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Home >> Mercedes Benz >> 2022 >> Sprinter 3500XD Van Cargo, 2.1L Eng >> Repair and Diagnosis >> General Information >> Engine Performance >> Emissions - Diesel (Basic Glow Plug Checks) >> Diagnosis & Testing >> Glow Plug Controller
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Glow Plug Controller

  1. Make sure coolant temperature is less than 80°F (27°C) before beginning test. Place ignition switch in RUN position and allow glow plugs to cycle. After 2 minutes, crank engine for one second. It is NOT important that engine starts. Return ignition switch to RUN position. Glow plugs should cycle on at least once.
  2. If glow plugs do not cycle, disconnect controller (controller is located on top rear of valve cover). Connect a 12-volt test light between wire terminal of harness connector (terminal "A") and ground. With ignition switch in RUN position, test light should be off. Test light should glow when engine is cranked.
  3. If test light does not glow as specified, repair short or open in the engine harness wire. If test light operates properly but glow plugs do not cycle, replace controller.
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