CHARGING SYSTEM, Diagnostic DTC:P1550,P1551 and 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 ECM. Based on this signal, the ECM 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 below 1 A for 10 seconds or more (1 trip detection logic).

  • Battery current sensor assembly

  • ECM

  • Harness or connector

P1551

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

  • Battery current sensor assembly

  • ECM

  • Harness or connector

P1552

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

  • Battery current sensor assembly

  • ECM

  • Harness or connector

WIRING DIAGRAM

A299199E03

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).

      Table 1. Result

      Result

      Proceed to

      DTC P1550, P1551 or P1552 is output.

      A

      DTCs other than P1550, P1551 and P1552 are output.

      B

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    (Click here)

  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: Powertrain / Engine and ECT / Data List.

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

      Table 2. 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

      -
      Table 3. 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

    USE SIMULATION METHOD TO CHECK

    (Click here)

  3. INSPECT BATTERY CURRENT SENSOR ASSEMBLY

    1. Inspect the battery current sensor assembly (Click here).

    REPLACE BATTERY CURRENT SENSOR ASSEMBLY

    (Click here)

  4. CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR ASSEMBLY - ECM)

    1. Disconnect the C111 ECM connector.

    2. Disconnect the C50 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

      C111-117 (VCIB) - C50-2 (VC5)

      Always

      Below 1 Ω

      C111-118 (EIB) - C50-4 (E2)

      C111-86 (IB) - C50-3 (IB)

      C111-117 (VCIB) or C50-2 (VC5) - Body ground

      Always

      10 kΩ or higher

      C111-118 (EIB) or C50-4 (E2) - Body ground

      C111-86 (IB) or C50-3 (IB) - Body ground

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR