RM3660EC _52 Drivetrain _080728 K313 CVT _0392261 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM C

K313 CVT  CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM  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, the 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 All of the following conditions are met (2-trip detection logic):
·

The ignition switch is ON.

·

The battery voltage is 8 V or more.

·

The stop light switch assembly remains ON while 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.


·

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 assembly is remaining on. When the stop light switch assembly 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.

CONFIRMATION DRIVING PATTERN

CAUTION:

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


HINT:
·

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

·

When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON and turn the GTS on.

3.

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

4.

Turn the ignition switch off and wait for 2 minutes or more.

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Start the engine.

7.

Repeat the following procedure 5 times [*1]:

-

Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to less than 3 km/h (2 mph).

HINT:

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.



8.

Stop the vehicle.

9.

Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

10.

Input the DTC: P070312.

11.

Check the DTC judgment result.

GTS 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


N/A
·

Unable to perform DTC judgment

·

Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit



HINT:
·

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 N/A, perform the normal judgment procedure again.




CAUTION / NOTICE / HINT

CAUTION:
·
A371909

Strictly observe posted speed limits, traffic laws and road conditions.

·

Do not drive the vehicle with the cable of the GTS contacting the pedals, shift lever or steering wheel.

·

Driving the vehicle with the cable of the GTS contacting these areas could impede vehicle control, resulting in a serious accident.


·
A356953

Do not operate the GTS while driving the vehicle.

·

Operating the GTS while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result in a serious accident.



NOTICE:
·

Perform the universal trip to clear permanent DTCs.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR

·

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

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>INITIALIZATION

·

Check that no DTCs are stored after performing initialization.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR

·

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



HINT:
·

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

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DATA LIST / ACTIVE TEST

·

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.



PROCEDURE

1.READ VALUE USING GTS (STOP LIGHT SW)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Transmission / Data List / Stop Light SW.


e.

Drive the vehicle.


f.

According to the display on the GTS, read the Data List while the vehicle is being driven.

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

OFF: Brake pedal released

·

ON: Brake pedal depressed


-
Powertrain > Transmission > Data List
Tester Display
Stop Light SW
50003 373 12

OK:

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


NOTICE:

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 hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


NG

2.CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION
2.CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION
a.

Check the stop light switch assembly installation.

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>INSTALLATION

OK:

Stop light switch assembly is installed correctly.



Result:
Proceed to
OK
NG



OK

3.INSPECT STOP LIGHT SWITCH ASSEMBLY

NG

SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>INSTALLATION


3.INSPECT STOP LIGHT SWITCH ASSEMBLY
a.

Inspect the stop light switch assembly.

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

4.CHECK TERMINAL VOLTAGE (STP VOLTAGE)

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>COMPONENTS


4.CHECK TERMINAL VOLTAGE (STP VOLTAGE)
a.

Disconnect the A46 ECM connector.

C342139C07
4.25,0.833 4.667,1.083 0.417,0.25 6.448,0.583 5.885,0.854 true 0.521,0.167 0.833,0.323 0.313,0.156 10 false *a 2.167,0.177 2.479,0.333 0.313,0.156 10 false *b 4.667,0.094 4.979,0.25 0.313,0.156 10 false *c 4.333,0.875 4.792,1.073 0.458,0.198 10 false A46 6.5,0.5 7.104,0.75 0.604,0.25 10 false 9 (STP)
*a Brake pedal depressed *b Brake pedal released
*c Front view of wire harness connector
(to ECM) 		- -



b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A46-9 (STP) - Body ground Brake pedal released Below 1.5 V
Brake pedal depressed 7.5 to 14 V



Result:
Proceed to
OK
NG



OK

5.REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR