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01 honda crv 12v positive ignition source

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Forum Name: Vehicle Wiring Information & File Requests
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URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=90823
Printed Date: May 03, 2025 at 3:45 PM


Topic: 01 honda crv 12v positive ignition source

Posted By: shinjukumaster
Subject: 01 honda crv 12v positive ignition source
Date Posted: February 22, 2007 at 3:58 PM

I'm a noob here. I searched but could not find. Where can I locate a 12V (+ve)  source that is hot only when the engine is running? This is distinct from the ignition key/accessory source.  The application is a piggyback ECU and the vehicle on this occasion is a 2001 Honda CR-V 2.0ES with the fuel injected B20 engine.




Replies:

Posted By: KarTuneMan
Date Posted: February 23, 2007 at 3:09 PM
 12 VOLTS White Ignition harness   + 
 IGNITION BLACK / YELLOW Ignition harness   + 
 ACCESSORY Yellow Ignition harness   + 
 STARTER BLACK/ white Ignition harness   + 
 KEY SENSE Blue/white Ignition harness   - 
 TACH SIGNAL Blue At 1-pin tach test connector   AC 
 Located on firewall above master cylinder. (see photo)
You choose......

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Posted By: shinjukumaster
Date Posted: February 23, 2007 at 3:25 PM

Thanks. OK, there's a few to choose from. I don't think I can use tach. But which of the others will be hot 12V +ve with the engine running and drop to 0V if/when the engine stalls? Basically this is a requirement for a 'run' only signal for safety reasons  - to shut off a gas (LPG) ECU.




Posted By: INSTALLER_MSS
Date Posted: February 27, 2007 at 12:04 PM
the ECU should have a tach input and see that the engine has stopped and in turn shut off the pump

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