P2100 Mercedes: Throttle Control Motor Relay Circuit Open

Fault Code P2100 Mercedes throttle control motor realy circuit open.Power supply for the throttle motor relay is provided to the ECM through throttle control motor relay.The throttle control motor realy ON/OFF is controlled by the engine control module (ECM).

When the ignition switch is turned ON,engine control module sends ON signal to throttle control motor relay and battery voltage is provided to the engine control module.When ignition switch is turned OFF engine control module sends OFF signal to throttle control motor relay and battery voltage is not delivered to the engine control module.

Cause Of P2100 Throttle Control Motor Relay Circuit Open

1.Harness open of Throttle control motor relay

2.Poor electric connection to Throttle control motor relay circuit.

3.Throttle control motor relay is faulty.

P2100 Mercedes Fault Code Symptoms

Malfunction indicator lamp or engine check light ON.

How To Fix

Check for possible causes given above. Inspect wiring ,harness and connector of throttle control motor and throttle control motor relay. Repair or replace error detected parts.

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