Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001HTLX |
Model Year Start: 2020 |
Model: Corolla Hatchback |
Prod Date Range: [03/2019 - 03/2023] |
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P070312; Brake Switch "B" Circuit Short to Battery; 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 03/2023] |
DTC
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P070312
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Brake Switch "B" Circuit Short to Battery
|
DESCRIPTION
The stop light switch assembly is part of a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. This DTC indicates that the stop light switch assembly remains on. When the stop light switch assembly remains on during "STOP and GO" driving, the ECM interprets this as a fault in the stop light switch assembly. The ECM stores the DTC.
DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
|
MIL
|
Memory
|
Note
|
P070312
|
Brake Switch "B" Circuit Short to Battery
|
The stop light switch assembly remains on even when vehicle repeats 5 cycles of STOP (less than 3 km/h [1.86 mph]) and GO (30 km/h [18.65 mph] or more) (2 trip detection logic).
|
-
Short in stop light switch assembly circuit
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Stop light switch assembly
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ECM
|
Does not come on
|
DTC stored
|
-
SAE Code: P0724
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DTC for Mexico Models: Applies
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MONITOR DESCRIPTION
This DTC indicates that the stop light switch assembly remains on. When the stop light switch assembly remains on during "STOP and GO" driving, the ECM interprets this as a fault in the stop light switch assembly. The ECM stores the DTC. The vehicle must STOP (less than 3 km/h [1.86 mph]) and GO (30 km/h [18.65 mph] or more) 5 times during 2 driving cycles, in order to detect a malfunction.
MONITOR STRATEGY
Required Sensors/Components (Main)
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Stop light switch assembly
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Required Sensors/Components (Related)
|
Speed sensor
|
Frequency of Operation
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Continuous
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CONFIRMATION DRIVING PATTERN
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Connect the Techstream to the DLC3.
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Turn the ignition switch to ON.
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Turn the Techstream on.
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Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
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Turn the ignition switch off and wait for at least 30 seconds.
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Turn the ignition switch to ON.
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Turn the Techstream on.
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Wait 5 seconds [A].
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Enter the following menus: Powertrain / Engine / Trouble Codes [B].
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Read the pending DTCs.
HINT:
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If a pending DTC is output, the system is malfunctioning.
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If a pending DTC is not output, perform the following procedure.
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Enter the following menus: Powertrain / Engine / Utility / All Readiness.
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Input the DTC: P070312.
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Check the DTC judgment result.
Techstream Display
|
Description
|
NORMAL
|
-
DTC judgment completed
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System normal
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ABNORMAL
|
-
DTC judgment completed
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System abnormal
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INCOMPLETE
|
-
DTC judgment not completed
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Perform driving pattern after confirming DTC enabling conditions
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HINT:
-
If the judgment result is NORMAL, the system is normal.
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If the judgment result is ABNORMAL, the system has a malfunction.
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If the judgment result is INCOMPLETE, perform steps [C] through [E].
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Start the engine [C].
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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 [D]. Repeat step [D] 5 times.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
-
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
-
Read the pending DTCs.
HINT:
-
If a pending DTC is output, the system is malfunctioning.
-
If a pending DTCs are not output, perform the following procedure.
-
Enter the following menus: Powertrain / Engine / 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
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Perform driving pattern after confirming DTC enabling conditions
|
HINT:
-
If the judgment result is NORMAL, the system is normal.
-
If the judgment result is ABNORMAL, the system has a malfunction.
WIRING DIAGRAM
Refer to DTC P05042B.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
1.
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READ VALUE USING TECHSTREAM (STOP LIGHT SW)
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Stop Light SW.
Powertrain > Engine > Data List
Tester Display
|
Stop Light SW
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(e) Read the Data List displayed on the Techstream.
OK:
Techstream Display
|
Measurement Item/Range (Display)
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Normal Condition
|
Stop Light SW
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Stop light switch assembly status: ON or OFF
|
-
ON: Brake pedal depressed
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OFF: Brake pedal released
|
NG
|
|
|
2.
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CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION
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(a) Check the stop light switch installation.
Click here
OK:
Stop light switch is installed correctly.
OK
|
|
|
3.
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CHECK TERMINAL VOLTAGE (STP VOLTAGE)
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*a
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Brake pedal depressed
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*b
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Brake pedal released
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*c
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Front view of wire harness connector
(to ECM)
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-
|
-
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(a) Disconnect the ECM connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Brake Pedal Operation
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Specified Condition
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A47-21 (STP) - Body ground
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Released
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Below 1.5 V
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Depressed
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7.5 to 14 V
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HINT:
If there is a short in the STP terminal circuit, there may be a malfunction in the circuit of a connected ECU.
NG
|
|
|
4.
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CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)
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(a) Disconnect the stop light switch assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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A53-3 (L) or A47-21 (STP) - Other terminals
|
Always
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10 kΩ or higher
|
NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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|