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‒ Check specified values for electronic throttle potentiometer voltages.
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Display zones
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1
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2
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3
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4
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Display group 62: Electronic throttle potentiometer voltages
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Display
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xx %
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xx %
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xx %
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xx %
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Display
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Throttle valve angle (angle sender 1)
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Throttle valve angle (angle sender 2)
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Sender for accelerator pedal position
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Sender 2 for accelerator pedal position
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Range
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min.: 0 % max.: 100 %
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min.: 0 % max.: 100 %
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min.: 0 % max.: 100 %
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min.: 0 % max.: 100 %
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Specified values
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3...93 % (Idling speed value: 8...18 %)
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97...3 % (Idling speed value: 80...90 %)
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12...97 %
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4...49 %
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Note:
The engine control unit converts and displays the voltage readings from the angle senders as percentages of 5 V. (A 5 Volt supply corresponds to 100%).
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‒ Observe readouts in display zones 1 and 2.
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‒ Slowly depress accelerator pedal.
Percentage displayed in zone 1 should rise evenly. The tolerance range from 3...93 % is not fully utilised.
Percentage displayed in zone 2 should fall evenly. The tolerance range from 97...3 % is not fully utilised.
If the displays are not as described:
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‒ Check throttle valve control unit voltage supply and wiring .
Pay particular attention to connectors, which may be loose, not properly engaged or corroded.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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‒ Check the accelerator position senders
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Notes:
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◆ The reason why the value in display zone 1 rises and that in zone 2 falls is that the potentiometers (angle senders) in the throttle valve control unit operate in opposite directions.
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◆ This means that the voltage picked off by one of the angle senders runs in the direction of 5 V. (As the throttle is opened, the voltage becomes greater and the percentage increases).
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◆ The voltage picked off by the angle sender 2 runs from 5 V in the direction of 0 V. (As the throttle is opened, the voltage becomes smaller and the percentage decreases).
Checking the voltage supply to the throttle valve control unit.
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