bad_brains

Took my recently aquired 22re for a interstate jog, and found that the check engine light will pop on at speed (over ~55 mph). It didn't come one until about 10 minutes of riding at this speed. Nothing appears wrong in the dash dials as far as overheating is concerned. Then when I backed off down close to 50 mph and below, the light went off.

Am I correct to assume that the diagnostic system will not indicate a problem unless the check engine light is on full time?

Any ideas or similar experiences??

maxpower_hd

No. The ECM will, or at least can, hold codes without the CEL actually being on. Do you have a manual? Jump the same two connectors in the DIAG box that you would to check the timing. Then turn the key on and count the blinks.

Here is a link from the manual: http://personal.utulsa.edu/~nathan-b...26diagnosi.pdf

4runnerx3

Mine came on at a certain speed, it was the o2 sensor.