BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C1247,C1392; Stroke Sensor; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001G78U
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C1247,C1392; Stroke Sensor; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C1247

Stroke Sensor

DTC

C1392

Zero Point Calibration of Stroke Sensor undone

DESCRIPTION

The brake pedal stroke sensor assembly sends a signal about the pedal stroke to the skid control ECU (brake booster with master cylinder assembly).

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1247

Stroke Sensor

211

212

213

214

215

216

217

INF Code: 211
- The sensor supply voltage (VCSK) is 4.7 V or less, or 5.3 V or more for 0.2 seconds or more.
INF Code: 212
- The sensor output voltage 1 (SKS1) is less than 0.3 V, or 4.7 V or more for 0.2 seconds or more.
INF Code: 213
- The sensor output voltage 2 (SKS2) is less than 0.3 V, or 4.7 V or more for 0.2 seconds or more.
INF Code: 214
- The difference between the current value and previous value of the sensor output voltage 1 (SKS1) is 8.5% or more for 0.2 seconds or more.
INF Code: 215
- The difference between the current value and previous value of the sensor output voltage 2 (SKS2) is 8.5% or more for 0.2 seconds or more.
INF Code: 216
- The difference in change between sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2) is excessively large for 0.2 seconds or more.
  (The comparison value of SKS1 and SKS2 is invalid.)
INF Code: 217
- Sensor data is invalid for 0.2 seconds or more.
  (The sensor data of SKS1 and SKS2 is invalid.)

INF Code: 211
- Open or short in brake pedal stroke sensor assembly power supply circuit
- Improperly connected connector, deformation or corrosion of terminals
- Skid control ECU (brake booster with master cylinder assembly)
INF Code: 212, 213, 214, 215, 216, 217
- Open or short in wire harness
- Improperly connected connector, deformation or corrosion of terminals
- Brake pedal stroke sensor assembly

Comes on

INF Code 211: SAE Code C0562
INF Code 212: SAE Code P057C and P057D
INF Code 213: SAE Code P05DD and P05DE
INF Code 214: SAE Code P057E
INF Code 215: SAE Code P05DF
INF Code 216: SAE Code P05E0
INF Code 217: SAE Code C124B
Electronically controlled brake system DTC

C1392

Zero Point Calibration of Stroke Sensor undone

1124

The brake pedal stroke sensor assembly zero point calibration is not performed.

(Normal brake pedal stroke sensor assembly zero point not memorized.)

Normal brake pedal stroke sensor assembly zero point not memorized.

(Linear solenoid valve offset learning is not performed or Test Mode is not performed or not complete.)

Only DTC C1392 (INF code 1124) is stored: Does not come on

SAE Code C1392 is stored: Comes on

INF Code 1124: SAE Code C1392
Electronically controlled brake system DTC

HINT:

During Test Mode, related DTCs are cleared (except SAE code).

MONITOR DESCRIPTION

C0562:

The skid control ECU (brake booster with master cylinder assembly) monitors the power supply voltage of the brake pedal stroke sensor assembly. When the brake pedal stroke sensor assembly power supply voltage is outside of the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the power supply is abnormal and illuminates the MIL and stores this DTC.

C124B:

When the following conditions are met, the skid control ECU (brake booster with master cylinder assembly) judges that the data from the brake pedal stroke sensor assembly is invalid and illuminates the MIL and stores this DTC.
1. Brake pedal stroke sensor assembly related DTCs (C0562, P057D, P05DE, P057C, P05DD, P05E0, P057E and P05DF) are not stored.
2. When related malfunction DTCs are not stored, the skid control ECU (brake booster with master cylinder assembly) continuously detects a brake pedal stroke sensor assembly malfunction.

SAE Code C1392:

After any of the following situations, if the zero point of the brake pedal stroke sensor 1 or brake pedal stroke sensor 2 has not been learned and the vehicle is being driven at a certain speed or more, the skid control ECU (brake booster with master cylinder assembly) judges that the zero point of the brake pedal stroke sensor is uncalibrated and illuminates the MIL and stores this DTC.
1. The skid control ECU (brake booster with master cylinder assembly) has been replaced with a new one.
2. After the brake actuator assembly, brake pedal stroke sensor assembly or brake pedal is removed and installed or replaced, the zero point is cleared.

P057C, P057D, P057E, P05DD, P05DE, P05DF and P05E0:

The skid control ECU (brake booster with master cylinder assembly) monitors the output value of the brake pedal stroke sensor assembly, and if the following conditions are detected, the skid control ECU (brake booster with master cylinder assembly) judges that the brake pedal stroke sensor assembly has a malfunction and illuminates the MIL and stores a DTC.
1. The power supply voltage ratio of the brake pedal stroke sensor 1 and brake pedal stroke sensor 2 is outside the normal range.
  HINT:
  
  The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.
2. When the brake pedal is operated, the relationship between the value output by the brake pedal stroke sensor 1 and brake pedal stroke sensor 2 is outside the normal range.
3. The difference between the current power supply voltage ratio and the previous power supply voltage ratio of the brake pedal stroke sensor 1 and brake pedal stroke sensor 2 exceeds a specific value (improbable sudden change repeats).
  HINT:
  
  The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.

C1392 (INF Code 1124):

After any of the following situations, if the zero point of the brake pedal stroke sensor 1 or brake pedal stroke sensor 2 has not been learned, the skid control ECU (brake booster with master cylinder assembly) judges that the zero point of the brake pedal stroke sensor is uncalibrated and illuminates the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights and stores this DTC.
1. The skid control ECU (brake booster with master cylinder assembly) has been replaced with a new one.
2. After the brake actuator assembly, brake pedal stroke sensor assembly or brake pedal is removed and installed or replaced, the zero point is cleared.
  HINT:
  
  As the detection conditions slightly differ from SAE code C1392, the detection conditions for DTC C1392 (INF code 1124) is also provided.

MONITOR STRATEGY

HINT:

SAE code only.

Related DTCs	C0562: Brake pedal stroke sensor assembly voltage circuit/open C124B: Brake pedal stroke sensor assembly invalid data C1392: Brake pedal stroke sensor learning not complete P057C: Brake pedal stroke sensor assembly open circuit P057D: Brake pedal stroke sensor assembly circuit high P057E: Brake pedal stroke sensor assembly intermittent/erratic P05DD: Brake pedal stroke sensor assembly open circuit P05DE: Brake pedal stroke sensor assembly circuit high P05DF: Brake pedal stroke sensor assembly intermittent/erratic P05E0: Brake pedal stroke sensor assembly "1"/"2" correlation
Required Sensors/Components(Main)	Brake pedal stroke sensor assembly Skid control ECU (brake booster with master cylinder assembly)
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly) Brake pedal stroke sensor assembly Speed sensor
Frequency of Operation	Continuous
Duration	-: C1392 0.2 seconds: C0562, C124B, P057C, P057D, P057E, P05DD, P05DE, P05DF and P05E0
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

HINT:

SAE code only.

C0562

Monitor runs whenever the following DTCs are not stored	None
Brake system voltage 1 (VM1)	Higher than 6.92 V

C124B

Monitor runs whenever the following DTCs are not stored	C0562 (Brake pedal stroke sensor assembly voltage circuit/open) P057C, P05DD (Brake pedal stroke sensor assembly open circuit) P057D, P05DE (Brake pedal stroke sensor assembly circuit high) P057E, P05DF (Brake pedal stroke sensor assembly intermittent/erratic) P05E0 (Brake pedal stroke sensor assembly "1"/"2" correlation)
All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 6.92 V
Serial communication with high side IC	Valid
Brake pedal stroke sensor assembly fail (C0562, P057C, P057D, P057E, P05DD, P05DE, P05DF, P05E0)	Not detected

C1392

Monitor runs whenever the following DTCs are not stored	None
Vehicle speed	40 km/h (25 mph) or more

P057C, P057D, P057E, P05DD, P05DE and P05DF

Monitor runs whenever the following DTCs are not stored	None
Brake pedal stroke sensor assembly power supply	4.74 V or more, and 5.23 V or less

P05E0

Monitor runs whenever the following DTCs are not stored	C0562 (Brake pedal stroke sensor assembly voltage circuit/open) C124B (Brake pedal stroke sensor assembly invalid data) P057C, P05DD (Brake pedal stroke sensor assembly open circuit) P057D, P05DE (Brake pedal stroke sensor assembly circuit high) P057E, P05DF (Brake pedal stroke sensor assembly intermittent/erratic)
Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 6.92 V
Brake pedal stroke sensor assembly fail (C0562, C124B, P057C, P057D, P057E, P05DD, P05DE, P05DF)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

HINT:

SAE code only.

C0562

Brake pedal stroke sensor assembly power supply

Less than 4.74 V, or higher than 5.23 V

C124B

Brake pedal stroke sensor assembly state

Invalid

C1392

Either of the following conditions is met	-
Brake pedal stroke sensor 1 zero point calibration value	Not stored
Brake pedal stroke sensor 2 zero point calibration value	Not stored

P057C and P05DD

Power supply voltage ratio of SKS and VSK

Less than 0.06

HINT:

The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.

P057D and P05DE

Power supply voltage ratio of SKS and VSK

Higher than 0.94

HINT:

The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.

P057E and P05DF

Difference between the current power supply voltage ratio and the previous power supply voltage ratio of SKS and VSK

Higher than 8.5%

HINT:

The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.

P05E0

Brake pedal stroke sensor assembly correlation state

Invalid

COMPONENT OPERATING RANGE

HINT:

SAE code only.

C0562

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 6.92 V
Brake pedal stroke sensor assembly power supply	4.74 V or more, and 5.23 V or less

C124B

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 6.92 V
Brake pedal stroke sensor assembly state	Valid

C1392

Both of the following conditions are met	-
Brake pedal stroke sensor 1 zero point calibration value	Stored
Brake pedal stroke sensor 2 zero point calibration value	Stored

P057C, P05DD, P057D and P05DE

Both of the following conditions are met	-
Brake pedal stroke sensor assembly power supply	4.74 V or more, and 5.23 V or less
Power supply voltage ratio of SKS and VSK	0.06 or more, and 0.94 or less

HINT:

The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.

P057E and P05DF

Both of the following conditions are met	-
Brake pedal stroke sensor assembly power supply	4.74 V or more, and 5.23 V or less
Difference between the current power supply voltage ratio and the previous power supply voltage ratio of SKS and VSK	8.5% or less

HINT:

The power supply voltage ratio is the ratio of the voltage of SKS1 and VSK1 or SKS2 and VSK2.

P05E0

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 6.92 V
Brake pedal stroke sensor assembly on experience (low/mid/high)	On

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off.
Turn the power switch on (READY).
Turn the Techstream on.
Fully depress the brake pedal.
Drive the vehicle at a speed of 40 km/h (25 mph) or more for 1 minute.
HINT:

Only DTC C1392 is stored when the vehicle speed reaches 40 km/h (25 mph).
Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTCs are output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder assembly) or brake pedal stroke sensor assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

HINT:

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE

1.	CHECK BRAKE PEDAL

(a) Check that the brake pedal and the brake pedal stroke sensor assembly are properly installed and that the pedal can be depressed normally.

(b) Check and adjust the brake pedal height.

Click here

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1247 is output.	A
DTC C1392 is output.	B

GO TO STEP 7

3.	CHECK FREEZE FRAME DATA

(a) Check the INF code from the Freeze Frame Data stored when DTC (C1247) was stored.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
INF code 211 is output.	A
INF code 212, 213, 214, 215, 216 or 217 is output.	B

GO TO STEP 6

4.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE PEDAL STROKE SENSOR ASSEMBLY)

(a) Turn the power switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Disconnect the A9 brake pedal stroke sensor assembly connector.

(e) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A48-13 (SKG1) - A9-5 (SKG)	Always	Below 1 Ω
A48-13 (SKG1) or A9-5 (SKG) - Body ground	Always	10 kΩ or higher
A48-21 (VSK2) - A9-2 (VSK2)	Always	Below 1 Ω
A48-21 (VSK2) or A9-2 (VSK2) - Body ground	Always	10 kΩ or higher
A48-25 (VSK1) - A9-4 (VCSK)	Always	Below 1 Ω
A48-25 (VSK1) or A9-4 (VCSK) - Body ground	Always	10 kΩ or higher
A48-33 (SKG2) - A9-3 (SKG2)	Always	Below 1 Ω
A48-33 (SKG2) or A9-3 (SKG2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

(a) Reconnect the A48 skid control ECU (brake booster with master cylinder assembly) connector.

*a	Front view of wire harness connector (to Brake Pedal Stroke Sensor Assembly)

(b) Turn the power switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
A9-4 (VCSK) - A9-5 (SKG)	Power switch on (IG)	4.84 to 5.16 V
A9-2 (VSK2) - A9-3 (SKG2)	Power switch on (IG)	4.84 to 5.16 V

REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE PEDAL STROKE SENSOR ASSEMBLY)

(a) Turn the power switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Disconnect the A9 brake pedal stroke sensor assembly connector.

(e) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A48-17 (SKS1) - A9-6 (SKS1)	Always	Below 1 Ω
A48-17 (SKS1) or A9-6 (SKS1) - Body ground	Always	10 kΩ or higher
A48-19 (SKS2) - A9-1 (SKS2)	Always	Below 1 Ω
A48-19 (SKS2) or A9-1 (SKS2) - Body ground	Always	10 kΩ or higher

REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	PERFORM BRAKE PEDAL STROKE SENSOR ASSEMBLY ZERO POINT CALIBRATION

(a) Perform brake pedal stroke sensor assembly zero point calibration.

Click here

NOTICE:

Make sure to perform linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization after performing "Reset Memory" as the data stored during linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization is cleared.

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Reset Memory

Chassis > ABS/VSC/TRAC > Utility

Tester Display
ECB Utility

8.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1392 is output.	A
DTCs are not output.	B
DTCs other than C1392 are output.	C

END

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

9.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Brake Pedal Stroke Sensor Assembly)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A9-4 (VCSK) - A9-5 (SKG)	Power switch on (IG)	4.84 to 5.16 V
A9-2 (VSK2) - A9-3 (SKG2)	Power switch on (IG)	4.84 to 5.16 V

REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY