Patent ID: 7779678

Claim:
A method for monitoring an injection device for an internal combustion engine, comprising the following steps: monitoring by a misfire detection of a cylinder of the internal combustion engine for misfiring; detecting at least one of a mechanical malfunction and an electrical malfunction of an injection device by evaluating signals of the misfire detection; detecting different types of errors based on a number of cylinders in which a misfire has occurred; implementing as a response one of a check for electrical faults of an output stage and a limp-home mode depending on the malfunction that was detected; detecting a mechanical malfunction of the injection device when a misfiring cylinder is detected and the fuel pressure has dropped below a threshold value; and detecting an electrical malfunction of the injection device if cylinders ( 110 ) assigned to an output stage of the injection device ( 5 ) misfire, and the fuel pressure drops below a threshold value (SW).