Overheating

[Canyon Man]

so waited almost 2 hours needle still pegged and hot temp flashing. started truck at took off upper radiator hose and water came pumping out, so water pump ok (i think) so i guess next step would be that rear temp sensor. i already changed out the one on the front of the engine the cylinder head temp sensor. any tips on changing that one...im assuming i will have to take the manifold completely off to get to it

Watch the youtube vid. It shows how to remove manifold. Did you take an ohm reading on the sensor?

 

[wcm7823]

only code is p1299...no I dont own a voltage meter...

 

[wcm7823]

can u post the exact steps to test the sensor..ill get a voltmeter tomorrow. ..ps I know jack about voltmeters

 

[wcm7823]

another thing...cleared the code..turned key on engine off..temp gauge finall bottomed out but the started creeping back up to halfway
also temp now reads 158 through scan tool

 

[IMINYOURCHAIR]

you read 158F what to your best guess is the actual engine temperature?

the P1299 is a code that is set when the ecu goes into "cylinder deactivation" or limp mode in an attempt to pass cooling air through the engine to stave off the damage from excess heat.

 

[IMINYOURCHAIR]

have you tested the wires going from the temp sensor to the ecu/pcm yet?

 

[wcm7823]

engine has been off for about 5 hours...so it should be cold maybe 80 degrees...how do I test wires

 

[wcm7823]

here's the one I took off...noticed some green corrosion on the prongs...took off connector and had a little on them..cleanned the connector best I could but no change

 

[Canyon Man]

Update, It may be possible to change the sensor without removing the intake manifold by removing the sensor with a flex head wrench. I have every tool but that one so I will be purchasing one tomorrow

 

[IMINYOURCHAIR]

engine has been off for about 5 hours...so it should be cold maybe 80 degrees...how do I test wires

well, you won't like this but you have to back probe the wires at the pcm or whatever computer receives their input then check each wire for that sensor for resistance (should be little to no resistance.)