HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P300000; Hybrid/EV Battery Discharge Control Malfunction; 2019 - 2020 MY Avalon HV [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001A0E4
Model Year Start: 2019	Model: Avalon HV	Prod Date Range: [04/2018 - 08/2020]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P300000; Hybrid/EV Battery Discharge Control Malfunction; 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]

DTC

P300000

Hybrid/EV Battery Discharge Control Malfunction

DESCRIPTION

The hybrid vehicle control ECU alerts the driver and performs fail-safe control based on error signals received from the battery voltage sensor. This DTC is stored when the SOC (state of charge) of the HV battery has dropped excessively as a result of leaving shift lever in N, running out of fuel, or a malfunction in the hybrid system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P300000

Hybrid/EV Battery Discharge Control Malfunction

Discharging prohibited

Discharging of the HV battery continues even after discharging is prohibited when the hybrid system is malfunctioning and "Hybrid Battery SOC" has reached the lower limit.

(1 trip detection logic)

SFI system
Fuel level
HV battery

Does not come on

Master Warning Light:

Does not come on

Related Data List

DTC No.	Data List
P300000	Hybrid Battery SOC WOUT Control Limit Power Hybrid Battery Current

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
Turn the power switch on (READY) with shift lever in P and cause the "Hybrid Battery SOC" to decrease. Check that the engine is started to charge the HV battery, and the value of Data List item "Hybrid Battery SOC" increases and then remains within an appropriate range.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

CAUTION / NOTICE / HINT

HINT:

If the vehicle is left with shift lever in N (parked or stopped) for a long time, the battery cannot be charged. In this case, the SOC may drop below the lower limit and DTC P300000 may be stored. (This is not a system malfunction.)
When the engine cannot be started, DTC P300000 may be stored because the HV battery cannot be charged.
Repeated engine start checks may cause the SOC to drop, resulting in DTC P300000 being stored. In this case, charge the HV battery using the THS charger.
Cranking the engine once causes the SOC to drop approximately 1%.
Charging the HV battery once (10 minutes) using the THS charger restores the SOC approximately 2%.
Charging the HV battery using the THS charger takes approximately 10 minutes when the battery temperature is 25°C (77°F) or approximately 30 minutes when the battery temperature is 0°C (32°F).
The THS charger is a supplemental charging device that enables the hybrid system to start (READY-on state).
If the result of this inspection is to charge the HV battery, clear the DTCs and then charge the HV battery using the THS charger.

PROCEDURE

1.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P300000 or P300016 only is output.	A
DTCs other than P300000 and P300016 are also output.	B

(e) Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

2.	CHECK DTC OUTPUT (ENGINE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(d) Check for DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
No DTCs are output.	A
DTCs are output.	B

(e) Turn the power switch off.

GO TO DTC CHART (SFI SYSTEM)

3.	CHECK AMOUNT OF FUEL

(a) Turn the power switch on (IG).

(b) Check the amount of fuel by referring to the fuel gauge in the meter.

HINT:

Add fuel until the low fuel level warning light turns off.

Result	Proceed to
Proper amount of fuel is in the tank.	A
There is no fuel in the tank.	B

REFUEL VEHICLE

4.	CHECK FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(d) Read the freeze frame data item "Shift Position" of DTC P300000.

Powertrain > Hybrid Control > Trouble Codes

Powertrain > Hybrid Control

Tester Display
Shift Position

NOTICE:

When the freeze frame data "Shift Position" was N, DTC P300000 may be stored due to the vehicle was left with shift lever in N and the HV battery could not be charged.
If DTC "P300000" only is output, charge the HV battery without replacing the HV battery if necessary.

(e) Turn the power switch off.

5.	CHECK ENGINE START

(a) Turn the power switch on (READY).

(b) Check if the engine starts.

HINT:

Depressing the accelerator pedal with shift lever in P will cause the engine to start.
Turning the power switch on (READY) and off repeatedly while the SOC is low may cause the SOC to drop further, resulting in DTC P300016 being stored. Charge the HV battery using the THS charger as necessary.
Cranking the engine once causes the SOC to drop approximately 1%.
Charging the HV battery once (10 minutes) using the THS charger restores the SOC approximately 2%.

Result	Proceed to
The engine starts.	A
The engine does not start.	B

LEAVE VEHICLE WITH SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS

CLEAR DTC

Click here

CHARGE HV BATTERY (CHECK THAT ENGINE STARTS)