Diagnostic Trouble Code Tests and Associated Procedures

NOTE: DTC P0622 may be set by the loss of the communication lines between the generator and the PCM. The charging system warning indicator then illuminates until the engine is operated at greater than 4,500 rpm (approximately wide open throttle [WOT]) for a minimum of 3 seconds. At this time, the generator self-excites. The charging system warning indicator remains illuminated and the generator operates in a default mode (approximately 13.5 volts) until the engine is turned off.