Test Relay (K2) Flash code: No Fault indication: Fault is not indicated by EDC indicator lamp Fault path: Emergency stop actuation, relay K3 defective, relay K2 defective Effect of fault: Engine does not start or switches itself off Function: Switch-on of ignition signal at Pin 47 for the EDC control unit Negative switch for EHAB K2 picks up if the LED at K3 is red. % LED at K2 is green. Possible cause Supply voltage U–Batt is not present at A1/A2. Relay does not close Test precondition: Ignition on, emergency stop relay closed 55 Test Measurement Corrective measures Supply voltage between Pin A1 and Pin A2 Setpoints:
U-Batt If U-Batt is not present – Check relay K3 Switching voltage from terminal 15 between Pin 11 (K2) and terminal 1 Pin 14 (K2) and terminal 1 Setpoints: U-Batt If U-Batt is not present be- tween Pin 14 (K2) and ter- minal 1 but is present be- tween Pin 11 (K2) and ter- minal 1 – Change relay K2 Switching resistance Measure resistance between ter- minal 1 and Pin 21 (K2) Setpoints: 0 Ω If resistance is not 0 Ω – Change relay K2 Switching resistance Measure resistance between ter- minal 1 and Pin 24 (K2) Setpoints: 0 Ω If resistance is not 0 Ω – Change relay K2