G 30 Van V8-379 6.2L DSL VIN C FI (1992)
Service Engine Soon Diagnostic Chart
Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This checks for open ECM fuse or open in "Service Engine Soon" light circuit, including I/P connector, printed circuit, and "Service Engine
Soon" lamp. Normal response is lamp "ON."
2. This checks for a shorted ECM. Grounded ECM terminal "A10" will turn the "Service Engine Soon" light "OFF." If disconnecting ECM turns
light "ON," ECM is shorted. Normal response is lamp "ON."
