G 30 Van V8-379 6.2L DSL VIN C FI (1992)
Engine Control Module: Component Tests and General Diagnostics
Diagnostic Circuit
Circuit Description:
The ECM check is made to determine why the "Service Engine Soon" light remains "ON" or does not flash Code 12. Normally, the ECM will not
recognize a fault for at least 10 seconds after start-up. If the "Service Engine Soon" remains "ON", the ECM has lost power, ground or the signal
that turns the "Service Engine Soon" "OFF" has been lost.
When the engine is started, the ECM grounds terminal "A10" to turn "OFF" the "Service Engine Soon" light. It alternately grounds and opens it to
flash a code.
