Polo Mk3
Engine control unit
Adapting engine control unit to throttle valve control part
The adaption teaches the engine control unit the various positions of the throttle unit when the ignition is switched on and the engine is not running. These positions are stored in the control unit. The feedback of the throttle valve position is via both angle senders for throttle valve drive. Adapting sequence must be performed if:
Note: On vehicles fitted with an automatic gearbox the gearbox control unit must also be adapted: Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
Test conditions
Work sequence
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After pressing the Q key the throttle valve positioner is switched so that it is not supplied with voltage at start of test. In this condition the throttle valve is pulled into an emergency running position by a mechanical spring in the throttle valve control part. The values that both angle senders provide in the emergency running position are stored by the engine control unit. Thereafter the throttle valve is opened a predetermined value. If this value is achieved, the throttle valve is again switched so that it is not supplied with voltage. Now the mechanical spring must pull the throttle valve to the previously learnt emergency running position within a predetermined period (spring test). Then the throttle valve is closed by the throttle valve positioner and the values, which are supplied by the angle senders in the throttle valve control part are stored by the engine control unit. If the engine control unit switches the throttle valve positioner so that it is without voltage during normal operation, this is indicated by the increased and hunting idling speed. The engine reacts slowly to accelerator changes. |
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Indicated on display: (1...4 = display zones) |
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Adapting has been performed successfully. To store the values:
Note: If the basic setting of the control unit is interrupted, the cause could be one of the following:
After an interruption a fault is stored in fault memory. When next switching on ignition the basic setting is automatically performed again.
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