Test EDC operating element for idle speed setting Flash code: 1x long, 13x short Fault indication: Fault is not indicated by EDC indicator lamp Fault path: EDC control box (idle speed adjustment function) defective Voltage values incorrect or implausible Effect of fault: Idle speed control can no longer be activated. If the fault was only temporary (e.g. operating unit activated several times) the system will be ready for operation after switching the “ignition” off an on again. Function: The operating unit is resistor-coded, i.e. the control unit recognizes each switching state according to the voltage level supplied.
Faults are detected when incorrect values are output over a certain period of time; e.g. electrical fault or multiple operation (incorrect oper- ation) of the operating unit Possible cause Line break, short-circuit, operating unit defective, incorrect oper- ation Test precondition: EDC control unit connected Socket box connected “Ignition” switched on 53 Test Measurement Corrective measures Operating unit Measure voltage at socket box across pin 44 and pin 13 Switch through all settings of the operating unit and determine rel- evant voltage value Setpoints: SET+: 0.65–0.97 V SET–: 2.31–2.75 V MEMORY: 1.41–1.81 V OFF: 3.72–4.33 V Not activated:
3.15–3.55 V – Check lines – Check plug connections – Exchange EDC operating element – If no fault found, replace control unit as a check