sensors/emissions and what it all does - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-01-2008, 08:08 PM   #1
Jeeper
 
4.0l sahara's Avatar
 
Join Date: Apr 2007
Location: shelton,ct
Posts: 2,228
Arrow sensors/emissions and what it all does

I've decided to make a list of all the computer's sensors and emission's stuff and what it all does.


MAP OR MANIFOLD ABSOLUTE PRESSURE-This sensor reads the pressure in side the intake manifold. The computer then uses this info to calculate air density and determine the air mass flow rate. Then it uses that to determine the correct fuel flow needed.

MAF OR MASS AIR FLOW SENSOR-This sensor tells the computer the mass of the air entering the engine and the computer uses that info to deliver the correct fuel mass to the engine.

IAT OR INTAKE AIR TEMP SENSOR-This sensor reads the incoming air temp.The computer uses this information to calculate the proper injector pulse width and spark advance.

CTS OR COOLENT TEMP SENSOR-This reads the coolent temp and sends that info to the computer.

TPS OR THROTTLE POSITION SENSOR-This sensor tells the computer where the throttle is located. It does this by changing it's resistance. The computer uses this info to change ignition and fuel timing.

KNOCK SENSOR-This sensor is mounted on the block and listens for any knocks or pings. If the computer detects any pings or knocks it will retard the timing to try to correct the problem.

IAC OR IDLE AIR CONTROL-This device regulates the amount of air let into the engine during idle. This allows the computer to control the idle rpms.

o2 SENSOR OR OXYGEN SENSOR-This sensor reads the oxygen level in the exhaust gases. This info is what sets the correct air/fuel mix for the motor. The use of these sensors helps reduce emissions. It also improves fuel millage. There are normally 2 of these sensors. There is a upstream in the exhaust manifold. This one sets the correct air/fuel mix. Then there is the down stream sensor. It's located behind the cat and is looking to see if the cat is doing it's job.

I thought that maybe this could be a sticky and could help people learn a little of what all these do. 90% of this is right from my head so there may be 1 or 2 mistakes. I'm going to add alot more to this later on.

__________________
99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
4.0l sahara is offline   Quote Quick Reply
Old 03-01-2008, 08:11 PM   #2
Jeeper
 
4.0l sahara's Avatar
 
Join Date: Apr 2007
Location: shelton,ct
Posts: 2,228
delete fixed.

__________________
99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
4.0l sahara is offline   Quote Quick Reply
Old 10-01-2009, 03:50 AM   #3
Jeeper
 
popa's Avatar
 
Join Date: Jun 2009
Location: Romania
Posts: 241
Useful info (I'm kind of new here so I've just discovered it)!
Where are they located? That'll be useful, too.
popa is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 02:42 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC