Malfunction Threshold

One of these conditions must be met for at least 0.5 second:

• No sub CPU monitor signals are detected.
• Sub CPU monitor signals are abnormal.

One of these occurs:

• The internal communication between the FI CPU and the A/T CPU is abnormal or the internal communication is interrupted for at least 200 milliseconds.
• The watchdog timer that monitors the A/T CPU detects an abnormality, and the FI CPU receives the A/T CPU check signal.