CHARGING SYSTEM, Diagnostic DTC:P1550, P1551, P1552

DTC Code DTC Name
P1550 Battery Current Sensor Circuit
P1551 Battery Current Sensor Circuit Low
P1552 Battery Current Sensor Circuit High

DESCRIPTION

The battery current sensor assembly detects the battery charge and discharge current amount. The battery current sensor assembly changes this information into a voltage signal and outputs it to the power management control ECU. Based on this signal, the power management control ECU sends power generation voltage commands to the generator.

DTC Code DTC Detection Condition Trouble Area
P1550 When the ignition switch is ON, the difference between the maximum and minimum current values is 1 A or less for 10 seconds or more (1 trip detection logic).

  • Battery current sensor assembly

  • Power management control ECU

  • Harness or connector
P1551 When the ignition switch is ON, the battery current sensor output is 0.2 V or less for 0.5 seconds or more (1 trip detection logic).

  • Battery current sensor assembly

  • Power management control ECU

  • Harness or connector
P1552 When the ignition switch is ON, the battery current sensor output is 4.8 V or higher for 0.5 seconds or more (1 trip detection logic).

  • Battery current sensor assembly

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A003CW0E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. According to the display on the tester, check for DTCs Click here.

      Result
      Result Proceed to
      DTC P1550, P1551 or P1552 is output. A
      DTCs other than P1550, P1551 and P1552 are output. B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (BATTERY CURRENT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn off all electrical devices (headlights, blower motor, wiper, rear defogger, etc.).

    3. Turn the tester on.

    4. Select the item below in the Data List, and read the display on the intelligent tester Click here.

      Charging Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Battery Current Battery current / -125 to 124.9 A Changes in response to generator power generation amount after engine warmed up while vehicle driven -
      Result
      Result Proceed to
      Current value displayed on tester is fixed at 0 A and does not change, or only changes by 1 A or less between -98 and 98 A. A
      Current value displayed on tester changes between -20 and 0 A. B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK BATTERY CURRENT SENSOR ASSEMBLY


    1. A003E5ZE11
      Text in Illustration
      *1

      Component without harness connected

      (Battery Current Sensor)

      Disconnect the B38 battery current sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (VC5) - 4 (E2) Always 3 to 10 kΩ
      2 (VC5) - 3 (IB) Always Below 0.5 kΩ
      3 (IB) - 4 (E2) Always 3 to 10 kΩ
      Result
      Result Proceed to
      OK w/ Entry and Start System A
      w/o Entry and Start System B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY CURRENT SENSOR) Click here

    C

    REPLACE BATTERY CURRENT SENSOR ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY CURRENT SENSOR)

    w/ Entry and Start System:


    1. A003EEYE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *2

      Front view of wire harness connector

      (to Battery Current Sensor)

      Disconnect the D76 power management control ECU connector.

    2. Disconnect the B38 battery current sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D76-23 (VC) - B38-2 (VC5) Always Below 1 Ω
      D76-25 (E2) - B38-4 (E2)
      D76-30 (IB) - B38-3 (IB)
      D76-23 (VC) - Body ground Always 10 kΩ or higher
      D76-25 (E2) - Body ground
      D76-30 (IB) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY CURRENT SENSOR)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY CURRENT SENSOR)

    w/o Entry and Start System:


    1. A003B7ME02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *2

      Front view of wire harness connector

      (to Battery Current Sensor)

      Disconnect the D105 power management control ECU connector.

    2. Disconnect the B38 battery current sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D105-12 (VC) - B38-2 (VC5) Always Below 1 Ω
      D105-18 (E2) - B38-4 (E2)
      D105-13 (IB) - B38-3 (IB)
      D105-12 (VC) - Body ground Always 10 kΩ or higher
      D105-18 (E2) - Body ground
      D105-13 (IB) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY CURRENT SENSOR)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here