chancecasey

A lot of ALDL/OBD1 cars (88ish-95ish) have a feature where if you turn the ignition on (not start the car), fully press the accelerator several times within a certain amount of seconds (like 6 times within 10 seconds for example) the ECU (DME) will transmit any fault codes by blinking the service engine light. Something like blink 3 times, short pause, blink 1 time, short pause, blink 2 times, long pause for code 312. I know BMWs of this era do it. Has anyone tried this on their 964?

I want to but my engine is out so I don't really want to turn anything on right now.

jimq

It does but It may have start in 91 if I remember correctly which isnt usually the case. Search on here as its been discussed alot of times

pete000

I just came across this. I was tempted on trying it on my car.

http://www.troublecodes.net/Porsche/

chancecasey

Sorry I did not search first - I assumed it was too weird. Doh!

JasonAndreas

Bill Wagner has the procedure posted on his Rennlist Website. You can do the same thing with a non-obd2 993 but the codes are different.

alan911sc

Check engine light flash method works on my 1990 C4.

LouZ

Do you know your production #?

I don't believe that my '90 C2 has the feature - it was #2010 off the assembly line.

C24FUN

My '90 C2 did not have this feature when I bought it in 2001 (DME 964 618 124 01). After hearing about this capability and researching a bit, I bought an EPROM chip from a 964 618 124 03 DME for $15 on eBay, put it in my DME unit and the function worked perfectly. (Gas pedal to the floor while turning the key to dash indicator on position, wait 'til the check engine light blinks, foot off the gas and count the blinks).

I'm not sure what models or years got the -03 DME but I understand it was originaly a California requirement to have some self diagnosis capability.

Jim G.

Bill Wagner

Cars originally destined for California in 1990 had the CEL installed. I'd think that some of them have since made their way out of that state, so it's possible you might find one anywhere now.