GM Crankshaft Position Relearn with VXDIAG VCX NANO Tech2win

When a Crankshaft Position Sensor or or PCM is replaced this procedure must be done to clear the check engine light (p1336 DTC). It’s very easy using tech2win and a vxdiag vcx nano gm scan tool as shown.

We’re going to make a quick tutorial on how to reset the check engine light for DTC 1336. that usallay means that the engine requires a crank position relearn.
This happens when you reset the ECM or reprogram it.

I got the old Dell laptop fire up. How to do that real quick with the Teh2win using vxdiag vcx nano for gm.

This is a j2534 scan tool you can get on vxdiagshop.com for like 119 bucks.

It’s plugged into my pc right now and we’regoing to go ahead and show you how to do a crank position relearn.

So you go to tech2win-> North American and select MDI interface.

Select Diagnostics
Select model year select 2002 because it’s a 2002 passenger car

Select powertrain
Select engine type, here 4.6L V8 L37

Read DTC
Fault code: P1336 Crankshaft Position System Variation Not Learned

Go back to Powertrain menu
Select Special Function
Select F4: Crankshaft position variation learn

Because we have a v8 if the cutoff is 4000 rpm if you have a v6 it’s 5150 RPM.

it’s a 3970 so that seems good to know anyway push enter and just not yeah whatever block drive wheels set parking brake

do not apply brake pedal and then we’re gonna go ahead and cycle the ignition on and then off again, and push enter, press and hold and start the engine.

so we should be able to do that checking 24x crank signal test in progress.

I just read it to 4000 rpm you probably heard it.

there learn this ignition so we’re just going to click exit and that’s all there is to it it’s really freaking easy.

it just tells you to floor it and then once it the fuel cutoff happens you just let go that’s it that’s literally it

so just to prove it actually wrong thing to prove it i’m going to go ahead and clear that dtc and it will not come back.