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© 200438 1-9 UPEC fault codes UPEC DAVIE XD diagnostics manual 2 51-8 Conflict between position of idling switch and short circuit to supply on pin B16 of the ECU - short circuit between pin B17 and pin B25 of - short circuit to earth on pin B17 of the ECU - moisture in connector connection - No response to accelerator pedal - Engine runs at increased idling speed Conflict between position of idling switch and interruption on pin B17 and/or pin B25 of the - When the accelerator pedal is depressed 52-8 After the ignition had been switched on, the brake - No noticeable system limitation 53-1 Short circuit to supply of vehicle speed signal of - Cruise control cannot be activated - Variable vehicle speed limitation function - Engine brake can be activated with the - Control function for engine speed control 53-2 Short circuit to earth of vehicle speed signal of - Cruise control cannot be activated - Variable vehicle speed limitation function - Engine brake can be activated with the - Control function for engine speed control 53-8 Unacceptable vehicle speed signal of MTCO interruption on pin B29 - excessive vehicle speed for example due to - loose pulse ring in gearbox - Cruise control cannot be activated - Variable vehicle speed limitation function - Engine brake can be activated with the - Control function for engine speed control 54-1 Too high a voltage on the atmospheric pressure internal fault in ECU - No noticeable system limitation in UPEC 54-2 Too low a voltage on the atmospheric pressure internal fault in ECU - No noticeable system limitation in UPEC 54-4 Internal ECU fault relating to the atmospheric - No noticeable system limitation in UPEC 55-8 Frequency of speed signal of electronically mechanically blocked fan clutch - No noticeable system limitation in UPEC Fault code Fault code description with possible cause Symptom |