Lexus ES: Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System (for Lithium-ion Battery) / Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU detects a VB sensor malfunction.

The cause of this malfunction may be one of the following:

Battery ECU assembly VB sensor internal circuit malfunction

Battery ECU assembly malfunction
Communication (wire harness) malfunction

High voltage system malfunction

HV battery malfunction

DESCRIPTION

The battery ECU assembly sends HV battery voltage information to the hybrid vehicle control ECU via serial communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0B231C	Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range	Battery ECU assembly malfunction: When not boosting, difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is large and difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is large. (1 trip detection logic)	Battery ECU assembly	Comes on	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0B231C

Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range

Battery ECU assembly malfunction:

When not boosting, difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is large and difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is large.

(1 trip detection logic)

Battery ECU assembly

Comes on

Master Warning Light:

Comes on

Related Data List

DTC No.	Data List
P0B231C	Hybrid/EV Battery Voltage VL-Voltage before Boosting VH-Voltage after Boosting Boost Ratio

MONITOR DESCRIPTION

The hybrid vehicle control ECU calculates the differences between the received HV battery voltage, boost converter voltage, and inverter voltage. If the differences exceed prescribed values, the hybrid vehicle control ECU determines that there is a malfunction in the battery ECU assembly circuit. If the hybrid vehicle control ECU detects this malfunction, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0B23 (INF P0B231C): Hybrid/EV Battery "A" Voltage
Required sensors/components	Battery ECU assembly
Frequency of operation	-
Duration	-
MIL operation	1 driving cycle
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P0B23 (INF P0B231C) is not detected

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
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" 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). [*1]
With the shift lever in D, depress both the accelerator pedal and brake pedal at the same time to raise the "Hybrid/EV Battery SOC" to a sufficient level. [*2]
Move the shift lever to P, check that the engine is stopped and move the shift lever to N. [*3]
Set the A/C for maximum cooling. [*4]
Leave the vehicle for a few minutes. [*5]
HINT:
- After the repair if "VL-Voltage before Boosting" and the "Hybrid/EV Battery Voltage" are approximately the same when the power switch is turned on (READY) with shift lever in P and the accelerator pedal not depressed, the condition is judged as normal.
- [*1] to [*5] : Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
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 the normal judgment procedure again.

CAUTION / NOTICE / HINT

NOTICE:

Performing the check procedures for a long time with shift lever in N may cause DTC P300000 to be set.

HINT:

If the battery ECU assembly has been replaced, it is necessary to confirm the voltage of each battery block. With power switch on (READY), shift lever in P, the engine stopped and the HV battery voltage at 208 V or more, check the value of Data List items "Hybrid/EV Battery Voltage", "VL-Voltage before Boosting" and "VH-Voltage after Boosting". When the system is normal, the values of "Hybrid/EV Battery Voltage", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" should be almost equal. If the difference between each value is more than the voltages specified below, the system is malfunctioning.

Inspection Voltage	Maximum Voltage Difference
Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting"	39 V
Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting"	60 V
Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting"	76 V

PROCEDURE

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

(a) Connect the Techstream to the DLC3.

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

(d) Check for DTCs.

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

Result	Proceed to
P0B231C only is output, or DTCs except the ones in the table below are also output.	A
DTCs of hybrid control system in the tables below are output.	B
DTCs of motor generator control system in the tables below are output.	C
DTCs of hybrid battery system in the tables below are output.	D

Malfunction Content	System	Relevant DTC
Microcomputer malfunction	Hybrid control system	P0A1B49	Drive Motor "A" Control Module Internal Electronic Failure
		P060647	Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
		P060B49	Hybrid/EV Powertrain Control Module A/D Processing Internal Electronic Failure
		P060687	Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message
		P060A47	Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure
		P060A87	Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message
	Motor generator control system	P0A1B1F	Generator Control Module Circuit Intermittent
		P0A1A47	Generator Control Module Watchdog / Safety μC Failure
		P0A1A49	Generator Control Module Internal Electronic Failure
		P1C2A1C	Generator A/D Converter Circuit Circuit Voltage Out of Range
		P1C2A49	Generator A/D Converter Circuit Internal Electronic Failure
		P313383	Communication Error from Generator to Drive Motor "A" Value of Signal Protection Calculation Incorrect
		P313386	Communication Error from Generator to Drive Motor "A" Signal Invalid
		P313387	Communication Error from Generator to Drive Motor "A" Missing Message
	Hybrid battery system	P060B49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
		P060687	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
		P060A47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
		P060A87	Hybrid/EV Battery Energy Control Module Processor from Monitoring Processor Missing Message
		P060B16	Hybrid/EV Battery Energy Control Module A/D Processing Circuit Voltage Below Threshold
		P0E2D00	Hybrid/EV Battery Energy Control Module Hybrid/EV Battery Monitor Performance
Power source circuit malfunction	Motor generator control system	P06D61C	Generator Control Module Offset Power Circuit Voltage Out of Range
Communication system malfunction	Hybrid control system	P312387	Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message
Communication system malfunction	Hybrid control system	U011187	Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message
Sensor and actuator circuit malfunction	Hybrid battery system	P301A1C	Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range
		P1A001C	Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range
		P1AFD1C	Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range
System malfunction	Motor generator control system	P0D2D16	Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Below Threshold
		P0D2D17	Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Above Threshold
		P0E3116	DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Below Threshold
		P0E3117	DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Above Threshold

HINT:

P0B231C may be output as a result of the malfunction indicated by the DTCs above.
1. The chart above is listed in inspection order of priority.
2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

(e) Turn the power switch off.

REPLACE BATTERY ECU ASSEMBLY

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

SEE MORE:

Components

COMPONENTS ILLUSTRATION *1 FRONT WHEEL OPENING EXTENSION PAD LH *2 FRONT WHEEL OPENING EXTENSION PAD RH *3 NO. 1 ENGINE UNDER COVER *4 NO. 2 ENGINE UNDER COVER ASSEMBLY N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 ENGINE OIL LEVEL SENSOR *2

Inspection

INSPECTION PROCEDURE 1. INSPECT AIR FUEL RATIO SENSOR (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.6 to 3.2 Ω 1 (HA1A) - 4 (A1A-) Always 10 k

Lexus ES: Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range (P0B231C)

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