V850R Posted November 17, 2020 Report Share Posted November 17, 2020 Hello I have been fighting an issue and I believe it is because my ECU is not getting constant power. I think that the constant power is suppose to go to the 101/102 Relay. I tested all the fuses and fuse 1 ECU power gets power when I turn the ignition on as it should but when I tried to test the 101/102 relay base to see if that was getting constant power I could not get the test light to light up. 1. Is 101/102 the constant power supply I am looking for? 2. How do I properly test the relay base to see if it has constant power? 3. If I am way off. Where do if find the constant power and how do I test to make sure it is getting constant power? Thanks! Link to comment Share on other sites More sharing options...
gdog Posted November 17, 2020 Report Share Posted November 17, 2020 Uh, I think it's #3? The ecu gets constant (non-switched) 12v pwr on pin A26 directly from the battery; it does not go through any relays. There are some relays that are fed constant pwr, but doubt 101/102 is one of them. What's the issue you're trying to fix? Link to comment Share on other sites More sharing options...
V850R Posted November 18, 2020 Author Report Share Posted November 18, 2020 Hey gdog thanks for getting back to me! I live in California and I am trying to pass smog. My cars emission monitors set without problem But the problem is that when I turn the car off the monitors go back to not ready. I believe it is because my ECU is losing power when the car is off so it is not able to save that the monitors are set. So my idea is to check constant power. 1. California allows two monitors to be not ready for my year. 2. I have asked over ten smog shops if they would run the test without turning off the car they all say that they have to turn it off to check that the CEL is working properly. Link to comment Share on other sites More sharing options...
flyfishing3 Posted November 18, 2020 Report Share Posted November 18, 2020 I don’t know how to do it, but if you wanted to ride dirty. Rig up another battery somewhere Link to comment Share on other sites More sharing options...
gdog Posted November 18, 2020 Report Share Posted November 18, 2020 On 11/18/2020 at 12:47 AM, V850R said: Hey gdog thanks for getting back to me! I live in California and I am trying to pass smog. My cars emission monitors set without problem But the problem is that when I turn the car off the monitors go back to not ready. I believe it is because my ECU is losing power when the car is off so it is not able to save that the monitors are set. So my idea is to check constant power. 1. California allows two monitors to be not ready for my year. 2. I have asked over ten smog shops if they would run the test without turning off the car they all say that they have to turn it off to check that the CEL is working properly. CA is such a PITA when it comes to smog tests! Not sure off-hand about the 2 monitor limit but volvo 96 to 98 MYs have known issues regarding OBD2 monitors which should get you a waiver on that front. Read more: http://volvospeed.com/vs_forum/topic/170393-convert-daily-driver-850-to-44/?do=findComment&comment=2381729 Link to comment Share on other sites More sharing options...
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