October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

ECM Trouble Codes

The ECM receives signals from sensors concerning engine operating conditions. If sensor reading is not what it should be, as compared to what is in ECM memory, ECM will turn on the "CHECK ENGINE" or "SERVICE ENGINE SOON" light on instrument panel, and will store a trouble code in memory.