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© 1-11 UPEC fault codes UPEC DAVIE XD diagnostics manual 2 56-5 Irregular engine running detected by the ECU due fuel leak of injector pipes of cylinders 1 and 3 - defective/clogged injectors of cylinders 1 - air in fuel system - internal leakage of pump units of cylinders 1 - clogged injector pipes of cylinders 1 and 3 - too low a combustion pressure in cylinders 1 - Irregular engine running and reduced 56-6 Irregular engine running detected by the ECU due fuel leak of injector pipes of cylinders 3 and 5 - defective/clogged injectors of cylinders 3 - air in fuel system - internal leakage of pump units of cylinders 3 - clogged injector pipes of cylinders 3 and 5 - too low a combustion pressure in cylinders 3 - Irregular engine running and reduced 56-7 Irregular engine running detected by the ECU due fuel leak of injector pipes of cylinders 1, 3 - defective/clogged injectors of cylinders 1, 3 - air in fuel system - internal leakage of pump units of cylinders 1, - clogged injector pipes of cylinders 1, 3 and 5 - too low a combustion pressure in cylinders - Irregular engine running and reduced 56-8 Irregular engine running detected by the ECU due fuel leak of injector pipe of cylinder 6 - defective/clogged injector of cylinder 6 - air in fuel system - internal leakage of pump unit of cylinder 6 - clogged injector pipe of cylinder 6 - too low a combustion pressure in cylinder 6 - Irregular engine running and reduced Fault code Fault code description with possible cause Symptom |