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Workshop Manuals

Throttle Position Sensor|Testing and Inspection|Page 3057

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Page 3 Function Monitoring Besides the functions which control the engine operation, the Electronic Control Unit contains extensive monitoring functions which guarantee a fail-safe vehicle operation in case of a fault. These functions cover two errors: - Error detected in function monitoring (and not in the main function) which causes safety fuel cut-off. Safety fuel cut-off means that the throttle blade is switched currentless and injection is cut-off long enough so that the engine speed decreases to a permitted non-critical value. - Error in torque comparison which le ads to safety fuel cut-off. This error is set when it is recognized that the actual torque of the engine exceeds the requested torque. Function Monitoring

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