Testing Drive stage selection Flash code: 1x short Fault indication: Fault is indicated by the EDC indicator lamp coming on continuously Fault path: Drive stage selection Signal too high Signal too low Signal implausible with idle speed switch Effect of fault: Engine assumes lower idle speed Possible cause: Line break, short-circuit, power supply interrupted, pedal travel sensor faulty, control unit faulty Test precondition: Socket box connected Ignition switched on 30 Test Measurement Corrective measures Power supply Measure voltage at the socket box across pin 45 (+) and pin 13 (–) Set-point value:
4,75–5,25 V – Check lines – Check plug connections – If no fault found, replace control unit (disconnect the control unit only when the current is swit- ched off) Drive stage selection PWG Min. 0 % PWG Max. 100 % Measure voltage at socket box across pin 27 (+) and pin 13 (–) Set-point value: Idle speed setting: 0,3–0,5 V Full load setting: 2,9–4,5 V – Check lines – Check plug connections – Replace drive stage selection Idle speed switch PWG Min. 0 % PWG Max. 100 % Measure voltage at socket box across pin 39 (+) and pin 13 (–) Set-point value: Idle speed setting: 4,75–5,25 V Full load setting: 0,0–2,0 V – Check lines – Check plug connections Switch open Switch closed