View Single Post
Old 09-17-2012, 05:14 PM   #8
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 41,319
 

2003 L-Series 3.0L Sedan
Default Re: changed ECTS now temp guage not woorking

Examine the original sensor and carefully inspect the two pins to be sure they're straight and the wiring harness connector isn't damaged. Now connect the old sensor back on without putting it back into the cylinder head. Just let it hang somewhere. Pull the pcm B+ fuse for a minute to reset the pcm and replace the fuse. Now turn on the ignition and observe the temperature gauge. Hopefully the needle pegging was a simple short that didn't do any harm and resetting the pcm clears any stuck electrons not wanting to move until all power is disconnected.

An electrical short here would be electronically interpreted by the temperature circuit in the pcm as the engine being extremely HOT as in volcano hot. The thermistor would be mistakenly sensing extremely hot temps as very low resistance or a short is the equivalent of a melting engine - the temperature gauge needle pinned all the way to the right even though the engine is cold. Electronically the short is seen as a HOT HOT engine. If no electronic damage occurred internally to the pcm then removing pcm power should allow a nice reset to calm it down for reuse with a correctly connected coolant sensor. The original sensor wasn't the cause of your hard starting problems. Its something else.

Fix this issue first and then continue with troubleshooting other sensors.

REWARD EXCELLENCE!

Add to fdryer's Reputation
Rate the quality of this post and help fdryer reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
fdryer is offline   Reply With Quote