STOP AND START SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips

*: Use the GTS.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS


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  3. PRE-CHECK


    1. Measure the battery voltage.

      Standard Voltage
      11 to 14 V

      If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

      Tech Tips


      • Whether the vehicle battery is discharged can be checked simply by operating the horn.

      • After recharging the battery, initialize the integrated current value* and drive the vehicle until stop and start control operation is permitted (approximately 15 to 40 minutes).

        *: Disconnect the cables from the battery, wait for 30 seconds or more and then reconnect the cables.

    2. Check the fuses and relays.

    3. Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.


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  4. CHECK DTC AND FREEZE FRAME DATA*


    1. Check for DTCs Click here.

    2. Check for freeze frame data.

      Tech Tips

      Record or print DTCs and freeze frame data if necessary.

    3. Clear the DTCs and freeze frame data Click here.

    4. Recheck for DTCs Click here.

      Tech Tips

      If any DTCs for the CAN communication system are output, troubleshoot those DTCs first.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

      B

      GO TO DIAGNOSTIC TROUBLE CODE CHART Click here.
      A

  5. PROBLEM SYMPTOMS TABLE


    1. Refer to Problem Symptoms Table Click here.

      Result
      Result Proceed to
      Fault is not listed in problem symptoms table A
      Fault is listed in problem symptoms table B

      B

      Go to step 7
      A

  6. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List / Active Test Click here.

    2. Terminals of ECU Click here.


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  7. REPAIR OR REPLACE


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  8. CONFIRMATION TEST


    1. Warm up the engine.

    2. Turn the air conditioning system off.

    3. Drive the vehicle for 15 to 40 minutes.

    4. Stop the vehicle, move the shift lever to neutral and release the clutch pedal. Check if the engine is stopped by the stop and start control.

      Tech Tips

      If the engine is not stopped by stop and start control, air fuel ratio learning and idle speed learning are necessary. Allow the engine to idle for 3 minutes and check that the engine speed is within 50 rpm of the target idle speed.

    5. Depress the clutch pedal and check that the engine restarts.


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      END