Description of on-Board Diagnostics

AIR CONDITIONER SYSTEM ON-BOARD DIAGNOSIS

On-board Diagnostic (OBD) Test Description
- The on-board diagnostic function in the A/C amplifier locates and indicates malfunctions in the control system.
- The on-board diagnostic function has three steps.
Present diagnostic test mode - Electrical faults presently occuring in the control system are detected and indicated as diagnostic trouble codes.
Past diagnostic test mode - Electrical faults that previously occurred in the control system (intermittent problems) are detected and indicated as diagnostic trouble codes.
Output device operation check mode - All output devices are made to operate individually according to a designated pattern.
- The on-board diagnostic function works as shown. To turn off the on-board diagnostic function, turn off the ignition switch.




Operation flow