The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - LS Sensors

cebra · 11-09-2018, 03:02 PM

I am doing a lot of research for my swap as I am a bit data driven. I have attached what I can find as far as the sensors on the LS and what they do/where they are that may be useful to someone. Please add or modify as you see fit and I will edit this. Note this isn't technically what the sensor measures as you can get that from the name of the sensor, this is the information I have gathered on what data the sensor gathers and what the ECM does with that information. Such as the fuel sender measures the fuel level is true but the float lifts/drops and as the arm moves it provides contact with a variable resistor that lets a certain ohm of ground current to the fuel gauge to move the needle. This was important information for me to know when choosing a sender for my Wrangler tank...I needed one with the correct arm travel/depth, locking ring, and ohm resistance. I went with a 93 S-10 sender and it fit the bill.

1. Mass Air Flow (near air filter box) - monitors air for fuel MAP
2. Air Intake Temp (near air filter box) - aids in timing/fuel MAP
3. Idle Air Control (throttle body) - controls air flow for idle
4. Throttle Position (throttle body) - monitors air intake into engine for timing/fuel MAP
5. Manifold Air Pressure (intake manifold) - measures air pressure for fuel MAP
6. Cam Position Sensor (engine rear) - measures engine firing for ignition timing and injector pulse
7. Crank Position Sensor (engine near starter) - measures engine speed for ignition timing and fuel MAP
8. Knock Sensors (2 under intake manifold) - look for knocks from pre-detonation to adjust timing/fuel
9. Coolant Temp (DS cylinder head)- measures temp for ECM startup mode, cooling fans, and gauge
10. Oil Pressure - (rear of engine behind intake) measures oil pressure for gauge (see BR3W CITY Notes below)
11. 02 Sensors (2 before and 2 after cat) - Upstream before cat monitor A/F ratio and adjust ECM, Downstream after cat are to bust you during inspection
12. Vehicle Speed Sensor (inside of trans) - provides "speed" to gauge, aids in fuel MAP, needed for cruise control

Good links on sensors (less disregard the notes stating the oil pressure sensor will shutdown motor

http://my.prostreetonline.com/2013/0...to-swap-a-ls1/

https://www.hotrod.com/articles/taki...s-engine-tick/

https://www.ls1.com/forums/f6/list-s...hey-do-159572/

11-09-2018, 03:02 PM	#1
cebra Registered User Join Date: Jan 2018 Location: Durham, North Carolina Posts: 782	LS Sensors - what they do and where they are I am doing a lot of research for my swap as I am a bit data driven. I have attached what I can find as far as the sensors on the LS and what they do/where they are that may be useful to someone. Please add or modify as you see fit and I will edit this. Note this isn't technically what the sensor measures as you can get that from the name of the sensor, this is the information I have gathered on what data the sensor gathers and what the ECM does with that information. Such as the fuel sender measures the fuel level is true but the float lifts/drops and as the arm moves it provides contact with a variable resistor that lets a certain ohm of ground current to the fuel gauge to move the needle. This was important information for me to know when choosing a sender for my Wrangler tank...I needed one with the correct arm travel/depth, locking ring, and ohm resistance. I went with a 93 S-10 sender and it fit the bill. 1. Mass Air Flow (near air filter box) - monitors air for fuel MAP 2. Air Intake Temp (near air filter box) - aids in timing/fuel MAP 3. Idle Air Control (throttle body) - controls air flow for idle 4. Throttle Position (throttle body) - monitors air intake into engine for timing/fuel MAP 5. Manifold Air Pressure (intake manifold) - measures air pressure for fuel MAP 6. Cam Position Sensor (engine rear) - measures engine firing for ignition timing and injector pulse 7. Crank Position Sensor (engine near starter) - measures engine speed for ignition timing and fuel MAP 8. Knock Sensors (2 under intake manifold) - look for knocks from pre-detonation to adjust timing/fuel 9. Coolant Temp (DS cylinder head)- measures temp for ECM startup mode, cooling fans, and gauge 10. Oil Pressure - (rear of engine behind intake) measures oil pressure for gauge (see BR3W CITY Notes below) 11. 02 Sensors (2 before and 2 after cat) - Upstream before cat monitor A/F ratio and adjust ECM, Downstream after cat are to bust you during inspection 12. Vehicle Speed Sensor (inside of trans) - provides "speed" to gauge, aids in fuel MAP, needed for cruise control Good links on sensors (less disregard the notes stating the oil pressure sensor will shutdown motor http://my.prostreetonline.com/2013/0...to-swap-a-ls1/ https://www.hotrod.com/articles/taki...s-engine-tick/ https://www.ls1.com/forums/f6/list-s...hey-do-159572/ __________________ My Daily Driver Build: http://67-72chevytrucks.com/vboard/s...d.php?t=755668 Last edited by cebra; 11-12-2018 at 09:27 AM.