and a Tip-O-The-Hat to a man who just saved you $400.00
Low tire pressure warning system
Thread Starter
Instructor
Joined: Mar 2006
Posts: 246
Likes: 1
From: Kansas
Low tire pressure warning system
I have a 1992 LT1 coupe. The "Service LTPWS" light comes on at about 45 mph and stays on. I gather that this means my low tire pressure warning system is not working correctly. My shop told me it would cost about $400 to check out and possibly replace the main unit and/or the sensors in one or more of the tires. I don't mind not having this LTPWS feature at all and just checking the tire air pressure once in a while. But the waring light on the dashboard bugs me. Is there a way to make this light stop coming on without spending a lot of money? Can the LTPWS system be disabled without too much trouble? Thanks for any help.
Melting Slicks
Joined: Dec 2004
Posts: 3,285
Likes: 52
From: Jacksonville, FL
St. Jude Donor '08 thru '26
I've a 90 and I think the system was changed some time during the c4 run...I just don't recall when. That said my Helm manual has a diagnostic flow chart for pulling the codes in the LTPWS and it gives the meaning of each code. If you have a manual and a scan tool you can read the DTC. There is also a diagram of the ALDL terminal and it shows which pins to touch to read the DTC's for the LTPW system.
Tom
Tom
Instructor
Joined: Apr 2005
Posts: 107
Likes: 0
From: eureka ca.
the parts are expensive and each sensor in those early gen's is different. (set for each wheel) chances are that the sensor is gone bad in one or more wheel. the sensors arent like the newer style valve stem they mount inside the wheel and are just expensive... sorry to break it to you. I am not sure that there is a way to actually "make the light go out" with out fixing it....
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
a good used sensor can be had from a salvage yard for about $75. for your year, a new one is about $160 from the dealer.
test each sensor, one at a time by doing this:
deflate one tire to 20 psi, then start the car and drive.....at least 2 mins. and/or 25mph. if the ltpws lamp goes on, then that sensor is good. inflate that tire back to its normal rating (about 35 psi). repeat this for each of the other tires, until you find the one that doesn't illuminate the ltpws lamp --- this will be wheel with the bad sensor. once you've obtained another sensor for that wheel, go to NTB (they only charge $8 for installation of the band sensor for you), and you'll be good to go.
each sensor is color coded with its own part number.
i can't see that the ltpws receiver module would be bad, assuming that both "low tire pressure" and "service ltpws" lamps go on upon startup, then go off after a couple seconds (like the other bulbs in the DIC).
so, you have either $75 + $8, or $160 + $8 for the fix, assuming just one sensor is bad. cost of diagnosis, instead of $400 is $0.
$400 for a simple diagnosis thru the steps i outlined above is what is known as highway robbery. tell your shop to go blow.
test each sensor, one at a time by doing this:
deflate one tire to 20 psi, then start the car and drive.....at least 2 mins. and/or 25mph. if the ltpws lamp goes on, then that sensor is good. inflate that tire back to its normal rating (about 35 psi). repeat this for each of the other tires, until you find the one that doesn't illuminate the ltpws lamp --- this will be wheel with the bad sensor. once you've obtained another sensor for that wheel, go to NTB (they only charge $8 for installation of the band sensor for you), and you'll be good to go.
each sensor is color coded with its own part number.
i can't see that the ltpws receiver module would be bad, assuming that both "low tire pressure" and "service ltpws" lamps go on upon startup, then go off after a couple seconds (like the other bulbs in the DIC).
so, you have either $75 + $8, or $160 + $8 for the fix, assuming just one sensor is bad. cost of diagnosis, instead of $400 is $0.
$400 for a simple diagnosis thru the steps i outlined above is what is known as highway robbery. tell your shop to go blow.
Last edited by Red Tornado; May 29, 2006 at 09:42 PM.
Instructor
Joined: Aug 2004
Posts: 119
Likes: 4
From: Sherwood Arkansas
Originally Posted by Hot Rod 90
a good used sensor can be had from a salvage yard for about $75. for your year, a new one is about $160 from the dealer.
test each sensor, one at a time by doing this:
deflate one tire to 20 psi, then start the car and drive.....at least 2 mins. and/or 25mph. if the ltpws lamp goes on, then that sensor is good. inflate that tire back to its normal rating (about 35 psi). repeat this for each of the other tires, until you find the one that doesn't illuminate the ltpws lamp --- this will be wheel with the bad sensor. once you've obtained another sensor for that wheel, go to NTB (they only charge $8 for installation of the band sensor for you), and you'll be good to go.
each sensor is color coded with its own part number.
i can't see that the ltpws receiver module would be bad, assuming that both "low tire pressure" and "service ltpws" lamps go on upon startup, then go off after a couple seconds (like the other bulbs in the DIC).
so, you have either $75 + $8, or $160 + $8 for the fix, assuming just one sensor is bad. cost of diagnosis, instead of $400 is $0.
$400 for a simple diagnosis thru the steps i outlined above is what is known as highway robbery. tell your shop to go blow.
test each sensor, one at a time by doing this:
deflate one tire to 20 psi, then start the car and drive.....at least 2 mins. and/or 25mph. if the ltpws lamp goes on, then that sensor is good. inflate that tire back to its normal rating (about 35 psi). repeat this for each of the other tires, until you find the one that doesn't illuminate the ltpws lamp --- this will be wheel with the bad sensor. once you've obtained another sensor for that wheel, go to NTB (they only charge $8 for installation of the band sensor for you), and you'll be good to go.
each sensor is color coded with its own part number.
i can't see that the ltpws receiver module would be bad, assuming that both "low tire pressure" and "service ltpws" lamps go on upon startup, then go off after a couple seconds (like the other bulbs in the DIC).
so, you have either $75 + $8, or $160 + $8 for the fix, assuming just one sensor is bad. cost of diagnosis, instead of $400 is $0.
$400 for a simple diagnosis thru the steps i outlined above is what is known as highway robbery. tell your shop to go blow.
Larry
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
Originally Posted by LNO
I've got the same problem on my 96. Dealer diagnosed two bad sensors. How do you know if a sensor purchased from a salvage yard is good?
Larry
Larry
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Michael S. Palmer
Instructor
Joined: Apr 2005
Posts: 107
Likes: 0
From: eureka ca.
the codes will break down to what sensor at what corner is bad. another question I ask since I have seen this a few times is, did you have any tires dismounted? i.e. flat, new tires etc. that can help I have seen tire monitor issues soon after tire work. or maybe due to age a sensor just gave up.......
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
Originally Posted by gmtech921
the codes will break down to what sensor at what corner is bad.
the procedure i outlined would still work as a backup diagnostic, the "manual method". also --- he'll need to get the code(s) cleared from his receiver module --- he won't be able to clear them on his own --- will he need to go to the dealer for that?
Last edited by Red Tornado; May 30, 2006 at 12:08 AM.
Instructor
Joined: Apr 2005
Posts: 107
Likes: 0
From: eureka ca.
pull codes ( ground a-b) if it is a wheelsensor code it will be a 24 (r.r),34 (l.r) 44 (l.f.) 54 (r.f) then replace the appropriate sensor. the code should clear out once all sensors are signaling. hope this helps.
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
Ltpws
Mine came on after playing with tire pressure.once I put pressure
on the factory specs.(on the driver door) the light stayed off.
My 96 cold 30psi. Also if you read your manual it tells you of other reason why this light comes on .
Is it LTPWS or is it SERVICE LTPWS these lights come under strange circumstances such as riding next to another car with LTPWS that has low pressure tires.Damaged sensor (if you had new tires put on recently) ck your pressure on your tires .Makes a BIG differance .
This doesnt mean anything is wrong with your car , you can even have the dealership eliminate the light.
SERVICE LTPWS which is a little differant comes on if you turn the ignition on three times in row within a half hour without moving your car. or if the sensors are missing.
Some weird S--t . Anyway Hope this helps..
on the factory specs.(on the driver door) the light stayed off.
My 96 cold 30psi. Also if you read your manual it tells you of other reason why this light comes on .
Is it LTPWS or is it SERVICE LTPWS these lights come under strange circumstances such as riding next to another car with LTPWS that has low pressure tires.Damaged sensor (if you had new tires put on recently) ck your pressure on your tires .Makes a BIG differance .
This doesnt mean anything is wrong with your car , you can even have the dealership eliminate the light.
SERVICE LTPWS which is a little differant comes on if you turn the ignition on three times in row within a half hour without moving your car. or if the sensors are missing.
Some weird S--t . Anyway Hope this helps..
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
Ltpwsw
Originally Posted by Weely
I have a 1992 LT1 coupe. The "Service LTPWS" light comes on at about 45 mph and stays on. I gather that this means my low tire pressure warning system is not working correctly. My shop told me it would cost about $400 to check out and possibly replace the main unit and/or the sensors in one or more of the tires. I don't mind not having this LTPWS feature at all and just checking the tire air pressure once in a while. But the waring light on the dashboard bugs me. Is there a way to make this light stop coming on without spending a lot of money? Can the LTPWS system be disabled without too much trouble? Thanks for any help.
