Adrian12 Posted October 21, 2006 Report Share Posted October 21, 2006 hi I've a problem! I checked the ISC and TPS and wanted to regulate the idle gas. and from one day to the other i don't hear the fuel pump if i turn ignition on and start. the engine won't start, i don't hear the fuel pump so i think the engine gets no fuel and can't start the diagnostic mode of the ECM doesn't work until same day! "off" and "warmer" goes until ". ." appears but "88" doesn't appear on turning the ignition on, the check engine light doesn't flash on. the fuses for the ECM are OK! the 2 orange cables to the ECM have 12V and the pink/black one too. both are on the connector P1 and supply the electrical energy any ideas what to check or what to do?? idk what the mistake could be, cables inside the car i think they are OK, because the car stood in the garage and i worked on the "coolant sensor, thermostat, and climate compressor" and so from one day to the other i've this problem. could the "center bulkhead connector" be the reason? this is the connector underhood where the cables go inside (i took off the connector one time and reconnected it, but idk what there could be wrong, it fits perfectly) thanks Adrian12 Link to comment Share on other sites More sharing options...
Ranger Posted October 21, 2006 Report Share Posted October 21, 2006 Fuel pump relay? Link to comment Share on other sites More sharing options...
Adrian12 Posted October 21, 2006 Author Report Share Posted October 21, 2006 fueses and fuel pump relay are both ok but the relay doesn't click on turning ignition on! i think the ECM doesn't give the order to the relay because i've such ECM problems! Link to comment Share on other sites More sharing options...
Cadillac Jim Posted October 21, 2006 Report Share Posted October 21, 2006 Someone with a 1981 shop manual can help more. My thinking is that if it happend while you were working on the car, it is likely a loose connector or a fuse. Check all the fuses, and look at the connectors on the ECM. The fact that the diagnostic mode starts means that someithing is working in the ECM. -- 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...
Adrian12 Posted October 22, 2006 Author Report Share Posted October 22, 2006 i've a shop manual but i've no ideas any more what to do, because there is written chech circuit nr.... and this circuit... and so on and last is, check for PROM or faulty ECM and thats my problem. idk where the mistake is. how can i check a circuit? following the cable is impossible because they are under dash... and the diagnostic mode doesn't work because ".." appears but not "88" and the trouble codes. I've checked already all fuses, alle are ok and fixed and have contacts! the connectors at the ECM aren't loose too. I'm finished and the next us-car-garage is about 300kilometres away and it's too expensive to get the car there....... I'll check all fuses and connectors again, but I'm sure they are ok I'm glad about all ideas so if you have some tell me i'll try everything Link to comment Share on other sites More sharing options...
Cadillac Jim Posted October 22, 2006 Report Share Posted October 22, 2006 Check the fuel pump relay at the contacts with the ignition off to make sure that the actuation coil is grounded. Then, switch to volts and make sure that it isn't getting a signal from the PCM when you turn on the ignition switch. If that shows that the PCM signal is not getting to the fuel pump relay, then all you have left is to check the fuel pump relay output terminal at the PCM to determine that the PCM is bad. If you need a PCM, I would try to get one through the mail and put it in myself. You might be able to get a used one. You are talking in km instead of miles; are you in Canada or Europe? If in Canada, you can use US parts sources. If in Europe, Germany or Sweden might be a better place to look online. -- 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...
Adrian12 Posted October 22, 2006 Author Report Share Posted October 22, 2006 the contacts of the relais are Ok, i put in an other relais too but no change! I've 12V on one pin of the relais, and on 2 pins on ignition on i've about 0.02V! the last 4th pin has no Volt (this pin goes to the fuel pump) I'm located in Austria (Europe, a neighbourcountry of Germany) but here the ECMs are expensive.... so i want to try everything possible to be sure that i need an ECM. is there any possibility to say the relais that it should open? can i put some volts to the 2 pins where only 0.02V are? or is this a bad idea? Link to comment Share on other sites More sharing options...
adallak Posted October 22, 2006 Report Share Posted October 22, 2006 the contacts of the relais are Ok, i put in an other relais too but no change! I've 12V on one pin of the relais, and on 2 pins on ignition on i've about 0.02V! the last 4th pin has no Volt (this pin goes to the fuel pump) I'm located in Austria (Europe, a neighbourcountry of Germany) but here the ECMs are expensive.... so i want to try everything possible to be sure that i need an ECM. is there any possibility to say the relais that it should open? can i put some volts to the 2 pins where only 0.02V are? or is this a bad idea? To check a relay you should apply 12V to where it is supposed to be applied and check the two other pins for continuity (there should be no resistance between them without 12V applied and zero resistance after 12V are applied). Austria (Europe, a neighbourcountry of Germany) ... nice. Is the Netherlands and Holland the same country? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Adrian12 Posted October 22, 2006 Author Report Share Posted October 22, 2006 sry i'm stupid but i don't understand anything^^ ähm how do i know where on the relais i've to apply the 12V and what do you mean with check the two other pins for continuity (i can't imagine what you mean, my english is not the best) and the last point i don't understand is: there should be no resistance between them without 12V applied and zero resistance after 12V are applied no resistance and zero resistense is both the same isn't it ???!?!?!!?!!!!??? it is netherlands, holland is a slang-word you could say, official it's called "niederlande" in english "netherlands" but holland you can say too. it's the same country, north of germany Link to comment Share on other sites More sharing options...
adallak Posted October 22, 2006 Report Share Posted October 22, 2006 sry i'm stupid but i don't understand anything^^ ähm how do i know where on the relais i've to apply the 12V and what do you mean with check the two other pins for continuity (i can't imagine what you mean, my english is not the best) and the last point i don't understand is: there should be no resistance between them without 12V applied and zero resistance after 12V are applied no resistance and zero resistense is both the same isn't it ???!?!?!!?!!!!??? it is netherlands, holland is a slang-word you could say, official it's called "niederlande" in english "netherlands" but holland you can say too. it's the same country, north of germany Oh, sorry. If you pull the relay out you'll se a diagram on it. You will figure out intuitively where 12V should be applied. Position your multimeter (tester) leads at two other pins. There should be unlimited resistance (no continuity) when 12V are not applied and zero resistance (sure it is not zero to be accurate, but very close) when 12V are applied. You should also hear the relay clicking. Thanks for Holland, I was just kidding. The geography is not something most of Americans would care of. LOL The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.