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

A01CEWIE01

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 ECM. The ECM 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

  • ECM
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)

  • Short in battery current sensor circuit

  • Battery current sensor assembly

  • ECM
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)

  • Open in battery current sensor circuit

  • Battery current sensor assembly

  • ECM

WIRING DIAGRAM

A01CFVPE05

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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: Powertrain / Engine and ECT / 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: Powertrain / Engine and ECT / 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 (FOR SFI SYSTEM) Click here

    A

  3. INSPECT BATTERY CURRENT SENSOR ASSEMBLY


    1. A01CG3BE21
      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 ASSEMBLY - ECM)


    1. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A2-3 (IB) - D41-68 (IB) Always Below 1 Ω
      A2-2 (VC5) - D41-69 (VCIB) Always Below 1 Ω
      A2-4 (E2) - D41-92 (EIB) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A2-3 (IB) or D41-68 (IB) - Body ground Always 10 kΩ or higher
      A2-2 (VC5) or D41-69 (VCIB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY CURRENT SENSOR ASSEMBLY - ECM)

    OK

    REPLACE ECM Click here