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

A004QDZE14

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. 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 GTS (BATTERY CURRENT)


    1. Connect the GTS 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 GTS on.

    4. Enter the following menus: Body Electrical / Charging Control / Data List.

    5. Check the values by referring to the table below.

      Charging Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Battery Current Battery current / -125.0 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 GTS is fixed at 0 A and does not change, or only changes by 1 A or less between -125 and 124.9 A. A
      Current value displayed on GTS changes between -20 and 0 A. B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. INSPECT BATTERY CURRENT SENSOR ASSEMBLY


    1. Inspect the battery current sensor assembly Click here.

      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)


    1. Disconnect the D113 power management control ECU connector.

    2. Disconnect the R7 battery current sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D113-23 (VC) - R7-2 (VC5) Always Below 1 Ω
      D113-25 (E2) - R7-4 (E2)
      D113-30 (IB) - R7-3 (IB)
      D113-23 (VC) or R7-2 (VC5) - Body ground Always 10 kΩ or higher
      D113-25 (E2) or R7-4 (E2) - Body ground
      D113-30 (IB) or R7-3 (IB) - Body ground

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

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

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


    1. Disconnect the D112 power management control ECU connector.

    2. Disconnect the R7 battery current sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D112-12 (VC) - R7-2 (VC5) Always Below 1 Ω
      D112-18 (E2) - R7-4 (E2)
      D112-13 (IB) - R7-3 (IB)
      D112-12 (VC) or R7-2 (VC5) - Body ground Always 10 kΩ or higher
      D112-18 (E2) or R7-4 (E2) - Body ground
      D112-13 (IB) or R7-3 (IB) - Body ground

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

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