G 20 Van V8-379 6.2L DSL VIN C FI (1992)
Malfunction Indicator Lamp: Testing and Inspection
"Service Engine Soon" Light "on" or Won't Flash Code 12
Diagnostic Circuit
Circuit Description:
When the engine is started, the ECM grounds terminal "A10" to turn "OFF" the "Service Engine Soon" light. When ALDL terminal "B" is
grounded it alternately grounds and opens "A10" to flash a code.
