Test brake light switch -F- and brake pedal switch -F47- |
As the injection system operates with an accelerator pedal position sender (potentiometer), which may become defective, for reasons of safety the engine is cut-off when the brake is activated. To do so the brake light switch signal and additionally the brake pedal swicth signal in the engine control unit -J248- is required. |
If the brake pedal is activated simultaneously with the accelerator pedal pressed, the engine immediately slows down to idling speed. A defective brake pedal switch may result in involuntary cut-off procedures. |
Special tools and workshop equipment required |
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| Vehicle system tester -V.A.G 1552- |
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| Diagnostic cable -V.A.G 1551/3- or -V.A.G 1551/3A- or -V.A.G 1551/3B- |
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| Hand multimeter (e.g. -V.A.G 1526 A-) |
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| Adapter cable set (e.g. -V.A.G 1594 A-) |
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| Test box -V.A.G 1598/31- |
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| Fuses no. 13 and no. 43 o.k. |
Check for proper operation |
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| Connect vehicle system tester -V.A.G 1552-. Switch ignition on and then select “address word” 01 Engine electronics → Chapter. |
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| Select function 08 “read measured value block” and display group number 006. |
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