Electronic Control Units
CAUTION:
When performing PRELIMINARY CHECKS
, be careful not to erase any diagnostic information stored in the ECU memory. See MEMORY ERASE
for procedures to avoid.
Modes 1 and 2 are used for monitoring LED inspection lights which flash in accordance to the air/fuel mixture ratio. Mode 3 is used for obtaining trouble codes for component or circuit failures. Mode 4 is used to determine if malfunction(s) are present in the on/off controlled switches of the system. Mode 5 is used for monitoring the system and its components during actual driving conditions, usually to simulate an intermittent condition.