Famous p0172

This




Or this.

 

Yea, just need to make sure the ground is good wherever you clip it.

 

Ok give me one sec ill wire brush a part of the chassis. Thank you so much for helping me out man. I was gonna work the truck earlier but was doing a transmission filtrr change on my brothers tundra and one of the bolts broke and took me 6 fing hours to get it out.

 

Ok so i tested with a ground in a different place and the volts go higher than battery. On dcv 17+

 

With the voltimeter on dcv 10megaohm on white and blue cable its starts at 8 volts and starts climbing. Up all the way to 18 is that normal?

 

No. Not normal.

Is the engine running?
Or is the engine off?

 

Engine off just key switch on.

 

Can you take a picture of your meter when it reads 18v+
Looks like your meter has auto-range. Maybe you are reading it wrong?

 

See if it lights up the test light bright, if it doesn't we will need to go to Connector 2B in the underhood fuse box.

 

It does says auto On the top part.

 

It does light up on white and blue

 

And your sure it's grounded good?

 

I think it's Mv and not Volts.
Like to see what the meter says.

 

It is lighting up on the white and blue wire

 

That's good.
It should be.

But is it BRIGHT?

 

Ok so we need to check the resistance of the heater and if that's good check for power at the PCM Connector E4 Pin 2 (Green).

 

Yes

 

Ok thats with the switch on and same dcv right?

 

The first test checking resistance on the heater is done on the connector attached to the sensor with the meter set to ohms.
The second one at the PCM is with the key on and the meter set to volts DC yes.

 

Ok so i tested the first

Ht1b + b and getting 13.
And on the second one no reading