CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM(for 8NR-FTS), 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

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  1. The ignition switch is ON and battery voltage is 8 V or more.

  2. The stop light switch remains on.

  3. The vehicle is driven in a GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (2 mph)) pattern 5 times

  4. 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 DTC P05042B.

Click here

CAUTION / NOTICE / HINT

Note:

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

Tip:

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

    Click hereClick hereClick 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 (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (2 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.

    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

      -

      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 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 hereClick here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    Click here

    OK

  4. CHECK TERMINAL VOLTAGE (STP VOLTAGE)

    1. Disconnect the A173 ECM connector.

      A256080C90

      *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

      A173-9 (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 hereClick here