Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001D0X9 |
Model Year Start: 2019 |
Model: Corolla Hatchback |
Prod Date Range: [06/2018 - 09/2022] |
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P070312; Brake Switch "B" Circuit Short to Battery; 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022] |
DTC
|
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 TCM. Then the TCM 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 engine switch is on (IG).
-
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
-
TCM
|
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 TCM 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.
MONITOR STRATEGY
Related DTCs
|
P0724: Stop light switch/Verify switch input
|
Required sensors/Components
|
Stop light switch assembly
|
Frequency of operation
|
Continuous
|
Duration
|
GO and STOP 5 times
|
MIL operation
|
2 driving cycles
|
Sequence of operation
|
None
|
TYPICAL ENABLING CONDITIONS
The stop light switch remains on during GO and STOP driving 5 times.
GO and STOP are defined as follows:
The monitor will run whenever the following DTCs are not stored
|
None
|
GO (Vehicle speed is 30 km/h (18.65 mph) or more)
|
Once
|
STOP (Vehicle speed is less than 3 km/h (1.86 mph))
|
Once
|
Battery voltage
|
8 V or more
|
Engine switch
|
On (IG)
|
Starter
|
OFF
|
TYPICAL MALFUNCTION THRESHOLDS
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 here
-
Connect the Techstream to the DLC3.
-
Turn the engine switch on (IG) and turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the engine switch off and wait for 2 minutes or more.
-
Turn the engine switch on (IG) and turn the Techstream on.
-
Start the engine.
-
Repeat the following procedure 5 times [*1]:
-
Stop the vehicle.
-
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
-
Input the DTC: P070312.
-
Check the DTC judgment result.
Techstream 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.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
-
Strictly observe posted speed limits, traffic laws and road conditions.
-
Do not drive the vehicle with the cable of the Techstream contacting the pedals, shift lever or steering wheel.
-
Driving the vehicle with the cable of the Techstream contacting these areas could impede vehicle control, resulting in a serious accident.
-
Do not operate the Techstream while driving the vehicle.
-
Operating the Techstream 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 here
-
Perform registration and/or initialization when parts related to the continuously variable transaxle system 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.
PROCEDURE
1.
|
READ VALUE USING TECHSTREAM (STOP LIGHT SW)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Transmission / Data List / Stop Light SW.
(e) According to the display on the Techstream, 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
|
OK:
On the Techstream 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.
NG
|
|
|
2.
|
CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION
|
(a) Check the stop light switch assembly installation.
Click here
OK:
Stop light switch assembly is installed correctly.
OK
|
|
|
3.
|
INSPECT STOP LIGHT SWITCH ASSEMBLY
|
(a) Inspect the stop light switch assembly.
Click here
OK
|
|
|
4.
|
CHECK TERMINAL VOLTAGE (STP VOLTAGE)
|
(a) Disconnect the C80 TCM connector.
*a
|
Brake pedal depressed
|
*b
|
Brake pedal released
|
*c
|
Front view of wire harness connector
(to TCM)
|
-
|
-
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
C80-34 (STP) - Body ground
|
Brake pedal released
|
Below 1.5 V
|
Brake pedal depressed
|
7.5 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
(a) Replace the TCM.
Click here
NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION
for Registration: Click here
for Initialization: Click here
|
|