ZR-1 Net Registry Forums - View Single Post - Speedometer shows 120-220 mph idle high

03-03-2007

Probably no codes to display, unless you do have a SES light present.

Check simple things first.
Disconnect battery for 5 minutes and restart.
Prom fully seated.
ECM plugs fully inserted.

Did you touch anything else while doing the battery swap?

03-03-2007	#2
Jeffvette Guest Posts: n/a	Re: Speedometer shows 120-220 mph idle high Probably no codes to display, unless you do have a SES light present. Check simple things first. Disconnect battery for 5 minutes and restart. Prom fully seated. ECM plugs fully inserted. Did you touch anything else while doing the battery swap?