Untitled

Test
Drive stage selection
Flash code:
Fault indication:
Fault path:
Effect of fault:
Possible cause:
Test precondition:
1x short
Fault is indicated by the EDC indicator lamp coming on continuously
Drive stage selection
– Signal too high
– Signal too low
– Signal implausible with idle speed switch
Engine assumes lower idle speed
Line break, short-circuit, power supply interrupted, drive stage selection defective,
control unit defective
Socket box connected
“Ignition” switched on
Test Measurement Corrective measures
Voltage supply Measure voltage at the socket box across – Check lines
pin 45 (+) and pin 13 (–)
– Check plug connections
Setpoint: 4.75–5.25 V
– If no fault found, replace control
unit (disconnect the control unit
only when the current is
switched off)
Drive stage selection
PWG Min. 0 %
PWG Max. 100 %
Idle speed switch
Measure voltage at the socket box across
pin 27 (+) and pin 13 (–)
Setpoints:
Idle speed setting: 0.3–0.5 V
Full load setting: 2.9–3.1 V
Measure voltage on the socket box across
pin 39 (+) and pin 13 (–)
– Check lines
– Check plug connections
– Replace drive stage selection
– Check lines
– Check plug connections
PWG Min. 0 %
PWG Max. 100 %
Setpoints:
Idle speed setting: 4.75–5.25 V
Full load setting: 0.0–2.0 V
Switch open
Switch closed
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