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

A019K6IE01

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 ECU. The power management ECU 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 1 A or less for 10 seconds or more

(1 trip detection logic)

  • Open or short in battery current sensor circuit

  • Battery current sensor assembly

  • Power management control ECU
P1551

Battery current sensor output value is 0.2 V or less for 0.5 seconds or more with the engine switch on (IG)

(1 trip detection logic)

  • Open or short in battery current sensor circuit

  • Battery current sensor assembly

  • Power management control ECU
P1552

Battery current sensor output value is 4.8 V or more for 0.5 seconds or more with the engine switch on (IG)

(1 trip detection logic)

  • Short in battery current sensor circuit

  • Battery current sensor assembly

  • Power management control ECU

WIRING DIAGRAM

A019L80E04

INSPECTION PROCEDURE

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the 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, 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 electrical systems (headlights, blower motor, rear defogger, etc.) off.

    2. 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 -98 and 98 A A
      Battery current fluctuates between -20 and 0 A B

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

  3. INSPECT BATTERY CURRENT SENSOR ASSEMBLY


    1. A019PFHE02
      Text in Illustration
      *1

      Component without harness connected

      (Battery Current Sensor Assembly)

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

    2. Disconnect the 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)


    1. Disconnect the power management control ECU connector.

      A019O44E02

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A64-3 (IB) - F7-30 (IB) Always Below 1 Ω
      A64-2 (VC5) - F7-23 (VC) Always Below 1 Ω
      A64-4 (E2) - F7-25 (E2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A64-3 (IB) or F7-30 (IB) - Body ground Always 10 kΩ or higher
      A64-2 (VC5) or F7-23 (VC) - Body ground Always 10 kΩ or higher
      A64-4 (E2) or F7-25 (E2) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Battery Current Sensor Assembly)

      		 *2

      Front view of wire harness connector

      (to Power Management Control ECU)

    3. Reconnect the battery current sensor assembly connector.

    4. Reconnect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here