Test Electrical engine triggering with 4–20 mA throttle lever signal Flash code: 1x short Fault indication: Fault indicated by steady light at EDC indicator lamp Fault path: 4–20 mA throttle lever signal Signal too high Signal too low Signal implausible No idle switch signal Control box defective Effect of fault: Engine assumes lower idle speed Possible cause: Cable interrupted, control box defective, failure of voltage supply at control box, throttle lever control system defective, control unit defective Test precondition:
EDC control unit connected “Ignition” switched on Throttle lever control system connected up and switched on 38 Test Measurement Corrective measures Control box Control box voltage supply be- tween terminal 1 and terminal 2 Setpoint: U-Batt – Check lines – Check control box – Check plug Throttle lever signal Throttle lever posi- tion Min. 0 % Max. 100 % Measure voltage at socket box across pin 27 (+) and pin 13 (–) alternative: Measure voltage at control box across terminal 10 and terminal 16 Setpoints: Idle speed setting: [0.64 V Full load setting:
[3.2 V – Check lines – Check plug connections – Check wire jumpers at Pins 11/13, 12/14 in plug X9 – Check throttle lever control system – Fit new control box