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

A005H4XE10

The battery current sensor assembly installed on the negative (-) battery terminal detects the amount of current supplied from the generator.

The battery current sensor assembly changes current to voltage (at the negative (-) battery terminal) and sends it to the power management control ECU*1 or engine stop and start ECU*2. The power management control ECU*1 or engine stop and start ECU*2 controls the voltage of the generator based on the signals from the battery current sensor assembly.


DTC No. DTC Detection Condition Trouble Area
P1550

Difference between the maximum and minimum current values of the battery current sensor is less than 1 A for 10 seconds or more with the ignition switch ON

(1-trip detection logic)

  • Battery current sensor assembly

  • Short in battery current sensor circuit

  • Power management control ECU*1

  • Engine stop and start ECU*2
P1551

Battery current sensor output value is less than 0.2 V for 0.5 seconds or more with the ignition switch ON

(1-trip detection logic)

  • Battery current sensor assembly

  • Open or short to GND in battery current sensor circuit

  • Power management control ECU*1

  • Engine stop and start ECU*2
P1552

Battery current sensor output value is more than 4.8 V for 0.5 seconds or more with the ignition switch ON

(1-trip detection logic)

  • Battery current sensor assembly

  • Short to +B or VC in battery current sensor circuit

  • Power management control ECU*1

  • Engine stop and start ECU*2

WIRING DIAGRAM

Refer to DTC P0516 Click here.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P1550, P1551, P1552)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Charging Control / DTC.

    5. Read the DTC.

      Result
      Result Proceed to
      DTC P1550, P1551 and P1552 are output A
      DTC P1550, P1551, P1552 and other DTCs are output B

      Tech Tips

      If any DTCs other than P1550, P1551 and P1552 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (BATTERY CURRENT)


    1. Turn all of the electrical systems (headlights, blower motor, rear defogger, etc.) off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Body / Charging Control / Data List / Battery Current.

      Result
      Result Proceed to
      Battery current is fixed at 0 A, or fluctuates by +/- 1 A or less between -100 and 100 A A
      Battery current fluctuates between -20 and 0A B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. INSPECT BATTERY CURRENT SENSOR ASSEMBLY


    1. A005LERE29
      Text in Illustration
      *a

      Component without harness connected

      (Battery Current Sensor Assembly)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the A31 battery current sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (VC5) - 4 (E2) Always 0.1 to 10 kΩ
      2 (VC5) - 3 (IB) Always Below 0.5 kΩ
      3 (IB) - 4 (E2) Always 0.05 to 10 kΩ

    4. Reconnect the cable to the negative (-) battery terminal.


    NG

    REPLACE BATTERY CURRENT SENSOR ASSEMBLY Click here

    OK

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


    1. w/o Stop and Start System


      1. Disconnect the A52 power management control ECU connector.

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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        A52-12 (VC) - A31-2 (VC5) Always Below 1 Ω
        A52-13 (IB) - A31-3 (IB) Always Below 1 Ω
        A52-18 (E2) - A31-4 (E2) Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        A52-12 (VC) or A31-2 (VC5) - Body ground Always 10 kΩ or higher
        A52-13 (IB) or A31-3 (IB) - Body ground Always 10 kΩ or higher
        A52-18 (E2) or A31-4 (E2) - Body ground Always 10 kΩ or higher

    2. w/ Stop and Start System


      1. Disconnect the A53 engine stop and start ECU connector.

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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        A53-26 (VC) - A31-2 (VC5) Always Below 1 Ω
        A53-25 (IB) - A31-3 (IB) Always Below 1 Ω
        A53-24 (E2) - A31-4 (E2) Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        A53-26 (VC) or A31-2 (VC5) - Body ground Always 10 kΩ or higher
        A53-25 (IB) or A31-3 (IB) - Body ground Always 10 kΩ or higher
        A53-24 (E2) or A31-4 (E2) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (w/o Stop and Start System) B
      OK (w/ Stop and Start System) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE ENGINE STOP AND START ECU Click here