System Components: Input

Starting with production 6/94, the DME "TD" (engine speed) signal was added to the inputs of the Starter Immobilization Relay. This additional input allows the relay to provide a starter protection feature. The internal relay contact (starter operation) opens if the TD signal exceeds 60 Hz which equals the following engine speeds:

• 4 cylinder = 1800 RPM.
• 6 or 12 cylinder = 1200 RPM.
• 8 cylinder = 900 RPM.

The relay contacts will close when the exceeded Hz value drops to 5Hz below the maximum value. This is intended as a safety feature to prevent starter motor activation when the engine is running above these speeds.