P0A7F

HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A7F-123: Hybrid Battery Pack Deterioration

DTC P0A7F-123 - Hybrid Battery Pack Deterioration

DESCRIPTION

The battery smart unit sends information about the condition of the HV battery to the hybrid vehicle control ECU. The hybrid vehicle control ECU then calculates the SOC (state of charge) based on this information and controls HV battery charge and discharge according to the driving condition.









HINT: This DTC cannot be set unless the vehicle is driven for approximately 10 minutes after clearing the DTCs. Two trip detection logic is used. After the first road test, turn the power switch off and perform a road test again.

MONITOR DESCRIPTION

The battery smart unit calculates the resistance of the HV battery through amperage and voltage, and uses this resistance to determine the extent of deterioration of the HV battery. If the battery smart unit detects that the resistance of the HV battery has exceeded the standard, it determines that malfunction has occurred. In addition, the battery smart unit monitors the SOC, and if the difference between the maximum and minimum SOC values exceeds the standard, it determines that malfunction has occurred. When either of the malfunction detection conditions is met, the hybrid vehicle control ECU illuminates the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTCS (DTC P0A1F-123 IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Result:






B -- GO TO DTC CHART (P0A1F-123)
A -- Continue to next step.
2. CHECK BATTERY SMART UNIT (VB1 - 20)
(a) Ensure the safety of the areas in front and at the back of the vehicle.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (READY).
(d) Select the following menu items: Powertrain / Hybrid Control / Data List / Battery Block Vol - V01 to V20.
(e) Fully warm up the engine and turn the air conditioning off.
(f) Firmly depress the brake pedal with your left foot.
(g) Move the shift lever to the D position.
(h) Record each battery block voltage in the data list ("Battery Block Vol - V01 to V20") while fully depressing the accelerator pedal.
(i) Compare the battery block voltages ("Battery Block Vol - V01 to V20") between the even and odd number groups in each combination shown in the table below.





(j) Check if the difference in voltage of each combination is 0.3 V or more.
Result:





HINT:
- Difference in voltage of each combination may be 0.3 V or more due to a battery smart unit internal error.

B -- REPLACE BATTERY SMART UNIT
A -- REPLACE HV BATTERY