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 When the engine is running (not cranking) and all the electrical systems are turned off, the battery voltage is below 11.85 V for 10 seconds or more (1 trip detection logic).

  • Battery

  • Harness or connector

WIRING DIAGRAM

A01IU65E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. According to the display on the tester, 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. A01IR6XE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the H71 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
      H71-2 (AM21) - Body ground Always 9.5 to 16 V
      H71-1 (AM22) - Body ground

    NG

    CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01IRSJE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the H72 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
      H72-8 (AM21) - Body ground Always 9.5 to 16 V

    NG

    CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  5. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


    1. A01IR6XE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H71-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

  6. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)


    1. A01IRSJE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H72-12 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)