SES and ASR light

Reply Subscribe

Thread Tools

Search this Thread

May 25, 2008 | 12:41 PM

mechryn

Thread Starter

Racer

Joined: Jul 2005

Posts: 269

Likes: 0

From: Atl Ga

SES and ASR light

Hi Everyone,

I'm a C5 guy who has offered to fix a C4 for a friend. My friends car is a 92 vert LT-1 w/ auto. The car is having an electical issue. I'm hoping someone here can help me track it down. The car runs fine cold, but once it gets warm the car will kind of "burp" and then the SES and ASR light will come on, the AC starts blowing hot, and the speedo stops working. I tried to pull the codes using the paper clip method, but once the lights come on the light wont flash. If I check it before the lights come on I get a code 12(No codes). I've been doing a little reading but havent been able to find a definitive answer. Can someone help me out?

Thanks,
Ryan

May 25, 2008 | 06:39 PM

MickeW

Advanced

Joined: Sep 2005

Posts: 97

Likes: 0

From: Stockholm / Sweden

Hi,
have you checked this ?

http://www.corvette-guru.com/uploads...CMCodePull.pdf

kind regards
MickeW

May 25, 2008 | 10:30 PM

mechryn

Thread Starter

Racer

Joined: Jul 2005

Posts: 269

Likes: 0

From: Atl Ga

ZOMG! Thanks. I found a link to this during some of my searching but the link was broken. I'll have to try this tomorrow...

May 26, 2008 | 01:21 PM

mechryn

Thread Starter

Racer

Joined: Jul 2005

Posts: 269

Likes: 0

From: Atl Ga

Alright,

In section 1.1 I got a code 41(ECM Data Comm Lost)
In section 9.1 I got codes 62(Tach Error) and 72(Serial Data Link Error)

Sound like a bad ECM to anyone else?

May 26, 2008 | 05:07 PM

Rapid Fred

Race Director

Joined: May 2005

Posts: 11,992

Likes: 1,331

From: Middletown, DE

http://forums.corvetteforum.com/show....php?t=2014368

I had the exact symptoms and basically the same codes -- any chance your friend has an aftermarket chip?

I disconnected the battery (neg cable), yanked the aftermarket chip, put it back together, and the car has run fine the last 3 weeks -- no codes, no problems.

At worst you might try disconnecting the battery and reconnecting -- it will erase the codes and may take it out of limp-mode.

Just a shot in the dark....kinda like the old days of kicking the TV to make it work.

I'm still not sure if my ECM is waiting to die, but at least I have my car back.

May 27, 2008 | 01:27 PM

Tom Piper

Safety Car

Joined: Feb 1999

Posts: 3,504

Likes: 4

From: Mexico Beach FL

Quote:

Originally Posted by mechryn

Alright,

In section 1.1 I got a code 41(ECM Data Comm Lost)
In section 9.1 I got codes 62(Tach Error) and 72(Serial Data Link Error)

Sound like a bad ECM to anyone else?

The '92 and '93 are notorious for ECM failures.
And, the ECMs for those years are getting hard to find.

Mine would fail after the engine warmed up and heated the ECM under the hood.
I did not have AC or speedo problems though.

Tom Piper

May 27, 2008 | 07:55 PM

mechryn

Thread Starter

Racer

Joined: Jul 2005

Posts: 269

Likes: 0

From: Atl Ga

Thanks Guys. Anyone else have any ideas?

Jun 8, 2008 | 05:25 PM

L71Maynard

Instructor

Joined: Jul 2004

Posts: 210

Likes: 0

From: Lakewood CO

My car has been doing the same thing. I thought I had fixed this once but it came back. I found a loose ground on the driver's side of the engine block that fixed it for some time. There are 2 ground ports there, one on the rear and one on the side by cylinder number 7. My loose ground was on the side.

Dave