Remedy: 1. Turn the main switch off and on. 2. Reinstall the controller and/or engine main firmware. • See Note 1 at the end of the SC table.
Code: 991
Description: Software continuity error The software has attempted to perform an unexpected operation. However, unlike SC 990, the object of the error is continuity of the software.
Causes: • Software program error • Internal parameter incorrect, insufficient working memory.
Remedy: This SC is not displayed on the LCD (logging only).
Code: 992
Description: Undefined error Defective software program
Causes: • An error undetectable by any other SC code occurred
Remedy: Print the "Logging Data" with SP5990-004 and then check the SP7990. If 498-Engine is found in the SP7990; 1. Check the harness connection of the temperature/humidity sensor. 2. Replace the temperature/humidity sensor.