TR-Signal/EKP Relay

TR-signal/EKP Relay:

Check function:

4-pin relay up to model '89.

The EKP relay switches on for as long as the DME control unit outputs a ground signal with overlaid engine speed signal (one per crankshaft revolution) at Pin 3.

7-pin relay as of model year '89.

The EKP relay switches only during the start (via terminal 50) or when ignition signal (terminal 1) is applied.

Possible causes:

- Wire to EKP relay defective

- EKP relay or main relay defective

- Voltage supply for DME control unit, relay 1 or 2 not OK.

- No signals from engine speed/position pulse generator (sensor)

- Ignition output stage or ignition coil defective (only model '89)

- Fuel evaporation control valve