Emissions Maintenance Light: Service and Repair

Fig. 4. Maintenance Required Module and Reset Switch:

Location

The maintenance required module is located in the instrument cluster behind the fuel gauge (standard cluster) or tachometer (optional cluster). Refer to Fig 4.

Reset Procedure

1. Remove the instrument cluster bezel, and then the fuel gauge, or tachometer (optional cluster).
2. Turn the ignition key to the ON position, do not start engine.
3. Insert a small screwdriver into the hole in the module and depress the reset switch.
4. Install the fuel gauge, or tachometer (optional cluster), and then the instrument cluster bezel.

CAUTION: There is no test procedure for this system. Any attempt to test it will result in damage to the system components.

Operation

This system is designed to act as a reminder that scheduled vehicle emissions maintenance should be performed. It is not intended to indicate a warning or that a state of emergency exists which must be corrected to insure safe vehicle operation.
The components covered by the system include the EGR system, PCV valve, oxygen sensor, delay valves, vacuum controlled orifice, fuel tank vapor valve, and bi-level purge valves.
The maintenance required system is based on a time measuring module which uses ignition-on time to calculate maintenance intervals.