CHARGING SYSTEM, Diagnostic DTC:P1602

DTC Code DTC Name
P1602 Deterioration of Battery

DESCRIPTION

The power management control ECU monitors the battery. When the engine is running (not cranking) and the battery voltage drops below a specified level, the ECU determines that there is battery deterioration and stores this DTC.

DTC Code DTC Detection Condition Trouble Area
P1602 Battery capacity is abnormally low for 10 seconds or more when the engine is running (not cranking) (1 trip detection logic).

  • Battery

  • Harness or connector

  • AM2 NO. 2 fuse

WIRING DIAGRAM

A004SYBE05

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check for DTCs Click here.

      Result
      Result Proceed to
      Only DTC P1602 is output. A
      Other DTCs are output in addition to DTC P1602. B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK CHARGING SYSTEM


    1. Check the charging system 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 SOURCE CIRCUIT) Click here

    C

    REPAIR OR REPLACE CHARGING SYSTEM

    A

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A004SICE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D111 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D111-2 (AM21) - Body ground Always 11 to 14 V
      D111-1 (AM22) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D111-6 (GND) - Body ground Always Below 1 Ω

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A004OLYE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D104 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D104-8 (AM21) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D104-12 (GND) - Body ground Always Below 1 Ω

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR