TR-Signal/EKP Relay

TR-signal/EKP Relay:

Check function:

The EKP relay switches on as soon as the DME control unit outputs at Pin 1 a ground signal with overlaid engine speed signal (once per crankshaft revolution).

In addition, at ignition ON, the EKP relay is briefly activated by the DME in order to build up the necessary fuel pressure before starting. The voltage increase can be measured at fuse F23.

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)