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

A004U56E09

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)

    w/ Entry and Start System:


    1. A004TK6E02
      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 9.5 to 16 V
      D111-1 (AM22) - Body ground

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    w/o Entry and Start System:


    1. A004OLYE01
      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 9.5 to 16 V

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)