B Series Truck 2WD L4-2184cc 2.2L 2200 2-bbl (1990)
Emissions Maintenance Light: Service and Repair
Fig. 113 Malfunction Indicator (CHECK) Light Reset
In addition to displaying computer system malfunction codes (codes only on California models), the Malfunction Indicator (CHECK) Light on
Federal trucks acts as an emission maintenance warning. The Malfunction Indicator (CHECK) Light warning light will come on at 60,000 miles
for EGR and at 80,000 miles for Oxygen sensor.
To reset the warning light after servicing the indicated components, locate the Brown/White, Black and the green wires located under the left side
of the dash (taped to the wiring harness above the relay box). At 60,000 mile intervals, unplug the Black wire connector from the Brown/White
connector and plug it into the Green wire connector. At 80,000 mile intervals, return the Black wire connector to the Brown/White wire connector.
