On-Board Diagnosis System
The on-board diagnosis system detects a trouble and generates/displays a code corresponding to the trouble point. The AT OIL TEMP light on the combination meter flashes to indicate the occurrence of a trouble or malfunction.
The AT OIL TEMP light flashes as the result of trouble detection by the control module, and the diagnostic trouble code (DTC) corresponding to that trouble is stored in the control module.
Before checking a DTC, you must connect the Subaru Select Monitor III (SSM III) to the data link connector. To facilitate various functions and diagnosis operations, a SSM III-ready diagnosis system is adopted.
The on-board diagnosis system detects troubles in the electric system or abnormal system conditions as listed below.
| Lockup duty solenoid | AWD duty solenoid |
| Lockup ON/OFF solenoid | ATF oil temperature sensor |
| Primary speed sensor | Inhibitor switch |
| Secondary speed sensor | Manual switch |
| Front wheel speed sensor | Speed change control function |
| Secondary hydraulic pressure sensor | High-speed CAN communication |
| Secondary linear solenoid | Self-shut relay |
| F&R clutch linear solenoid | Brake switch |
| Primary UP duty solenoid | AT shift lock solenoid |
| Primary DOWN duty solenoid | - |