P0A7F

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









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 based on the 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 a 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 a malfunction has occurred. When either of the malfunction detection conditions is met, the hybrid vehicle control ECU illuminates the MIL and sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the power switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4. Turn the power switch off.

5. Turn the power switch on (READY) and turn the Techstream on.

6. Wait for 30 seconds or more.

7. Drive the vehicle on urban roads at a speed of 40 km/h (25 mph) or more for a total of at least 10 minutes. [A]

NOTICE:
Avoid abrupt acceleration or braking.

8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

9. Check that permanent DTCs are cleared.

10. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTCS (DTC P0A1F-123 OR P0AFC-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 OR P0AFC-123) Hybrid Battery System
A -- Continue to next step.

2. CHECK BATTERY SMART UNIT

(a) Make sure the areas in front and at the back of the vehicle are safe.

(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 the difference between each pair of battery block voltages.

Result





HINT
- When an internal malfunction occurs in the battery smart unit, this symptom (difference in voltage of 0.3 V or more for all 10 pairs of blocks) will occur.
- Refer to the wiring diagram for DTC P0A80-123 P0A80.





B -- REPLACE HV BATTERY Removal

A -- REPLACE BATTERY SMART UNIT Removal