CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P070312

DTC Code DTC Name
P070312 Brake Switch "B" Circuit Short to Battery

DESCRIPTION

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

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

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P070312 Brake Switch "B" Circuit Short to Battery Stop light switch remains on even when the vehicle is driven in a stop (less than 3 km/h (1.86 mph)) and go (30 km/h (18.65 mph) or more) pattern 5 times (2 trip detection logic).

  • Short in stop light switch assembly circuit

  • Stop light switch assembly

  • ECM

 Comes on DTC stored

SAE Code:

P0724

MONITOR DESCRIPTION

This DTC indicates that the stop light switch is remaining on. When the stop light switch remains on during "stop and go" driving, the ECM interprets this as a malfunction of the stop light switch assembly, illuminates the MIL and stores this DTC. The vehicle must STOP (less than 3 km/h (2 mph)) and GO (30 km/h (19 mph) or more) five times for two consecutive driving cycles in order to store this DTC.

WIRING DIAGRAM

Refer to SFI system DTC P05042B.

Click here

CAUTION / NOTICE / HINT

Note


  • Perform initialization when parts related to the continuously variable transaxle are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

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

Tech Tips


  • Using the GTS, the Data List item "Stop Light SW" can be read.

    Click here

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  • After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


    1. Perform the following stop and go drive pattern 5 times:

      CAUTION:

      Perform the following procedure while strictly observing all traffic laws and speed limits.

      Accelerate the vehicle to 30 km/h (18.65 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.86 mph) or less.

    2. Turn the ignition switch off.

    3. Perform step (a) again.

    4. Check for DTCs again.

      Click here

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT 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 / Transmission / Data List / Stop Light SW.


      Powertrain > Transmission > Data List
      Tester Display
      Stop Light SW

    5. According to the display on the GTS, read the Data List.


      Powertrain > Transmission > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch status OFF or ON

      • OFF: Brake pedal released

      • ON: Brake pedal depressed

      		 -
      OK
      On the GTS screen, ON or OFF is displayed accordingly.

      Note

      In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not depend solely on these reference conditions when deciding whether a part is faulty or not.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION


    1. Check the stop light switch assembly installation.

      Click here

      OK
      Stop light switch assembly is installed correctly.
      Result
      Proceed to
      OK
      NG

    NG

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  4. CHECK TERMINAL VOLTAGE (STP VOLTAGE)


    1. Disconnect the ECM connector.

      A005OLWC03
      *a Brake pedal depressed *b Brake pedal released
      *c

      Front view of wire harness connector

      (to ECM)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A38-9 (STP) - Body ground Brake pedal released Below 1.5 V
      Brake pedal depressed 7.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here