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Home >> Mercedes Benz >> 1974 >> 280C >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Testing >> Rpm Relay/Switch >> 1975-76 230 Models
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1975-76 230 Models

Disconnect Brown switchover valve, connect test harness, and reconnect valve. Connect voltmeter to test harness (parallel tap). Start and increase engine speed. Below 3600 RPM, voltmeter reading should drop to zero (0) volts. If correct voltage reading is not obtained, replace RPM relay.

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