DTC P058A-01: Auxiliary Battery Monitor Module Range/Performance [06/2018 - ]: Description

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The battery state sensor assembly detects the auxiliary voltage, current and temperature of the auxiliary battery. The battery state sensor assembly calculates State of Charge (SOC) based on the voltage and current of the auxiliary battery and sends it to the hybrid vehicle control ECU. Based on the signals received, the hybrid vehicle control ECU adjusts the charging voltage of the DC/DC converter.

The battery state sensor assembly calculates the auxiliary battery temperature based on changes in resistance of a built-in thermistor and sends it to the hybrid vehicle control ECU. The hybrid vehicle control ECU reduces the amount of charging current based on this signal in order to protect the auxiliary battery.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory
P058A01	Auxiliary Battery Monitor Module Range/Performance	Any of the following conditions is met with the power switch on (IG). (1 trip detection logic): Current is 999.939 A or more, or -1000 A or less for 3.2 seconds or more. The difference between the maximum and minimum current is 0.0305 A or less for 100 seconds or more. A current detection circuit malfunction signal is received. The auxiliary battery temperature is 105°C (221°F) or more, or -40°C (-40°F) or less for 3.2 seconds or more. A temperature detection circuit malfunction signal is received. Voltage is 15.98 V or more, or 6.0 V or less for 3.2 seconds or more. A voltage detection circuit malfunction signal is received. A writing error occurs in the auxiliary battery state sensor internal memory (battery identification data).	Battery state sensor assembly Auxiliary battery Wire harness or connector	Charge warning is not displayed	DTC stored