Lexus ES: Hybrid/EV Battery State of Charge High (P0C3000)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System (for Lithium-ion Battery) / Hybrid/EV Battery State of Charge High (P0C3000)

DESCRIPTION

The battery ECU assembly monitors the operation of the hybrid battery system and will store this DTC if it detects a malfunction.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0C3000	Hybrid/EV Battery State of Charge High	Even though charging of the HV battery is prohibited due to the SOC reaching the upper limit, charging continues to be performed due to a hybrid control system malfunction. (1 trip detection logic)	Hybrid vehicle control ECU HV battery junction block assembly	Does not come on	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0C3000

Hybrid/EV Battery State of Charge High

Even though charging of the HV battery is prohibited due to the SOC reaching the upper limit, charging continues to be performed due to a hybrid control system malfunction.

(1 trip detection logic)

Hybrid vehicle control ECU
HV battery junction block assembly

Does not come on

Master Warning Light:

Comes on

Related Data List

DTC No.	Data List
P0C3000	Hybrid/EV Battery SOC WIN Control Limit Power Hybrid/EV Battery Current

CONFIRMATION DRIVING PATTERN

HINT:

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

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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.
Apply the parking brake and secure the wheels using chocks.
Turn the power switch on (READY), move the shift lever to D and the vehicle stopped, firmly depress the brake pedal and accelerator pedal. The engine rpm will increase as well as the value of Data List item "Hybrid/EV Battery SOC". If the value drops, release the accelerator pedal and then depress it again to continue charging.
Check that charging stops when the Data List item "Hybrid/EV Battery SOC" reaches the upper limit.
Enter the following menus: Powertrain / HV battery / 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.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AA649.

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CAUTION / NOTICE / HINT

CAUTION:

Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

*a

Without waiting for 10 minutes

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HINT:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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PROCEDURE

1.	CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

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

(d) Check for DTCs.

Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
"P0C3000" only is output.	A
DTCs except "P0C3000" of hybrid battery system are output.	B
DTCs except "P0C3000" of hybrid control system are output.	C

(e) Turn the power switch off.

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

2.	CHECK FREEZE FRAME DATA (HV BATTERY)

(a) Connect the Techstream to the DLC3.

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

(d) Read the freeze frame data of DTC P0C3000.

Powertrain > HV Battery > Trouble Codes

Result	Proceed to
OFF is displayed for "Ready Signal", "SMRP Control Status", "SMRB Control Status" and "SMRG Control Status" and -0.5 A or less is displayed for "Hybrid/EV Battery Current".	A
Other than above	B

HINT:

As the power switch on (IG) state may cause the DTC to be stored, freeze frame data is used to judge the cause of the DTC output.

(e) Turn the power switch off.

REPLACE HYBRID VEHICLE CONTROL ECU

3.	INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRP, SMRB, SMRG)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (IG), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

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NOTICE:

Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.

(d) Measure the resistance according to the value(s) in the table below.

Component without harness connected

(HV Battery Junction Block Assembly)

Standard Resistance (SMRB):

Tester Connection	Condition	Specified Condition
a2-1 (CBI) - y18-1 (+)	Power switch off	10 kΩ or higher

(e) Measure the resistance according to the value(s) in the table below.

Component without harness connected

(HV Battery Junction Block Assembly)

Standard Resistance (SMRG, SMRP):

Tester Connection	Condition	Specified Condition
a3-1 (CEI) - y12-1 (-)	Power switch off	10 kΩ or higher

(f) Reconnect the high voltage cable connectors to the HV battery junction block assembly.

(g) Install the No. 1 HV battery cover panel RH.

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

4.	PERFORM INITIALIZATION (CURRENT SENSOR OFFSET LEARNING)

(a) Connect the Techstream to the DLC3.

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

NOTICE:

Accelerate/decelerate gently. Avoid rapid acceleration/deceleration.

(d) Enter the following menus: Powertrain / HV Battery / Data List / Hybrid/EV Battery Current

(e) Drive the vehicle with the value of Data List item "Hybrid/EV Battery Current" between -50 A to 50 A.

Powertrain > HV Battery > Data List

Tester Display
Hybrid/EV Battery Current

HINT:

Distance and driving time are not specified.

(f) Turn the power switch off and leave the vehicle for 30 seconds or more.

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

(h) Enter the following menus: Powertrain / HV Battery / Data List / Hybrid/EV Battery Current

(i) Check that the value of "Hybrid/EV Battery Current" is between - 0.5 A and 0.5 A with the power switch on (IG).

Powertrain > HV Battery > Data List

Tester Display
Hybrid/EV Battery Current

NOTICE:

If the value is outside the specified range, perform the road test again.
This DTC may be output if Current Sensor Offset Learning has not been completed.

HINT:

If the power switch is on (IG) and value of "Hybrid/EV Battery Current" is between - 0.5 A and 0.5 A, current sensor offset learning has been completed.
Even if the current sensor offset learning is not complete, the current sensor value will be corrected by repeating the road test a maximum of 7 times.

(j) Turn the power switch off.

END

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