Lexus NX manuals

Lexus NX: Hybrid Battery "A" Voltage (P0B23-129)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Hybrid Battery "A" Voltage (P0B23-129)

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:

Inside of battery voltage sensor VB sensor circuit malfunction
  • Battery voltage sensor malfunction
  • Communication (wire harness) malfunction
High voltage system malfunction
  • HV battery malfunction

DESCRIPTION

The battery voltage sensor (battery energy control module) 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

P0B23-129

Hybrid Battery "A" Voltage

Battery voltage sensor malfunction ("Power Resource VB" output value is abnormal):

When not boosting the difference between "Power Resource VB" and "VL-Voltage before Boosting" is large, and also "Power Resource VB" and "VH-Voltage after Boosting" is large.

(1 trip detection logic)

Battery voltage sensor

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P0B23-129
  • Power Resource VB
  • VL-Voltage before Boosting
  • VH-Voltage after Boosting
  • Boost Ratio

The following items can be helpful when performing repairs:

Data List
  • Ready Signal

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 voltage sensor 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 129): Voltage (VB) sensor deviation

Required sensors/components

Battery voltage sensor

Frequency of operation

-

Duration

TMC's intellectual property

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 129) is not detected

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 and wait for 30 seconds or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. Turn the power switch on (READY).
  7. With the shift lever in D, depress both the accelerator pedal and brake pedal at the same time to raise the SOC to a sufficient level.
  8. Move the shift lever to P, check that the engine is stopped and move the shift lever to N.
  9. Set the A/C for maximum cooling.
  10. Leave the vehicle for a few minutes.
  11. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
  12. Read the current DTCs.

    HINT:

    • If a current DTC is output, the system is malfunctioning.
    • If current DTCs are not output, perform the following steps to check for permanent DTCs.
  13. Check that the permanent DTCs are cleared.
  14. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

CAUTION / NOTICE / HINT

NOTICE:

Performing the check procedures for a long time with the shift lever in N may cause DTC P3000-388 to be set.

HINT:

  • If it is necessary to replace the battery voltage sensor, voltages need to be confirmed after installing the new battery voltage sensor. Confirm that "Power Resource VB", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" in the Data List are 280 V or more with the power switch on (READY), the shift lever in P, and the engine stopped. When the system is normal, the "Power Resource VB", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" values should be almost equal (voltage boosting will not occur when the shift lever is in N). If the difference between each voltage exceeds the values specified below, there is a malfunction.

    Inspection voltage

    Maximum voltage difference

    Difference between "Power Resource VB" and "VL-Voltage before Boosting"

    34 V

    Difference between "Power Resource VB" and "VH-Voltage after Boosting"

    31 V

    Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting"

    42 V
  • After the repair, if "VL-Voltage before Boosting" and "Power Resource VB" are approximately the same when the power switch is turned on (READY) with the shift lever in P and the accelerator pedal not depressed, the condition is judged as normal.

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P0B23-129 only is output, or DTCs except the ones in the tables below are also output.

A

DTCs shown in Table 1 are output simultaneously.

B

DTCs shown in Table 2 are output simultaneously.

C

Table 1:

Malfunction Content

Relevant DTC

Microcomputer malfunction

P0A1A-151, 658

Generator Control Module

P0A1B-786

Drive Motor "A" Control Module

P0A1D-148

Hybrid Powertrain Control Module

P1C2A-155

Generator A/D Converter Circuit

P1CA6-156

Generator Control Module Malfunction

P1CA7-193

Drive Motor Control Module Malfunction

P2511-149

HV CPU Power Relay Sense Circuit Intermittent No Continuity

P3133-659

Communication Error from Generator to Drive Motor "A"

P3134-661

Communication Error from Drive Motor "A" to Generator

P324E-788

MG-ECU Power Relay Intermittent Circuit

Power source circuit malfunction

P06E6-164

Sensor Power Supply "C" Circuit / Open

P1C73-512

Sensor Standard Voltage "F" Circuit / Open

Communication system malfunction

U0110 (all INF codes)*

Lost Communication with Drive Motor Control Module "A"

System malfunction

P0D2F-266

Drive Motor "A" Inverter Voltage Sensor Circuit Low

P0D30-267

Drive Motor "A" Inverter Voltage Sensor Circuit High

P0E33-589

DC/DC Converter Voltage Sensor "A" Low

P0E34-590

DC/DC Converter Voltage Sensor "A" High

Table 2:

Malfunction Content

Relevant DTC

Microcomputer malfunction

P0AFC-123

Hybrid Battery Pack Sensor Module

Sensor and actuator circuit malfunction

P0B3D-123

Hybrid Battery Voltage Sensor "A" Circuit Low

P0B42-123

Hybrid Battery Voltage Sensor "B" Circuit Low

P0B47-123

Hybrid Battery Voltage Sensor "C" Circuit Low

P0B4C-123

Hybrid Battery Voltage Sensor "D" Circuit Low

P0B51-123

Hybrid Battery Voltage Sensor "E" Circuit Low

P0B56-123

Hybrid Battery Voltage Sensor "F" Circuit Low

P0B5B-123

Hybrid Battery Voltage Sensor "G" Circuit Low

P0B60-123

Hybrid Battery Voltage Sensor "H" Circuit Low

P0B65-123

Hybrid Battery Voltage Sensor "I" Circuit Low

P0B6A-123

Hybrid Battery Voltage Sensor "J" Circuit Low

P0B6F-123

Hybrid Battery Voltage Sensor "K" Circuit Low

P0B74-123

Hybrid Battery Voltage Sensor "L" Circuit Low

P0B79-123

Hybrid Battery Voltage Sensor "M" Circuit Low

P0B7E-123

Hybrid Battery Voltage Sensor "N" Circuit Low

P0B83-123

Hybrid Battery Voltage Sensor "O" Circuit Low

P0B88-123

Hybrid Battery Voltage Sensor "P" Circuit Low

P0B8D-123

Hybrid Battery Voltage Sensor "Q" Circuit Low

P0B92-123

Hybrid Battery Voltage Sensor "R" Circuit Low

P308A-123

Hybrid Battery Voltage Sensor All Circuits Low

HINT:

  • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
  • P0B23-129 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.

A

REPLACE BATTERY VOLTAGE SENSOR

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

C

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

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