Sensor Usage in OBD1 & OBD2 LTx/LSx Engines
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Joined: Sep 2002
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Sensor Usage in OBD1 & OBD2 LTx/LSx Engines
Primarily, for an LT1 OBD1 or OBD2, is the MAF sensor used during
all modes of operation?
IE: Closed loop and Open Loop?
Second question:
Does anyone have a list of all engine sensors, their role; their correlation with other sensors; Output signal; Effects on the engine?
Example: TPS sensor - used to determine throttle blade angle;
works with VSS, RPM and MAF; 0 - 5 VDC Output level to PCM; controls timing, Fuel Injector PWM.
** Note above example is most likely not accurate! Don't flame me please!
all modes of operation?
IE: Closed loop and Open Loop?
Second question:
Does anyone have a list of all engine sensors, their role; their correlation with other sensors; Output signal; Effects on the engine?
Example: TPS sensor - used to determine throttle blade angle;
works with VSS, RPM and MAF; 0 - 5 VDC Output level to PCM; controls timing, Fuel Injector PWM.
** Note above example is most likely not accurate! Don't flame me please!
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Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
There's a lot of extremely relevant info in this book:
Corvette Fuel Injection & Electronic Engine Control - 1982 - 2001
A review from my website "Reference Books" page:
Corvette Fuel Injection & Electronic Engine Control - 1982 - 2001
A review from my website "Reference Books" page:
Don't by put off by "Corvette" in the title... this is a guide that will give you tremendous insight into the fuel injection systems used on Corvettes and F-bodys, including TBI, TPI, LT1 and LS1. You have to be cognizant of the differences.... Corvettes have dual knock sensors, oil temperature sensors, etc.. And the LS1 Corvettes have a "fly-by-wire" cable-less throttle system that really clouds the issue on things like idle control and TPS on the LS1's. But the book has an excellent overview of fundamentals, emissions and fuels, sensors, the PCM, actuators, fuel systems, tuning, and diagnosis.
Last edited by Injuneer; Dec 8, 2003 at 02:42 PM.
Registered User
Joined: Dec 1998
Posts: 615
From: Pekin, IL, United States
The answer to your MAF question is that it is always used in either open or closed loop. The only time it would not be is if the sensor fails and the car goes into speed density mode, the PCM is reprogrammed to only use speed density mode, or it is a 92-93 LT1, which used speed density and no MAF sensor.
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