Thommy Sweden Posted June 17, 2014 Report Share Posted June 17, 2014 Hi, Thommy in Sweden need your help! I have a Cadillac STS, 2001. Have problems with warning lights (Brake,ABS and TC) come on every now and then for no particular reason. When the warning lights are on, the the air condition is not working properly and the parking brake will not come loose. No problem when the warning lights are off. Have tried to "clear all codes" on the dashboard. This works sometimes, but usually not. Often the system refuses to clear the codes. The following codes are current: IPC 1000 PCM P1571 PCM P1644 PCM U1040 RSS C0635 RSS C0615 RSS C0640 RSS C0710 SDM U1040 Have checked the earth connections and connections on each wheel. Have been informed that it might be the EBCM that needs to be replaced, but does this also affect the air condition and TC!? Please, I need your help! Best regards, Thommy Sweden Link to comment Share on other sites More sharing options...
KHE Posted June 19, 2014 Report Share Posted June 19, 2014 The RSS codes are the cause of the ABS/Traction Control warning lights. I don't have a 2001 shop manual but take a look at this thread - it may help out: http://www.cadillacforums.com/forums/cadillac-forum/t-36211.html Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Cadillac Jim Posted June 19, 2014 Report Share Posted June 19, 2014 IPCU0001 Controller Area Network (CAN) Bus Communication (ECM)PCMP1571 Traction Control Torque Request CircuitP1644 Traction Control Delivered Torque Output CircuitU1040 Loss of Class 2 Communications with ABSRSSC0635 Left Front Normal Force Circuit MalfunctionC0615 Left Front Position Sensor MalfunctionC0640 Right Front Normal Force Circuit MalfunctionC0710 Steering Position Signal MalfunctionSDMU1040 Loss of Class 2 Communications with ABS With these codes, your ABS and TC lights will be on if they are CURRENT. Please make a note of which ones are CURRENT. I have a 2002 FSM on DVD and I think it will apply to your car here. I would start by looking at the left front position sensor and making sure it is OK, the connector is clean and tight, and the wires to it are OK. If you can find it, do the same for the steering position sensor. Post back which codes are CURRENT and we will get it from there. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 21, 2014 Author Report Share Posted June 21, 2014 Thanks a lot. I will ask my local workshop to check the position sensor and I will let you know. Have a great day! Link to comment Share on other sites More sharing options...
Cadillac Jim Posted June 21, 2014 Report Share Posted June 21, 2014 The three PCM codes say that the PCM could not talk to the EBTCM through either the network or the dedicated torque request lines that are used in traction control. If any of them are current, you will get warning lights for traction control and/or ABS, and possibly DIC messages about stability, "speed limited to..." etc. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 24, 2014 Author Report Share Posted June 24, 2014 Yesterday I went to the local workshop and they checked the left front sensor and other connectors around all 4 wheels. As far as they understand everything look perfectly ok. All codes was cleared and my Cadillac worked perfect for nearly 2 days! Tonight when I started the car so was all the warning lights back, ABS, Brake and TC. Following codes are CURRENT: IPC U1000 PCM P1571 PCM P1644 PCM U1040 RSS C0635 RSS C0640 RSS C0710 SDM U1040 Looking forward to hear from you. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted June 25, 2014 Report Share Posted June 25, 2014 IPC U1000U1000 Class 2 Communication MalfunctionPCM P1571P1571 Traction Control Torque Request CircuitPCM P1644P1644 Traction Control Delivered Torque Output CircuitPCM U1040U1040 Loss of Class 2 Communications with ABSRSS C0635C0635 Left Front Normal Force Circuit MalfunctionRSS C0640C0640 Right Front Normal Force Circuit MalfunctionRSS C0710C0710 Steering Position Signal MalfunctionSDM U1040U1040 Loss of Class 2 Communications with ABS Your EBTCM is down. I would start with The 10 Amp ABS fuse in the rear fuse block. The 50 Amp Maxifuse in the underhood fuse block Loose, dirty, or damaged EBCM connector. Bad or missing ground from the rear of the ABS motor. From the 2002 FSM section on P1571, the things to look for before bringing out the code reader and such are: An open in the requested torque circuit An short to ground or voltage in the requested torque circuit A wiring problem, terminal corrosion, or poor connection in the requested torque circuit A communication frequency problem A communication duty cycle problem The PCM is not receiving information from the EBCM Loose or corroded EBCM ground or PCM ground -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 25, 2014 Author Report Share Posted June 25, 2014 Thanks. I will ask my local workshop to have a look at above. Will keep you informed. Have a great day. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 25, 2014 Author Report Share Posted June 25, 2014 As you have already understand, I am not an engineer, only user of my Cadillac..... EBTCM and EBCM is the same module and sitting in front of the left front wheel at my STS 2001 ? Link to comment Share on other sites More sharing options...
KHE Posted June 25, 2014 Report Share Posted June 25, 2014 As you have already understand, I am not an engineer, only user of my Cadillac..... EBTCM and EBCM is the same module and sitting in front of the left front wheel at my STS 2001 ? Yes - it is the module in front of the left front wheel and has brake lines hooked to it. The correct term is EBTCM (Electronic Brake and Traction Control Module). Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 25, 2014 Author Report Share Posted June 25, 2014 Thanks, Kevin. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted June 26, 2014 Report Share Posted June 26, 2014 They dropped the "T" in the FSM in later models for some reason. EBTCM and EBCM are interchangeable as they are identical in the schematics. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 26, 2014 Author Report Share Posted June 26, 2014 Thanks for info, Jim. I have checked and cleaned the fuses myself, but unfortunately it didn't help. The workshop will check the EBTCM on Monday. If you or anyone else has further ideas about the cause of my problems, I would appreciate it if you could inform me so that the workshop also can check this.Guess it's EBTCM problems, as you mention above ..... or maybe that EBTCM should be replaced with a new one!? Link to comment Share on other sites More sharing options...
Göran W Posted June 26, 2014 Report Share Posted June 26, 2014 Hej Thommy! Kolla framför allt det Jim har markerat med rött ovan dvs jordkontakt alltifrån polskor, jordflätor, jordpunkter på karossen till direkt jordning av EBCM. Det räcker inte med att de ser ok ut - de måste demonteras, rengöras och fettas in med t.ex. vitt vaselin innan återmontering. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 26, 2014 Author Report Share Posted June 26, 2014 Hej Göran, Tack för ditt inlägg, men var sitter PCM (Powertrain Control Module) ? Link to comment Share on other sites More sharing options...
Göran W Posted June 26, 2014 Report Share Posted June 26, 2014 Ooopps.... Har tyvärr ingen verkstadshandbok för 2001 så jag vågar inte svara på det. Borde dock vara troligare att felet sitter i/vid EBCM. PCM sitter förmodligen mer skyddat och kanske t.o.m. inne i kupéen. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted June 27, 2014 Report Share Posted June 27, 2014 The PCM is under the air cleaner. The intake path is a cool air port behind the left headlight, to a port into the engine compartment covered by a large plastic box. The air flows over the PCM cooling fins, then through the air cleaner element, then out the long L-shaped hose to the fuel injection throttle body. The PCM rarely gives any trouble at all. The EBCM, on the other hand, has a motor and two relays that can wear out. I see nothing in your codes that would lead me to believe that there was any problem with the PCM. On the other hand, it's clear that the EBCM is failing to perform its functions and also failing to communicate over the car's network. I would not touch the PCM until the EBCM codes were taken care of. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Göran W Posted June 27, 2014 Report Share Posted June 27, 2014 Thanks Jim! Link to comment Share on other sites More sharing options...
Thommy Sweden Posted June 27, 2014 Author Report Share Posted June 27, 2014 Thanks both of you and, on Monday, I will inform you about the results of the visit to the workshop. Have a great weekend! Link to comment Share on other sites More sharing options...
Thommy Sweden Posted July 1, 2014 Author Report Share Posted July 1, 2014 My Cadillac is back from the workshop and they have carefully checked all connectors, ground and wire conditions. All connectors and ground connectors has be cleaned and checked...as recommended. Unfortunately I still have the same problems as before and all codes comes back after clearing the codes. Same codes are CURRENT as mentioned earlier. ...so I still need your help to solve this annoying problem with my dear Cadillac. Look forward to hearing from you shortly. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted July 1, 2014 Report Share Posted July 1, 2014 If all the EBCM codes are CURRENT and the fuses and grounds are good, then the next step is to try a known good EBCM. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Thommy Sweden Posted July 2, 2014 Author Report Share Posted July 2, 2014 Can you recommend a company that can repair the EBCM ? Can't anyone in Sweden.... Or is it recommended to buy a new one!? Göran W - Do you know where it can be repaired in Sweden? Link to comment Share on other sites More sharing options...
Göran W Posted July 2, 2014 Report Share Posted July 2, 2014 Where do You live? Link to comment Share on other sites More sharing options...
Thommy Sweden Posted July 2, 2014 Author Report Share Posted July 2, 2014 In Höllviken. (South of Malmö) Link to comment Share on other sites More sharing options...
airmike Posted July 2, 2014 Report Share Posted July 2, 2014 Can you recommend a company that can repair the EBCM ? Can't anyone in Sweden.... Or is it recommended to buy a new one!? Göran W - Do you know where it can be repaired in Sweden? Tommy Sweden, in case you haven't heard that statement by Cadillac Jim, "known good part", I would highly recommend it. You buy a new or rebuilt and do not KNOW it is in working condition. That is the reason a shop will keep a known good part around for diagnosis. Then replace with new etc.. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.