(99 GSX) 1. Check Engine Light but No Codes (DTC's) / 2. Brake Pedal Went to Floor

[norths03]

I've got a 99 GSX and my check engine light came on today. At the time I was logging data and my laptop froze. I was not writing to the ECU, only logging data. I rebooted the laptop and went into ECMlink and checked but no codes were listed. I cleared it anyway but the engine light remained on. I turned the car off and on again but the light remains. I tried checking and unchecking all the possible DTC boxes but nothing helped.

Since I was already driving around I stopped at an advance auto and they were unable to connect with their OBD2 tool. It errored out each time they tried. I plugged ECMlink back in and was able to adjust idle, log data, etc without an issue.

Being new to DSM and to the ECMlink side of things does anyone have an idea of what to try to find out what this check engine light is all about?

Secondarily on the way home I heard some brake squeal (constant vs. the normal only when braking). It went away but when I stopped at a red light near my place the brake pedal went all the way to the floor. I pumped it quickly and after 3 pumps it was back up to strong enough to stop the car (thankfully!!!). A block later it did the same thing, pedal on the floor and hardly any stopping power. Any thoughts on this? I'm thinking it could be a stuck caliper and/or brake fluid that boiled.

Thanks in advance for your help!

 

[dsm_mike1990]

unhook your batt then hook it back up and see if it gets rid of the light or will get it to throw a code.


regarding brakes sounds like your basic loss of pressure check for leaks in lines

 

[ofgofg]

Cel but not showing code; I would say the ecu is dieing a slow intermittent death.

 

[Bolo'sTalonTsi]

I'd say brake master cylinder is gone out

 

[blindboarder_02]

If the caliper was stuck, you wouldn't be getting a sinking pedal. The car would veer to the side.

A sinking pedal is most likely a leak somewhere. Check every component. Master cylinder, brake lines, combination valve, fittings on the calipers, etc.

 

[norths03]

Thanks for the idea's guys. I'll be checking into it tomorrow.

I did try unplugging the battery for a couple minutes but it didn't reset the light or my radio stations. I read somewhere that there is a fuse you need to pull as well, some sort of ecu/radio backup so you don't lose your settings.

I'm considering the full brembo upgrade but the cost is off-putting. Trying to decide of the Cobra front upgrade is a good route or the outlander/ralliart is the way to go. Time for more research.

Thanks to biglady112 on the check engine light. My ECMlink knock setting was at 0. Turning it back to 2 cleared the light instantly.

I did a quick check and didn't find any brake fluid leaking out. I drove it and the brakes felt fine. I topped it off just to be safe but will probably consider a master cylinder upgrade when I do my other brake upgrades.

 

[blindboarder_02]

When you say data logging, were you driving the car more aggressive?

If so, then boiling fluid could very well have been the problem. If you say it felt soft one day, then today it feels fine, I would have to assume the fluid got too hot. I would suggest doing a brake fluid flush though regardless. Fresh unopened brand new brake fluid. Brake fluid will absorb moisture and lower it's boiling point.