STOP AND START SYSTEM, Diagnostic DTC:P0831

DTC Code DTC Name
P0831 Clutch Pedal Switch "A" Circuit Low

DESCRIPTION

The clutch stroke sensor assembly (for detecting pedal depression amount) and clutch switch assembly (for detecting the pedal depression endpoint) are installed to the clutch pedal. When the engine is stopped by stop and start control, the engine stop and start control ECU receives the clutch pedal depression start signal from the clutch stroke sensor, and starts the engine.

When the engine stop and start control ECU detects the clutch stroke sensor ON signal and clutch switch ON signal are input simultaneously for 1.2 seconds or more, it stores a DTC and flashes the stop and start cancel indicator light.

A001XO6E01

Tech Tips

The normal signal conditions are as shown in the table below.

Signal Clutch Pedal Released In Transition Clutch Pedal Depressed
Clutch pedal stroke sensor ON OFF OFF
Clutch switch OFF OFF ON

The ECM receives the ON and OFF signals from the clutch stroke sensor, and sends them to the engine stop and start control ECU using CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
P0831 Clutch Pedal Switch "A" Circuit Low

Conditions (a) and (b) are met for 1.2 seconds or more (1 trip detection logic):

(a) Ignition switch ON

(b) Clutch switch is on when Clutch pedal stroke sensor signal is on.

  • Clutch switch assembly

  • Wire harness or connector

  • Engine stop and start ECU

 Blinking DTC stored

CONFIRMATION DRIVING PATTERN

Tech Tips

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

Click here


  1. CONFIRMATION AFTER TROUBLESHOOTING

    Tech Tips


    • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

      In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery temperature at 11°C (51°F) or higher, the refresh charge will be completed.)

    • If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

      If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

    • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.


    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.

    5. A001U59E06
      *a Clutch Switch Signal
      *b ON
      *c OFF
      *d 1 second or more

      Fully depress the clutch pedal for 1 second or more. Release the clutch pedal and wait for at least 1 second.

    6. Repeat the previous step 3 times.

    7. Check that no DTCs are output.

      Click here


      Powertrain > Stop and Start > Trouble Codes

  2. Tech Tips


    • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

      In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery temperature at 11°C (51°F) or higher, the refresh charge will be completed.)

    • If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

      If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

    • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

    STOP AND START SYSTEM OPERATION CHECK


    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. 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.

WIRING DIAGRAM

A001S9JE01

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

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

PROCEDURE


  1. READ VALUE USING GTS (CLUTCH LOWER SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Data List / Clutch Lower SW.


      Powertrain > Stop and Start > Data List
      Tester Display
      Clutch Lower SW

    5. Depress the clutch pedal and read the values displayed on the GTS.

      OK
      Tester Display Condition Normal Condition
      Clutch Lower SW Fully Depressed ON
      Clutch Lower SW Fully Released OFF
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. INSPECT CLUTCH SWITCH ASSEMBLY


    1. Inspect the clutch switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CLUTCH SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - CLUTCH START SWITCH ASSEMBLY)


    1. Disconnect the A62 engine stop and start ECU connector.

    2. Disconnect the A51 clutch switch assembly connector.

    3. Disconnect the F12 ignition or starter switch assembly connector.

    4. Disconnect the A38 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A62-17 (CLL) - A51-2 Always Below 1 Ω
      A62-17 (CLL) - Body ground and other terminals Always 10 kΩ or higher
      A51-2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR