DTC P06A8: General Description
The main CPU supplies 3.3 V power voltage to the sub CPU. The sub CPU converts (A/D conversion) the supplied power voltage and outputs the A/D converted value to the main CPU via serial communication. The main CPU monitors the PCM internal 5 V power supply by using the received value (comparison power supply voltage (3.3 V under a normal condition)) from the sub CPU. When the 5 V power supply is normal, the comparison power supply voltage (3.3 V) is supposed to be within a normal area. If the 5 V power supply does not work properly, the comparison power supply voltage (3.3 V) exceeds the range of the normal area. If the comparison power supply voltage is out of the permissible range for a set time, the PCM detects a malfunction and stores a DTC.