The SES light came on and I took it to Autozone and they pulled code 236 and said the turbo sensor. What is this and what part do I need.


Thanks in advance.


Lee

Lee,


it may not be the turbo sensor per sei, it's more an indication turbo output isn't where it needs to be, I'd start troubleshooting the Waste gate and vacuum system to make sure all is correct there, do you have any other mods not listed like maybe a turbo master boost control? I had same problem 2 weeks ago using a turbomaster dialed in tight for 13 psi boost set P0236 code.


Do you have access to a Snap On MT2500 scanner, those are more common to find than a tech 2 they do most of what a T2 does, I have one if you were in the neighborhood we could hook it up.


hard to tell from just the one code lets do the basic trouble shooting verify system is intact before we start replacing stuff 0236 could be boost hi or low it's a summary for an out of range condition.

It is the MAP voltage signal that you're calling the turbo sensor. My soder come off the post of the potential switch (runs off the MAP volt signal) I use for boost control and I had the MIL come on for dtc 36. The Ease enhanced parameter scantool I use showed the turbo sensor volts at .08 volts instead of the normal 1.42 - 1.22 v. My problem was all connection, but it may illustrate the potential for digital analysis. First, is vacuum, vacuum lines and WG solenoid unless you use the mechanical spring arm.

The kind folks at the kennedy diesel web site will show you how to read the codes and what all of them are, also some other neat tricks.

Matt only way Lee can read codes is with a scan tool can't use paperclip trick on OBD II

PCM reads the Boost sensor output at startup. If the voltage is below 1 volt it sets the Sensor Low DTC. If voltage is above 4 volts it sets the Sensor Hi DTC.


The DTC can set any time the engine is running, for same failures.


This can occur if the wiring is open or shorted, if the connector is oxidized or unplugged, or the Sensor is failing\failed.


Simply unplugging the connector and re-inserting it can be the fix.


As mentioned above, any type of electronic boost-jacker can cause the same failure, and would be the first area of inspection.

I guess I'm just lucky with my 95'. I don't want to steer anyone in the wrong direction. Sorry.

This is for the education of all, Matt. The programming is the only part of our 6.5's that we never really own, even though the '94-up won't start without it. The '94-'95 OBD-1 may have the advantage on reading and clearing codes, but think of all that you are still missing. The enhanced OBD-1 scantool I use gives me the readings of about 25 sensors, some twice, but doesn't include PCM reprogramming functions. TDC offset, PCM reset, tire/gear changes all need to be reprogrammed. And last of all, if you want to copy or enhance the eprom you have you need a different reprogrammer that can reflash a chip, and the calibration files because all this programming is written in hex code, automaker encrypted.