AUTOMATIC 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 in the lock-up condition.

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.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P070312 Brake Switch "B" Circuit Short to Battery The 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 signal circuit

  • Stop light switch assembly

  • ECM

 Comes on DTC stored SAE: P0724

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains on. When the stop light switch remains on during "stop and go" driving, the ECM interprets this as a fault in the stop light switch, illuminates the MIL and stores this DTC. The vehicle must stop (less than 3 km/h (1.86 mph)) and go (30 km/h (18.65 mph) or more) five times for two consecutive driving cycles in order to store this DTC.

WIRING DIAGRAM

A01XNSKE02
*a FL MAIN
*b STOP
*c Stop Light Switch Assembly
*d Battery

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here

PROCEDURE


  1. READ VALUE USING GTS (STP SIGNAL)

    Tech Tips

    Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

    Note

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


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Transmission / Data List.

    6. 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 ON or OFF

      • ON: Brake pedal depressed

      • OFF: Brake pedal released

      		 -

      Powertrain > Transmission > Data List
      Tester Display
      Stop Light SW
      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.

      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. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)


    1. Disconnect the A1 stop light switch connector.

    2. Disconnect the A35 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A1-2 (L) or A35-9 (STP) - Other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. Check the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here