Test Time-lag relay (K3) Flash code: No Fault indication: Fault is not indicated by EDC indicator lamp Fault path: Relay does not work, emergency stop actuated Effect of fault: Engine does not start EDC control unit does not get any voltage Engine stops Function: Battery main switch: Green LED Ignition on Red LED Ignition off After 8 seconds LED changes from red to green Battery voltage U-Batt is connected up via the emergency stop relay A1–A2. When the control contact B1 closes the relay moves immediately to working position. The returning time (approx. 8 sec- onds) begins when the control contact B1 opens. When the emerg- ency stop circuit opens the relay drops out immediately.
Possible cause Ignition not present at control contact B1 Supply voltage not present at A1/A2 Relay does not close Test precondition: Ignition on, emergency stop relay closed 56 Test Measurement Corrective measures Supply voltage between Pin A1 (K3) and Pin A2 (K3) Setpoints: U-Batt If U-Batt is not present – Check battery main switch – Check emergency stop button Switching voltage between B1 (K3) and terminal 1 Setpoints: U-Batt If U-Batt is not present – Check starter lock Measure resistance between Pin 18 (K3) and terminal 1 Setpoints: 0 Ω If specified value is not avail- able – Change relay K3