STOP AND START SYSTEM, Diagnostic DTC:B22C0

DTC Code DTC Name
B22C0 BBC Overcurrent

DESCRIPTION

A backup boost converter is built into the engine stop and start ECU. The backup boost converter helps maintain battery voltage to prevent various functions from failing if power source voltage supplied to the power steering system, etc. drops due to the high electrical load when the engine is restarted by stop and start control. The backup boost converter helps maintain the power source voltage if the battery voltage drops due to the high electrical load when the engine is restarted by stop and start control. The backup boost converter helps maintain the power source voltage at 13.5 V when its mode changes from standby mode to compensation mode. If the backup boost converter cannot maintain the voltage at the specified level when the engine is restarted by stop and start control, the engine stop and start ECU stores a DTC and blinks the stop and start cancel indicator light. The stop and start cancel indicator light will remain blinking during the trip in which the malfunction occurred.

Tech Tips

A relay function and fuse function are provided in the backup boost converter for the electrical systems that supply power to the main body ECU (multiplex network body ECU) and combination meter assembly. If there is a malfunction in any of the electrical system circuits connected to the backup boost converter, the fuse function operates to protect the malfunctioning electrical system circuit and the relay function shuts off the circuit until the end of the trip. When the electrical system circuit is shut off, power to the circuit is cut off, causing any systems connected to the circuit to be disabled. The fuse function is reset*1 when the ignition switch is turned off. If the malfunction still exists in the electrical system circuit that has been shut off by the relay function, it will be shut off again by the relay and fuse functions the next time the ignition switch is turned to ON.

*1: A semiconductor fuse self resets according to electric signal.


    The backup boost converter supplies power to:

  • Main body ECU (multiplex network body ECU)

  • VSC system

  • Power steering system

  • Meter/gauge system

  • Tire pressure warning system

DTC No. DTC Detection Condition Trouble Area
B22C0 Overcurrent is detected at the BO1 and IGO1 terminals in the engine stop and start ECU for 1 second or more (1 trip detection logic).

  • Engine stop and start ECU

  • Wire harness or connector

  • Spiral cable with sensor sub-assembly

  • Skid control ECU (Brake actuator assembly)

  • Power steering ECU assembly

  • Main body ECU (Multiplex network body ECU)

  • Radio and display receiver assembly*1

  • Radio receiver assembly*2

  • Combination meter assembly

CONFIRMATION DRIVING PATTERN


  1. After troubleshooting, perform the following steps to recheck for DTCs.

    Tech Tips


    • If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. After connecting the cable, drive the vehicle until refresh charge is completed and stop and start control is permitted (approximately 15 to 40 minutes).

    • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.


    1. for Manual transaxle


      1. Connect the GTS to the DLC3.

      2. Turn the ignition switch to ON and turn the GTS on.

      3. Clear the DTCs Click here.

      4. Start the engine and warm it up.

      5. Drive the vehicle at 7 km/h (4.3 mph) or more.

        CAUTION:

        When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      6. Stop the vehicle, move the shift lever to neutral and release the clutch pedal.

      7. Keep the engine stopped by stop and start control for 1 second or more.

      8. Depress the clutch pedal and start the engine.

        Tech Tips

        If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.

      9. Check that DTCs are not output Click here.

    2. for CVT


      1. Connect the GTS to the DLC3.

      2. Turn the ignition switch to ON and turn the GTS on.

      3. Clear the DTCs Click here.

      4. Start the engine and warm it up.

      5. Drive the vehicle at 7 km/h (4.3 mph) or more.

        CAUTION:

        When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      6. Depress the brake pedal and stop the vehicle.

      7. Keep the engine stopped by stop and start control for 1 second or more (Keep the shift lever in D).

      8. Release the brake pedal with the shift lever in D to start the engine.

        Tech Tips

        If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.

      9. Check that DTCs are not output Click here.

  2. Check if the stop and start system operates normally.

    Tech Tips

    If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. After connecting the cable, drive the vehicle until refresh charge is completed and stop and start control is permitted (approximately 15 to 40 minutes).


    1. for Manual transaxle


      1. Start the engine and warm it up.

      2. Turn the air conditioning system off.

      3. Drive the vehicle at 7 km/h (4.3 mph) or more.

        CAUTION:

        When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      4. Stop the vehicle, move the shift lever to neutral and release the clutch pedal.

      5. Allow the engine to stop by stop and start control.

      6. Depress the clutch pedal and start the engine.

    2. for CVT


      1. Start the engine and warm it up.

      2. Turn the air conditioning system off.

      3. Drive the vehicle at 7 km/h (4.3 mph) or more.

        CAUTION:

        When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      4. Depress the brake pedal and stop the vehicle.

      5. Keep the engine stopped by stop and start control for 1 second or more (Keep the shift lever in D).

      6. Release the brake pedal with the shift lever in D to start the engine.

WIRING DIAGRAM

A01VGHYE02
A01VFPHE02

CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU Click here.

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU Click here.

  • After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU Click here.

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips


  • Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting Click here.

  • If electrical load from additional devices installed on the vehicle (aftermarket audio system, etc.) is applied to the BO1 or IGO1 terminal in the engine stop and start ECU, the fuse function of the backup boost converter may operate. If the fuse function of the backup boost converter operates, any systems connected to the BO1 or IGO1 terminal in the engine stop and start ECU will not operate.

  • If DTCs P1539 and B22C0 are output simultaneously, troubleshoot for DTC P1539 (oil pump malfunction) first, as a malfunction which causes DTC P1539 to be stored may also cause DTC B22C0 (BBC boost converter over-current) to be stored.

PROCEDURE


  1. CONFIRM DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Check for DTCs and read the freeze frame data.

      Result
      Result Proceed to
      Only DTC B22C0 is output A
      DTC P1539 and B22C0 are output B

    B

    GO TO DTC P1539 Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BBC FUSE)


    1. Disconnect the A91 engine stop and start ECU connector.

    2. Remove the BBC fuse from engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A91-7 (BIN) - BBC fuse terminal 2 Always Below 1 Ω
      A91-7 (BIN) or BBC fuse terminal 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)


    1. Disconnect the F131 engine stop and start ECU connector.

    2. Disconnect the F113 radio and display receiver assembly connector. (for Radio and Display Receiver Type)

    3. Disconnect the F45 radio receiver assembly connector. (for Radio Receiver Type)

    4. Disconnect the A78 skid control ECU (brake actuator assembly) connector. (for LHD with CVT, and RHD)

    5. Disconnect the A79 skid control ECU (brake actuator assembly) connector. (for LHD except CVT)

    6. Disconnect the F6 power steering ECU assembly connector.

    7. Disconnect the 3A instrument panel junction block assembly (main body ECU (multiplex network body ECU)) connector.

    8. Disconnect the F30 spiral cable with sensor sub-assembly connector.

    9. Disconnect the K51 tire pressure warning ECU and receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F131-2 (BO1) - F113-4 (+B1)*1 Always Below 1 Ω
      F131-2 (BO1) - F45-4 (+B1)*2 Always Below 1 Ω
      F131-12 (IGO1) - A78-20 (IG1)*3 Always Below 1 Ω
      F131-12 (IGO1) - A79-20 (IG1)*4 Always Below 1 Ω
      F131-12 (IGO1) - F6-1 (IG) Always Below 1 Ω
      F131-12 (IGO1) - 3A-40 (IG) Always Below 1 Ω
      F131-12 (IGO1) - F30-5 (IG) Always Below 1 Ω
      F131-12(IGO1) - K51-1(IG) Always Below 1 Ω
      F131-2 (BO1) or F113-4 (+B1)*1 - Body ground Always 10 kΩ or higher
      F131-2 (BO1) or F45-4 (+B1)*2 - Body ground Always 10 kΩ or higher
      F131-12 (IGO1), A78-20 (IG1)*3, A79-20 (IG1)*4, F6-1 (IG), 3A-40 (IG), F30-5 (IG) or K51-1 (IG) - Body ground Always 10 kΩ or higher

      • *1: for Radio and Display Receiver Type

      • *2: for Radio Receiver Type

      • *3: for LHD with CVT, and RHD

      • *4: for LHD except CVT


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ENGINE STOP AND START ECU


    1. Disconnect the engine stop and start ECU connector.

      A01VGRNE01
      Text in Illustration
      *a

      Component without harness connected

      (Engine Stop and Start ECU)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F131-2 (BO1) - A91-8 (GND) Always 10 kΩ or higher
      F131-12 (IGO1) - A91-8 (GND) Always 10 kΩ or higher

    NG

    REPLACE ENGINE STOP AND START ECU Click here

    OK

  5. CHECK VEHICLE CONDITION (BO1, IGO1 CIRCUIT)


    1. Check that additional devices installed to the vehicle (aftermarket audio system, etc.) are not connected to the BO1 or IGO1 terminal circuit in the engine stop and start ECU.

      Result
      Result Proceed to
      Load from an additional device installed to the vehicle (aftermarket audio system, etc.) is not applied. A
      Load from an additional device installed to the vehicle (aftermarket audio system, etc.) is applied. B

    A

    GO TO TROUBLE AREAS (TROUBLESHOOTING PROCEDURE FOR ECUS CONNECTED TO BO1 AND IGO1)

    B

    END (REMOVE ELECTRICAL LOAD FROM ADDITIONAL DEVICE)