ELECTRIC POWER CONTROL SYSTEM, Diagnostic DTC:B22A8

DTC Code DTC Name
B22A8 VB Terminal Voltage

DESCRIPTION

The electric power control ECU inputs the battery voltage. The electric power control ECU receives several signals and detects the battery condition, and performs load control and generator control.

DTC Code DTC Detection Condition Trouble Area
B22A8

Either of following conditions is detected:


  1. Open or GND short in VB+ terminal of electric power control ECU

  2. +B short or open in VB- terminal of electric power control ECU

  • VSSR fuse

  • Passenger side junction block (Electric power control ECU)

  • Wire harness

WIRING DIAGRAM

A01GHU9E01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (BATTERY VOLTAGE)


    1. Using the intelligent tester, read the Data List.


      1. Intelligent tester

        Electric Power Control
        Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
        Battery Voltage

        Current battery voltage value display/

        Min.: 0, Max.: 16.67 [V]

        		 Battery voltage is displayed -
        OK
        11 to 14 V

    NG

    INSPECT FUSE (VSSR) Click here

    OK

    REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU)

  2. INSPECT FUSE (VSSR)


    1. Remove the VSSR fuse from the engine room No. 1 relay block.

    2. Measure the resistance of the fuse.

      Standard resistance
      Tester Connection Condition Specified Condition
      VSSR fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. CHECK ELECTRIC POWER CONTROL ECU (VB+ INPUT VOLTAGE)

    A01GNDRE01

    1. Disconnect the A69 ECU connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      A69-18 (VB+) - A69-8 (VB-) Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU)