DIAGNOSTIC FUNCTION



HOW TO READ DIAGNOSIS CODE


Refer to GROUP 00 - Diagnostic Function .

HOW TO ERASE DIAGNOSIS CODE


Refer to GROUP 00 - Diagnostic Function .

FAIL-SAFE FUNCTION



FAILURE DETECTION


4WD-ECU performs the following checks at a timing shown in the chart below. 4WD-ECU determines the malfunction occurred when the failure detection conditions are met, and it sets the diagnosis code and executes the countermeasures for trouble. When the failure resume conditions are met, ECU determines the status is normal, and resumes the system.
Start-up (Initial check just after the ignition switch is turned ON.)
  1. CPU check

  • Actuator check

  • Always (During ignition ON status other than initial check operation)
    1. CPU check

  • Power supply check

  • Actuator check

  • External wire connection check