try pin 1 to ground for 12v? You might have to pin it back to the ECU as well, typical wire resistance should be less than 1ohm so check that and continuity. Between the pinning and internal resistance, should be able to conclude sensor and wiring on the control valve

 

IMO, that should be kosher, but you'll need to confirm. Might be worthwhile to subscribe to the Toyota service manual for a few days and save everything associated to this.

 

Getting back to working on my Tundra. Does anyone know where the efi relay is located?

 

I got this thing fixed. It ended up being the ECM. I wasn't getting a signal on the white wire at the fuel pump control module. Checked for power and grounds at ECM and all were good so ordered a reman one and it starts good. Thanks for the help.