STOP AND START SYSTEM(for 3ZR-FAE), 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 audio and visual 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.

If there is a malfunction in any of the electrical system circuits connected to the backup boost converter, the fuse and relay functions shut off the malfunctioning circuit to protect other circuits (remains shut off until next 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 signals.


    The backup boost converter supplies power to:

  • Main body ECU (multiplex network body ECU)

  • Skid control ECU (Brake actuator assembly)

  • Spiral with sensor cable sub-assembly

  • Power steering ECU assembly

  • Combination meter assembly

  • Radio receiver assembly, radio and display receiver assembly or navigation receiver assembly

  • Inner rear view mirror assembly

  • Lane departure warning camera

  • Tire pressure warning ECU and receiver

  • Blind spot monitor sensor LH

  • Blind spot monitor sensor RH

  • Parking assist ECU

  • Driving support ECU assembly

  • Millimeter wave radar sensor assembly

  • Network Gateway ECU

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
B22C0 BBC Overcurrent

The following condition continues for 1 second or more (1 trip detection logic):


  • Overcurrent is detected at the B41, B42, IG41 and OP21* terminals in the engine stop and start ECU

  • Engine stop and start ECU

  • Wire harness or connector

  • Power steering ECU assembly

  • Main body ECU (Multiplex network body ECU)

  • Radio receiver assembly (for Radio Receiver Type)

  • Navigation receiver assembly (for Navigation Receiver Type)

  • Radio and display receiver assembly (for Radio and Display Receiver Type)

  • Inner rear view mirror assembly (w/ EC Mirror)

  • Lane departure warning camera (w/ Lane Departure Alert System)

  • Tire pressure warning ECU and receiver (w/ Tire Pressure Warning System)

  • Blind spot monitor sensor LH (w/ Blind Spot Monitor System)

  • Blind spot monitor sensor RH (w/ Blind Spot Monitor System)

  • Driving support ECU assembly (w/ Dynamic Radar Cruise Control System)

  • Millimeter wave radar sensor assembly (w/ Dynamic Radar Cruise Control System)

  • Parking Assist ECU (w/ Panoramic View Monitor System)

  • Network Gateway ECU

 Blinks DTC stored

*: for CVT

CONFIRMATION DRIVING PATTERN

Tech Tips

DTCs for the stop and start system are not cleared automatically even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

Click here


  1. Tech Tips


    • If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.

    • 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.

    CONFIRMATION AFTER TROUBLESHOOTING


    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


      Powertrain > Stop and Start > Clear DTCs

    4. Start the engine and warm it up.

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

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

    6. for CVT:

      Depress the brake pedal and stop the vehicle.

      for Manual Transaxle:

      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. (for CVT: Keep the shift lever in D.)

    8. for CVT:

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

      for Manual Transaxle:

      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 the battery voltage is low.

    9. Check that DTCs are not output.

      Click here


      Powertrain > Stop and Start > Trouble Codes

  2. STOP AND START SYSTEM OPERATION CHECK

    Tech Tips

    If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.


    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 Confirmation Driving Pattern, obey all speed limits and traffic laws.

    4. for CVT:

      Depress the brake pedal and stop the vehicle.

      for Manual Transaxle:

      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. (for CVT: Keep the shift lever in D.)

    6. for CVT:

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

      for Manual Transaxle:

      Depress the clutch pedal and start the engine.

WIRING DIAGRAM

A01QQ11E01
A01QOUKE01
A01QTGQE01
A01QQX8E01
A01QQHBE01
*a Power Steering ECU Assembly
*b Brake Actuator Assembly
*c Spiral with Sensor Cable Sub-assembly
*d Engine Stop and Start ECU

CAUTION / NOTICE / HINT

Note


  • for CVT:

    When replacing the engine stop and start ECU with a new one, make sure to download the previous status (number of starter operations) of the old engine stop and start ECU. After replacing the engine stop and start ECU, turn the ignition switch to ON and wait 20 seconds, then confirm that "OK" is displayed for the Data List item "Oper Prohibition (O/P Air Bleeding)". Then upload the previous status (number of starter operations) to the engine stop and start ECU.

    Click here

  • for Manual Transaxle:

    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, perform deceleration sensor zero point clear and calibration

    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 B41 or IG41 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 B41, B42 or IG41 terminal in the engine stop and start ECU will not operate.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

    5. Read the DTCs.


      Powertrain > Stop and Start > Trouble Codes
      Result
      Result Proceed to
      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, BBC NO. 2 FUSES)


    1. Disconnect the A86 engine stop and start ECU connector.

    2. Remove the BBC fuse from the engine room relay block and junction block assembly.

    3. Remove the BBC NO. 2 fuse from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A86-1 (BIN2) - BBC NO. 2 fuse terminal 2 Always Below 1 Ω
      A86-3 (BIN1) - BBC fuse terminal 2 Always Below 1 Ω
      A86-1 (BIN2) - Body ground Always 10 kΩ or higher
      BBC NO. 2 fuse terminal 2 - Body ground Always 10 kΩ or higher
      A86-3 (BIN1) - Body ground Always 10 kΩ or higher
      BBC fuse terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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 G87 engine stop and start ECU connector.

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

    3. w/ EC Mirror:

      Disconnect the Q14*1 or Q15*2 inner rear view mirror assembly connector.


      • *1: w/o Lane Departure Alert System

      • *2: w/ Lane Departure Alert System

    4. w/ Tire Pressure Warning System:

      Disconnect the M30 tire pressure warning ECU and receiver connector.

    5. Disconnect the G170 network gateway ECU connector.

    6. w/ Dynamic Radar Cruise Control System:

      Disconnect the Z6 millimeter wave radar sensor assembly connector.

    7. w/ Dynamic Radar Cruise Control System:

      Disconnect the G168 driving support ECU assembly connector.

    8. w/ Lane Departure Alert System:

      Disconnect the Q17 lane departure warning camera connector.

    9. w/ Blind Spot Monitor System:

      Disconnect the R1 blind spot monitor sensor LH connector.

    10. w/ Blind Spot Monitor System:

      Disconnect the T1 blind spot monitor sensor RH connector.

    11. w/ Panoramic View Monitor System:

      Disconnect the a2 parking assist ECU connector.

    12. for Radio Receiver Type:

      Disconnect the G46 radio receiver assembly connector.

    13. for Navigation Receiver Type:

      Disconnect the G137 navigation receiver assembly connector.

    14. for Radio and Display Receiver Type:

      Disconnect the G141 radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G87-3 (IG41) - 3D-40 (IG) Always Below 1 Ω
      G87-3 (IG41) - Q14-1 (IG)*1, *10 Always Below 1 Ω
      G87-3 (IG41) - Q15-4 (IG)*2, *10 Always Below 1 Ω
      G87-3 (IG41) - M30-1 (IG)*3 Always Below 1 Ω
      G87-3 (IG41) - G170-11 (IG1) Always Below 1 Ω
      G87-3 (IG41) - Z6-8 (IGB)*4 Always Below 1 Ω
      G87-3 (IG41) - G168-7 (IGB)*4 Always Below 1 Ω
      G87-3 (IG41) - Q17-7 (IGB)*2 Always Below 1 Ω
      G87-3 (IG41) - R1-5 (BLB)*5 Always Below 1 Ω
      G87-3 (IG41) - T1-5 (BRB)*5 Always Below 1 Ω
      G87-3 (IG41) - a2-6 (IG)*6 Always Below 1 Ω
      G87-2 (B41) - a2-2 (+B)*6 Always Below 1 Ω
      G87-12 (B42) - G46-4 (+B1)*7 Always Below 1 Ω
      G87-12 (B42) - G137-4 (+B1)*8 Always Below 1 Ω
      G87-12 (B42) - G141-4 (+B1)*9 Always Below 1 Ω
      G87-3 (IG41) - Body ground Always 10 kΩ or higher
      G87-2 (B41) - Body ground Always 10 kΩ or higher
      G87-12 (B42) - Body ground Always 10 kΩ or higher

      • *1: w/o Lane Departure Alert System

      • *2: w/ Lane Departure Alert System

      • *3: w/ Tire Pressure Warning System

      • *4: w/ Dynamic Radar Cruise Control System

      • *5: w/ Blind Spot Monitor System:

      • *6: w/ Panoramic View Monitor System

      • *7: for Radio Receiver Type

      • *8: for Navigation Receiver Type

      • *9: for Radio and Display Receiver Type

      • *10: w/ EC Mirror

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ENGINE STOP AND START ECU


    1. Disconnect the A86, A66 and G87 engine stop and start ECU connectors.

      A01QTNFC02
      *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
      G87-3 (IG41) - A66-6 (DGND) Always 10 kΩ or higher
      G87-2 (B41) - A66-6 (DGND) Always 10 kΩ or higher
      G87-12 (B42) - A66-6 (DGND) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ENGINE STOP AND START ECU Click here

    OK

  5. CHECK VEHICLE CONDITION (B41, IG41 CIRCUIT)


    1. Check that additional devices installed to the vehicle (aftermarket audio system, etc.) are not connected to the B41 or IG41 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 B41 AND IG41 TERMINALS)

    B

    END (REMOVE ELECTRICAL LOAD FROM ADDITIONAL DEVICE)