check engine light & bulb light, what?

cre · 12-19-2009, 08:10 PM

The check engine light should always be on if the ignition is in the "ON" position but the car is not running. It's a diagnostic... so you know the CEL is functional. Non of the dash lights should be on with the key in the "Acc" position.

Now, even though you do not have the light when the car is running it doesn't mean there are no fault or diagnostic error codes stored in the ECU. Only the most critical of errors will cause the light to remain lit.

Here's how to check diagnostic codes:
http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx

12-19-2009, 08:10 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The check engine light should always be on if the ignition is in the "ON" position but the car is not running. It's a diagnostic... so you know the CEL is functional. Non of the dash lights should be on with the key in the "Acc" position. Now, even though you do not have the light when the car is running it doesn't mean there are no fault or diagnostic error codes stored in the ECU. Only the most critical of errors will cause the light to remain lit. Here's how to check diagnostic codes: http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->