Trac off, abs, svs...

[Marrko]

Ok here's the deal. I had a huming noise coming from the front and ect. and the trac off, abs and svs liths came on from time to time. I bought a new wheel hub, the noise disapeared, everything's great but i still get the trac off, abs and svs lights come on from time to time. so what else could be wrong? what could be causing them to light up?

P.S. When the abs, tracc off and svs lights come on, i stop the engine off and start it again and the lights dissapear... so any thought?

[super white alero1]

check to make sure the connection is tighten, disconnect and reconnect all the hub sensor. If light all 3 lamp is still lit, you need to hook a scanner run data check on the BCM, look for the code Cxxxx - FF-LH speed sensor circuit.


Oops I notice your in Lithuania, in that case sorry, dunno if you can get OBDII reader there.

[Marrko]

We hawe those OBDII readers, where not like from the stone age or smth :D

i'll check the connections tomorow... thnxi hope it will help...

[cherrington17]

We hawe those OBDII readers, where not like from the stone age or smth :D

i'll check the connections tomorow... thnxi hope it will help...

:lol: apparently you live in bratislava from eurotrip. :lol:

[Marrko]

laugh all you want :P soon my secret project will be compleated and my alero will be the most moded alero in whole europe :P maybe in asia africa and australia too :P :D but first thing first i need to fix this minor problem...

[lonnie]

laugh all you want :P soon my secret project will be compleated and my alero will be the most moded alero in whole europe :P maybe in asia africa and australia too :P :D but first thing first i need to fix this minor problem...That would be true if you put the corner reflects back in...reverse mod. LOL:jk:

[super white alero1]

Sorry Marrko, i mean you need to have an OBDII reader that can read the body. Most readers can only read P codes, you need something that can read C and U codes.

[Marrko]

ok finaly found a person who can scan my car so here are the codes that i got:

P1625; U1000; U1016; C1226

Please help, can someone tell me what do these codes mean and what actions i have to take to fix these?

[YALEROYNOT]

ok finaly found a person who can scan my car so here are the codes that i got:
P1625; U1000; U1016; C1226

Please help, can someone tell me what do these codes mean and what actions i have to take to fix these?

all the codes I know of start with a P.... and the P1625 isn't listed in my book

found this on line :

P1625....Powertrain control module system reset, or TCM flash checksum fault (Saturn)

DTC U1000 Class 2 Communication Malfunction

DTC U1016 Loss of Class 2 Communication with VCM

C1226 - Right Front Excessive Wheel Speed Variation

[Marrko]

^^^ thnx for your repply but i didn't understand a thing what is wrong with my car :D

[super white alero1]

ABS, Trac, And SVS related to C1226 - Right Front Excessive Wheel Speed Variation.

The other i will look into if you want late.

[Marrko]

i would realy apretiate it :) so how do i fix this "wheel speed variation" what should i check, repair?

[Marrko]

bump!

[Redog]

Wheel hub?

[Marrko]

i've just changed the drivers side one, and about 6 months ago the passenger side one... so i hope it's not the wheel hub...

[CharleyO99Alero]

***

Did you check the tire pressures? If there is too much difference, you will get a speed variation.


***

[Marrko]

tire pressure is the same in all 4 tires... please somewone help!!! what about the other codes?
P1625; U1000; U1016; C1226

[surreal_awakening]

Some of those codes point toward communications issues between modules. There's lengthy troubleshooting procedures to follow. I'll try to type them up tonight.

[lonnie]

Once yall figure this out let me know cause it is happening in mine as well. Every morning I get into the car the low trac light comes on then I move and it goes out. Then a little while later they all (trac off, abs, svs) come on. Need help too. I don't hear any noise though!

[billytheman1188]

speed sensor?

[Marrko]

Some of those codes point toward communications issues between modules. There's lengthy troubleshooting procedures to follow. I'll try to type them up tonight.

I hope youll do that if it's not to hard for you.. because i want to fix these isues as soon as posible and want to moove on on my project...

[natedawg9640]

i've had it happen to me... have the lights go on and restart the car and they go away for a while... i've always blamed it on hubs... when i replaced the hubs(when the light stayed on finally) everyhting was fine... you could try buying a new hub... jacking up the car, plugging the new hub into the passengers side (not actuall put it one) and see if the lights come on... don't spin the wheels obviously. i dunno... I'd bank on it being the wheel speed sensors. the hub doesn't have to be bad for the sensor to burn up. that's what sucks about the design of having them built in to the bearing.

[lonnie]

So with all of this said either it is a bad hub or the wheel speed sensor, and in any event the whole thing has to be replaced anyway. That Effing sucks ass!!

[surreal_awakening]

Ok here we go...alot to digest. I hope it helps you...

P1625:

Alldata doesn't show this, but as yaleronot said, a google search shows Unexpected TCM System Reset

U1000:

DTC U1000 Class 2 Data Link
DTC U1255 Lost Communications

These DTCs set when the control module does not receive a message that it was expecting from another control module, and does not know which control module did not send that message.

1. If the DTC U1000 or U1255 is set in history with other DTCs set current or history, diagnose the other DTCs first.
2. If the DTC U1000 or U1255 set current, this usually indicates a module that is currently not communicating or a configuration issue. For example, if the control module is configured for an option (ie: Onstar, Keyless Entry, Memory Mirrors, etc.) that the vehicle does not have, it may expect to receive a message regarding this missing feature. This would usually occur due to the control module being recently replaced and incorrectly setup.
3. When the DTC U1000 or U1255 is current, the module that is not communicating may not even be listed on the Tech 2 on the Diagnostic Circuit Check/Class 2 Message Monitor list.
4. If the DTC U1000 or U1255 has set in history without other DTCs, replacing the control module setting the DTC is most likely NOT the solution. The module that has set the code is looking for an input from another module that is not communicating. Since the module did not receive an input that it is expecting to see, it sets a U1000 or U1255 which indicates there was a loss of communications. Look at the customer's complaint (ie: intermittent, erratic tachometer operation); this will probably be a better indication of the control module that is the source of the concern. Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition.

See also:
http://i266.photobucket.com/albums/ii247/surreal_awakening/1999%20Oldsmobile%20Alero/U1000-1.gif
http://i266.photobucket.com/albums/ii247/surreal_awakening/1999%20Oldsmobile%20Alero/U1000-2.gif

U1016:

CIRCUIT DESCRIPTION
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the ID number of the module which sent the message for Slate of Health monitoring (Node Alive messages). A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an ID number is learned by a module, it will monitor for that modules's "Node Alive" message. Each module on the class 2 serial data circuit which is powered and performing functions that require detection of a communications malfunction is required to send a "Node Alive" message every two seconds . When no message is detected from the Powertrain Control Module (PCM) for five seconds , DTC U1016 is set.

CONDITIONS FOR SETTING THE DTC
The ignition is turned to the ON position, and a module on the class 2 serial data circuit does not receive the PCM ID for 5 seconds .

CONDITIONS FOR CLEARING THE DTC

* A current DTC will clear when a "Node Alive" message from the PCM is detected on the class 2 serial data circuit or at the end of the current ignition cycle.
* A history DTC can be cleared with the scan tool.

DIAGNOSTIC AIDS
When multiple Loss of Communication DTCs are set concurrently, the cause is likely to be two opens in the class 2 serial data circuit. Use the Data Link Schematic in order to determine the location of the opens.

See also:
http://i266.photobucket.com/albums/ii247/surreal_awakening/1999%20Oldsmobile%20Alero/U1016.gif

C1226:

CIRCUIT DESCRIPTION
As a toothed ring passes by the wheel speed sensor, changes in the electromagnetic field cause the wheel speed sensor to produce an AC voltage signal. The frequency of the AC voltage signal is proportional to the wheel speed. The amplitude of the AC voltage signal is directly related to wheel speed and the proximity of the wheel speed sensor to the toothed ring. The proximity of the wheel speed sensor to the toothed ring is also referred to as the air gap.

CONDITIONS FOR SETTING THE DTC
DTC C1226 can set when the brake is OFF.
DTC C1226 detects a situation in which the right front wheel acceleration or deceleration is beyond specified limits.

ACTION TAKEN WHEN THE DTC SETS

* A malfunction DTC stores.
* The ABS disables.
* The ABS warning indicator turns ON.

CONDITIONS FOR CLEARING THE DTC

* The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
* 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF.

DIAGNOSTIC AIDS
The following conditions may cause an intermittent malfunction:

* A poor connection
* Rubbed-through wire insulation
* A broken wire inside the insulation

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.

If the customer's comments reflect that the amber ABS warning indicator is ON only during moist environmental changes (rain, snow, vehicle wash), inspect all the wheel speed sensor circuitry for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:

1. Spray the suspected area with a five percent saltwater solution. Add two teaspoons of salt to twelve ounces of water to make a five percent saltwater solution.
2. Test drive the vehicle over various road surfaces (bumps, turns, etc.) above 24 km/h (15 mph) for at least 30 seconds.
3. If the DTC returns, replace the suspected harness. Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:

o Backed out terminals
o Improper mating
o Broken locks
o Improperly formed or damaged terminals
o Poor terminal-to-wiring connections
o Physical damage to the wiring harness

Resistance of the wheel speed sensor will increase with an increase in sensor temperature.

Use the following procedure when replacing a wheel speed sensor or harness:

1. Inspect the wheel speed sensor terminals and harness connector for corrosion and/or water intrusion.
2. Replace the wheel speed sensor and jumper harness if evidence of corrosion or water intrusion exists.

TEST DESCRIPTION

4. This test checks the wheel speed sensor for the proper resistance value.
5. This test ensures that the wheel speed sensor generates the proper voltage.
6. This test checks for a short between the wheel speed sensor high and low circuits.

10. This test determines if a wheel speed sensor circuit could be shorted when the EBCM is connected.

See also:
http://i266.photobucket.com/albums/ii247/surreal_awakening/1999%20Oldsmobile%20Alero/C1226-1.gif
http://i266.photobucket.com/albums/ii247/surreal_awakening/1999%20Oldsmobile%20Alero/C1226-2.gif
http://i266.photobucket.com/albums/ii247/surreal_awakening/1999%20Oldsmobile%20Alero/C1226-3.gif

[lonnie]

Holy Shit thats a long post, but Thanks surreal but I want to watch my kids grow up, and I don't have a millenium to test it..LOL!!:thumb:

[surreal_awakening]

Just being thorough! The other option is to start throwing money at random parts until it is fixed!! :lol:

[lonnie]

Just being thorough! The other option is to start throwing money at random parts until it is fixed!! :lol:Thats the kind of help we need around here!!

[zzyzzx]

I just got a code that says U1255 ABS.
Just that one code, no others.
I am reasonably sure that my OBD2 reader doesn't show ABS data (if there is such a thing) but it would do ABS codes if I had them (or so it claims).
I was getting "Low Trac" and so I turned off the traction control and the low trac light doesn't come on, and it no longer feels like the transmission is slipping when the low trac light comes on. I need to rotate my tires anyway, so I'm going to inspect the wiring near the wheel sensors and report back.