Test 1 - No "Check Engine" Light: Notes
There should always be a steady "CHECK ENGINE" light when the ignition is on and engine stopped. The Electronic Control Module (ECM) will also turn on the light if ECM senses a malfunction, or ECM fails.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
Battery voltage at circuit No. 5 is protected by a 10-amp in-line fuse. Using a test light connected to 12 volts, probe each of the system ground circuits to be sure a good ground is present.