Test Mechanical engine triggering with pedal value transmitter (PWG, throttle lever signal) Flash code: 1x short Fault indication: Fault indicated by steady light at EDC indicator lamp Fault path: Pedal value transmitter (PWG, hand throttle signal) Signal too high Signal too low Signal implausible with idle speed switch (in pedal value transmitter) Effect of fault: Engine assumes lower idle speed Driving with idle speed switch: Hand throttle in idle speed position: idle speed Hand throttle in full-load position: slow increase in engine speed o approx. 1500–1700 rpm Possible cause:
Line break, short-circuit, power supply interrupted, Pedal value transmitter defective, control unit defective Test precondition: EDC control unit connected Socket box connected “Ignition” switched on 36 Test Measurement Corrective measures Power supply Measure voltage at socket box across pin 45 (+) and pin 13 (–) Setpoint: 4.75–5.25 V – Check lines – Check plug connections – If no fault found, replace control unit Potentiometer signal PWG Min. 0 % PWG Max. 100 % Measure voltage at socket box across pin 27 (+) and pin 13(–) Setpoints: Idle speed setting: 0.5–0.7 V Full load setting:
3.05–4.0 V – Check lines – Check plug connections – Check mechanical connec- tion between hand throttle and pedal value transmitter – Check idle-speed and full- load stops of the pedal value transmitters – Exchange pedal value transmitter