SFI SYSTEM, Diagnostic DTC:P0724

DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling when brakes are suddenly applied while driving with the lock-up torque converter clutch on.

When the brake pedal is depressed, this switch sends a signal to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains on. When the stop light switch remains on during GO and STOP driving, the ECM interprets this as a fault in the stop light switch. Then the MIL illuminates and the ECM stores the DTC. The vehicle must GO (30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph)) 5 times for 2 driving cycles in order for the DTC to be stored.

CONFIRMATION DRIVING PATTERN

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to ON and turn the intelligent tester on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

4. Turn the ignition switch off and wait for at least 30 seconds.

5. Turn the ignition switch to ON and turn the intelligent tester on [A].

6. Wait 5 seconds.

7. Enter the following menus: Powertrain / Engine and ECT / DTC [B].

8. Read the pending DTCs.

   Tech Tips

   
   

   • If a pending DTC is output, the system is malfunctioning.

   • If a pending DTC is not output, perform the following procedure.

9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

10. Input the DTC: P0724.

11. Check the DTC judgment result.

    Intelligent tester Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips

    
    

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [C] through [E].

12. Start the engine [C].

13. Accelerate the vehicle to 30 km/h (19 mph) or more, and then depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less [D]. Repeat step [D] 5 times.

    CAUTION:

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

14. Check the DTC judgment result [E].

WIRING DIAGRAM

Refer to DTC P0504 Click here.

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

   
   

   1. Check the stop light switch assembly installation.

      OK
      Stop light switch assembly is installed correctly.

   
   

   NG

   SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY Click here

   OK

2. READ VALUE USING STOP LIGHT SWITCH ASSEMBLY

   
   

   1. Inspect the stop light switch assembly Click here.

   
   

   NG

   REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

   OK

3. CHECK ECM (STP VOLTAGE)

   
   
   1. 

      Text in Illustration

      *a	Brake Pedal Depressed
      *b	Brake Pedal Released
      *c	Front view of wire harness connector (to ECM)

      Disconnect the ECM connector.

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

      Standard Voltage
      Tester Connection Brake Pedal Operation Specified Condition A58-9 (STP) - Body ground Released Below 1.5 V Depressed 7.5 to 14 V

   3. Reconnect the ECM connector.

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)