Ferrari Mailing List: Re: UPDATE: 512TR Check Engine Light (1-6)

[Peter Rychel (dino308gt4]

I agree with Doug on this one. I haven’t tried it out, but the Bosch Motronic has a diagnostic switch that once pressed, it will cause the “Slow down” light on the dash to blink in a defined sequence code (items #50 and 51 in the diagram below):

 

https://www.ferrariparts.co.uk/Diagram/Ferrari/512-TR/011-Air-Injection-Ignition

 

I looked it up and the 512 does have a controller (#30 in the diagram below) in between the O2 sensor and the ECU. I’m still thinking there could be an issue along this circuit...:

 

www.ferrariparts.co.uk/diagram/ferrari/512-tr/019-exhaust-system-valid-for-usa--cdn--aus--ch-

 

Sent from Mail for Windows

 

 

From: Douglas Anderson
Sent: September 4, 2021 11:38 AM
To: PeterGT4
Cc: 'The FerrariList'
Subject: Re: [Ferrari] UPDATE: 512TR Check Engine Light (1-6)

 

Minor cause is corrosion?

 

Nope.

 

Your OBD system dumped ALL the monitors.  Odds are you’ll see your CEL again once the monitors have tried to run.  Go get a smog test and find out how bad you fail.

 

Vehicles DO NOT heal themselves (nuts) so what EVER set that CEL the first time it is still there.

 

Find the problem (which now is very hard to do since all the tattle tails are gone).

 

Drive your car in good health and keep us posted.  Especially me – heh heh.  I could be wrong.

 

Onward

Doug

 

From: Ferrari <ferrari-bounces+dnt=dock.net [at] ferrarilist.com> On Behalf Of Larry Bard
Sent: Saturday, September 4, 2021 11:02 AM
To: DOUG <dnt [at] dock.net>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: [Ferrari] UPDATE: 512TR Check Engine Light (1-6)

 

This morning first tried simply restarting car. Same result (i.e., Check Engine CYL 1-6 again illuminated). So turned off engine and tried a suggestion passed along by Clyde: turning off battery switch/knob for about a minute, then turning it back on and restarting the engine.  Voila! Check engine light disappeared. I believe Clyde's theory as to likely cause is minor corrosion of wiring over the years. Regardless, the light has disappeared -- at least for the time being.

 

I guess that fellow Clyde really knows something about cars -- especially including the 512TR. 🙂

 

Thanks to everyone who replied -- and of course special thanks to Clyde.

 

From: Ferrari <ferrari-bounces+larrybard=hotmail.com [at] ferrarilist.com> on behalf of Larry Bard <larrybard [at] hotmail.com>
Sent: Friday, September 3, 2021 4:27 PM
To: larry <larrybard [at] hotmail.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: [Ferrari] 512TR Check Engine Light (1-6)

 

All,

 

Just as arriving home this morning from a relatively gentle drive (highways) of an hour or two, check engine light lit. Most likely cause O2 sensor? I'm due for annual inspection anyway, so will certainly have mechanics troubleshoot -- but am I correct that low risk of significant damage that might result from driving it about 10 miles despite check engine light?

 

Thanks,

Larry