When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I replaced the Opti, plugs and wires in my 96. LT1. Car now has a high idle 1900-2000, even when warmed up. In addition to that, I now have a Service ASR light on and the ASR off is light on. I did unbolt the ASR unit to get it out of the way when I did the plugs and wires (only way I good get at #1 and # 3 plugs. Everything is plugged in. All the cables look normal coming off the ASR. I removed the ASR unit and reinstalled it. Is there a way to check voltage to the ASR unit? Is there a fuse that might have blown? Any ideas or other things to check?
As a follow up, problem solved. Found that the AC pressure switch pigtail was frayed. No insulation at all on the end of the plug. 3 wires. Pulled the plug off the switch. Car idled up and immediately dropped to 800-900. ASR and service ASR light both were gone. Evidently a signal was being sent to raise the idle. The raise in idle was causing the issues with rge ASR module. At least it’s fixed, now I anxiously await for my next problem to pop up.
i posted the follow up, because too many times people post their problems. They get responses and we rarely know if they ever got the issues solved.
If all you did was change the opti, I'd take a look at the vent system to see if it's causing a vacuum leak
yep, checked it. I feel ike I might have bumped something off. Tomorrow I plan on checking the ASR fuse, It should be in the fuse block behind the ECU.
I used my scanner on the OBD2 port, no codes. I used the paper clip method as well, no codes. No “sys” showing and no check engine light showing.
If you have an ASR light, you have a code. Not and engine code, though. The ASR code will be in a different "module". Did you follow the procedure that Nomake Wan provided?
If you have an ASR light, you have a code. Not and engine code, though. The ASR code will be in a different "module". Did you follow the procedure that Nomake Wan provided?
yep, used the paper clip on #4 and # 12. No codes in modules 1, 4, or 9 (9 is the asr/abs module)
I’m still wondering if there is no power going to the asr assembly.
BTW, I had one member PM me about setting the TV cable. The 96 transmission valve is controlled by the computer. No adjustments at the asr.
You have a vacuum leak. I'm gonna guess at the throttle body, without seeing it. Short of following actual troubleshooting like Tom recommended, you can just poke around looking for a tube that's not hooked up or air suction from a cracked hose or leaky gasket.
You have a vacuum leak. I'm gonna guess at the throttle body, without seeing it. Short of following actual troubleshooting like Tom recommended, you can just poke around looking for a tube that's not hooked up or air suction from a cracked hose or leaky gasket.
Thanks, I’ll recheck all the lines when I get home.
I’m retired, but I still do occasional transplant organ flights out of Pennsylvania.
yep, used the paper clip on #4 and # 12. No codes in modules 1, 4, or 9 (9 is the asr/abs module)
I’m still wondering if there is no power going to the asr assembly.
It's odd to have no codes. You should at least have one code when doing the paper clip. It's however totally normal to not get any codes on your OBD2 reader, because your OBD2 reader only talks to the PCM, and you don't have a Service Engine Soon light, so therefore you won't have any engine codes on your OBD2 reader.
However, every other system in the car is not OBD2, and as such cannot be diagnosed with a run-of-the-mill OBD2 reader. They can be queried using the paperclip method, or can be interrogated by a proper GM Tech 2 (or equivalent scan software).
If no power were going to the ASR assembly, you wouldn't get a 'Service ASR' light. In addition, you didn't mention doing anything to the EBTCM, which is where power to said assembly goes. The EBTCM is located in the compartment behind the driver's seat, and is mounted to the ABS unit.
If however you just mean power going to the ASR throttle relaxer motor, well, easy enough to check that I'd think. It's right there out in the open.
It's odd to have no codes. You should at least have one code when doing the paper clip. It's however totally normal to not get any codes on your OBD2 reader, because your OBD2 reader only talks to the PCM, and you don't have a Service Engine Soon light, so therefore you won't have any engine codes on your OBD2 reader.
However, every other system in the car is not OBD2, and as such cannot be diagnosed with a run-of-the-mill OBD2 reader. They can be queried using the paperclip method, or can be interrogated by a proper GM Tech 2 (or equivalent scan software).
If no power were going to the ASR assembly, you wouldn't get a 'Service ASR' light. In addition, you didn't mention doing anything to the EBTCM, which is where power to said assembly goes. The EBTCM is located in the compartment behind the driver's seat, and is mounted to the ABS unit.
If however you just mean power going to the ASR throttle relaxer motor, well, easy enough to check that I'd think. It's right there out in the open.
Thanks for the reply I got access to aTech2, but I am currently in Atlanta. Should be home for dinner unless our flight scheduler has another trip today,. I will check some items then.
As a follow up, problem solved. Found that the AC pressure switch pigtail was frayed. No insulation at all on the end of the plug. 3 wires. Pulled the plug off the switch. Car idled up and immediately dropped to 800-900. ASR and service ASR light both were gone. Evidently a signal was being sent to raise the idle. The raise in idle was causing the issues with rge ASR module. At least it’s fixed, now I anxiously await for my next problem to pop up.
i posted the follow up, because too many times people post their problems. They get responses and we rarely know if they ever got the issues solved.
What did I do ?
