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Home >> Subaru >> 2023 >> Ascent Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (3 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1C00: Battery Monitor Module "A" Performance >> General Description >> Diagnostic Method
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Diagnostic Method

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 1)

Malfunction Criteria Threshold Value
Receives the battery sensor information "pulse discharge malfunction" ON
Or,
Receives the battery sensor information "voltage measurement malfunction"
ON
Or,
Receives the battery sensor information "current measurement malfunction"
ON
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 2)

Malfunction Criteria Threshold Value
Battery current Less than -1000 A or more than 300 A
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 3)

Malfunction Criteria Threshold Value
Battery voltage Less than 6 V or more than 16.2 V
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 4)

Malfunction Criteria Threshold Value
Battery temperature More than 105°C (221°F)
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 5)

Malfunction Criteria Threshold Value
Battery SOC More than 100%
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 6)

Malfunction Criteria Threshold Value
|Battery current (current value) - Battery current (previous value)| 0.003 A or less

Time needed for diagnosis 

Diagnosis 1:  Less than 1 s

Diagnosis 2, 3, 4 and 5:  10 s

Diagnosis 6:  60 s

Malfunction indicator light illumination:  Does not illuminate.