BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C1211,C1212,C1225,C1226; SLA Linear Solenoid; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001G79B
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): C1211,C1212,C1225,C1226; SLA Linear Solenoid; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C1211

SLA Linear Solenoid

DTC

C1212

SLR Linear Solenoid

DTC

C1225

SA1 Solenoid Circuit

DTC

C1226

SA2 Solenoid Circuit

DESCRIPTION

The linear solenoids SLA and SLR control the regulator based on signals from the skid control ECU (brake booster with master cylinder assembly) and produce servo pressure in accordance with the vehicle condition.

When the system is normal, the switching solenoid SGH is opened to allow brake fluid to flow to the stroke simulator when the brake pedal is depressed. When the system is abnormal, the switching solenoid SGH closes to prevent the flow of brake fluid.

When the system is normal, the switching solenoid SSA is closed. When the system is abnormal, the switching solenoid SSA is opened to allow fluid to flow to the brake master cylinder reservoir assembly.

HINT:

If the supply voltage decreases, a drop in current may cause DTCs to be stored.
DTC C1225 indicates a malfunction related to solenoid SSA, and DTC C1226 indicates a malfunction related to solenoid SGH.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1211	SLA Linear Solenoid	21 22 23 24 25 26	INF Code: 21 Overcurrent is detected in the solenoid for 0.05 seconds or more. INF Code: 22 An open is detected in the solenoid for 0.05 seconds or more. INF Code: 23 An excessive current is detected in the solenoid for 0.05 seconds or more. INF Code: 24 Current leakage is detected in the solenoid for 0.05 seconds or more. INF Code: 25 A malfunction in the solenoid current monitoring circuit is detected for 0.05 seconds or more. INF Code: 26 Insufficient current is detected in the solenoid for 0.05 seconds or more.	INF Code: 21, 22, 24 Brake booster with master cylinder assembly INF Code: 23 Supply voltage reduced Brake booster with master cylinder assembly INF Code: 25, 26 Brake booster with master cylinder assembly	Comes on	INF Code 21: SAE Code C13C3 (Case 4) INF Code 22: SAE Code C13C2 (Case 3) INF Code 23: SAE Code C13C3 (Case 1 and 2) INF Code 24: SAE Code C13C3 (Case 3) INF Code 25: SAE Code C13C1 INF Code 26: SAE Code C13C2 (Case 1 and 2) Electronically controlled brake system DTC
C1212	SLR Linear Solenoid	31 32 33 34 35 36	INF Code: 31 Overcurrent is detected in the solenoid for 0.05 seconds or more. INF Code: 32 An open is detected in the solenoid for 0.05 seconds or more. INF Code: 33 An excessive current is detected in the solenoid for 0.05 seconds or more. INF Code: 34 Current leakage is detected in the solenoid for 0.05 seconds or more. INF Code: 35 A malfunction in the solenoid current monitoring circuit is detected for 0.05 seconds or more. INF Code: 36 Insufficient current is detected in the solenoid for 0.05 seconds or more.	INF Code: 31, 32, 34 Brake booster with master cylinder assembly INF Code: 33 Supply voltage reduced Brake booster with master cylinder assembly INF Code: 35, 36 Brake booster with master cylinder assembly	Comes on	INF Code 31: SAE Code C13CC (Case 4) INF Code 32: SAE Code C13CB (Case 3) INF Code 33: SAE Code C13CC (Case 1 and 2) INF Code 34: SAE Code C13CC (Case 3) INF Code 35: SAE Code C13CA INF Code 36: SAE Code C13CB (Case 1 and 2) Electronically controlled brake system DTC
C1225	SA1 Solenoid Circuit	41 42 43 44 45 46	INF Code: 41 Overcurrent is detected in SSA for 0.05 seconds or more. INF Code: 42 An open is detected in SSA for 0.05 seconds or more. INF Code: 43 Monitoring value of SSA continues to be excessively higher than request value. INF Code: 44 Current leakage is detected in SSA for 0.05 seconds or more. INF Code: 45 A malfunction in the SSA current monitoring circuit is detected for 0.05 seconds or more. INF Code: 46 Monitoring value of SSA continues to be excessively lower than request value.	INF Code: 41, 42, 44 Brake booster with master cylinder assembly INF Code: 43 Supply voltage reduced Brake booster with master cylinder assembly INF Code: 45, 46 Brake booster with master cylinder assembly	Comes on	INF Code 41: SAE Code C14F4 (Case 4) INF Code 42: SAE Code C14F3 (Case 3) INF Code 43: SAE Code C14F4 (Case 1 and 2) INF Code 44: SAE Code C14F4 (Case 3) INF Code 45: SAE Code C14F2 INF Code 46: SAE Code C14F3 (Case 1 and 2) Electronically controlled brake system DTC
C1226	SA2 Solenoid Circuit	71 72 73 74 75 76	INF Code: 71 Overcurrent is detected in SGH for 0.05 seconds or more. INF Code: 72 An open is detected in SGH for 0.05 seconds or more. INF Code: 73 Monitoring value of SGH continues to be excessively higher than request value. INF Code: 74 Current leakage is detected in SGH for 0.05 seconds or more. INF Code: 75 A malfunction in the SGH current monitoring circuit is detected for 0.05 seconds or more. INF Code: 76 Monitoring value of SGH continues to be excessively lower than request value.	INF Code: 71, 72, 74 Brake booster with master cylinder assembly INF Code: 73 Supply voltage reduced Brake booster with master cylinder assembly INF Code: 75, 76 Brake booster with master cylinder assembly	Comes on	INF Code 71: SAE Code C14FD (Case 4) INF Code 72: SAE Code C14FC (Case 3) INF Code 73: SAE Code C14FD (Case 1 and 2) INF Code 74: SAE Code C14FD (Case 3) INF Code 75: SAE Code C14FB INF Code 76: SAE Code C14FC (Case 1 and 2) Electronically controlled brake system DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) monitors the drive voltage and current of the linear solenoids (SLA, SLR, SSA and SGH). Based on the monitored information, if any of the following abnormal conditions are detected, the MIL is illuminated and a DTC is stored.

A malfunction of the current monitor is detected.
Based on the duty cycle, the monitored current value is considerably low.
An open circuit is detected.
Based on the duty cycle, the monitored current value is considerably high.
A current leakage is detected.
When the monitored current value increases to a value that is not possible when normal.

MONITOR STRATEGY

Related DTCs	C13C1: Linear solenoid range/performance C13C2 (Case 1): Linear solenoid circuit low C13C2 (Case 2): Linear solenoid circuit low C13C2 (Case 3): Linear solenoid circuit low C13C3 (Case 1): Linear solenoid circuit high C13C3 (Case 2): Linear solenoid circuit high C13C3 (Case 3): Linear solenoid circuit high C13C3 (Case 4): Linear solenoid circuit high C13CA: Linear solenoid range/performance C13CB (Case 1): Linear solenoid circuit low C13CB (Case 2): Linear solenoid circuit low C13CB (Case 3): Linear solenoid circuit low C13CC (Case 1): Linear solenoid circuit high C13CC (Case 2): Linear solenoid circuit high C13CC (Case 3): Linear solenoid circuit high C13CC (Case 4): Linear solenoid circuit high C14F2: Linear solenoid range/performance C14F3 (Case 1): Linear solenoid circuit low C14F3 (Case 2): Linear solenoid circuit low C14F3 (Case 3): Linear solenoid circuit low C14F4 (Case 1): Linear solenoid circuit high C14F4 (Case 2): Linear solenoid circuit high C14F4 (Case 3): Linear solenoid circuit high C14F4 (Case 4): Linear solenoid circuit high C14FB: Linear solenoid range/performance C14FC (Case 1): Linear solenoid circuit low C14FC (Case 2): Linear solenoid circuit low C14FC (Case 3): Linear solenoid circuit low C14FD (Case 1): Linear solenoid circuit high C14FD (Case 2): Linear solenoid circuit high C14FD (Case 3): Linear solenoid circuit high C14FD (Case 4): Linear solenoid circuit high
Required Sensors/Components(Main)	Skid control ECU (brake booster with master cylinder assembly) Brake actuator (brake booster with master cylinder assembly)
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly) Brake actuator (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	0.054 seconds: C13C1, C13C2 (Case 2), C13C2 (Case 3), C13C3 (Case 2), C13C3 (Case 3), C13C3 (Case 4), C13CA, C13CB (Case 2), C13CB (Case 3), C13CC (Case 2), C13CC (Case 3), C13CC (Case 4), C14F2, C14F3 (Case 2), C14F3 (Case 3), C14F4 (Case 2), C14F4 (Case 3), C14F4 (Case 4), C14FB, C14FC (Case 2), C14FC (Case 3), C14FD (Case 2), C14FD (Case 3) and C14FD (Case 4) 7 times: C14F3 (Case 1), C14F4 (Case 1), C14FC (Case 1) and C14FD (Case 1) 14 times: C13C2 (Case 1), C13C3 (Case 1), C13CB (Case 1) and C13CC (Case 1)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

C13C1, C13CA, C14F2 and C14FB

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Serial communication with high side IC	Valid
Solenoid low side operating	On

C13C2, C13CB, C14F3 and C14FC (Case 1)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Power supply for linear solenoid	Higher than 9.13 V
Command to main relay	On
Main relay	On
Serial communication with high side IC	Valid
Solenoid low side operating	On
Current	Less than 2.3 A
Difference in present target current and previous target current	0.2 A or less
Output duty cycle	Higher than 0%
Difference in present power supply voltage for linear solenoid and previous power supply voltage for linear solenoid	1 V or less
Solenoid current correction coefficient learning	Complete
Current monitor	Normal

C13C2, C13CB, C14F3 and C14FC (Case 2)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	A, B, C, D, E, F, G, H, I and J
A. Power supply for linear solenoid	Higher than 9.13 V
B. Command to main relay	On
C. Main relay	On
D. Serial communication with high side IC	Valid
E. Solenoid low side operating	On
F. Current	Less than 2.3 A
G. Difference in present target current and previous target current	0.2 A or less
H. Output duty cycle	Higher than 0%
I. Current monitor	Normal
J. Either of the following conditions is met	-
Difference in present power supply voltage for linear solenoid and previous power supply voltage for linear solenoid	Higher than 1 V
Solenoid current correction coefficient learning	Not complete

C13C2, C13CB, C14F3 and C14FC (Case 3)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Command to main relay	On
Main relay	On
Solenoid low side operating	On
Serial communication with high side IC	Valid
Output duty cycle	0%
Current monitor	Normal
Current	Less than 0.2 A

C13C3, C13CC, C14F4 and C14FD (Case 1)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Power supply for linear solenoid	Less than 16 V
Serial communication with high side IC	Valid
Solenoid low side operating	On
Difference in present target current and previous target current	0.2 A or less
Difference in present power supply voltage for linear solenoid and previous power supply voltage for linear solenoid	1 V or less
Solenoid current correction coefficient learning	Complete
Current monitor	Normal

C13C3, C13CC, C14F4 and C14FD (Case 2)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	A, B, C, D, E and F
A. Power supply for linear solenoid	Less than 16 V
B. Serial communication with high side IC	Valid
C. Solenoid low side operating	On
D. Difference in present target current and previous target current	0.2 A or less
E. Current monitor	Normal
F. Either of the following conditions is met	-
Difference in present power supply voltage for linear solenoid and previous power supply voltage for linear solenoid	Higher than 1 V
Solenoid current correction coefficient learning	Not complete

C13C3, C13CC, C14F4 and C14FD (Case 3)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Solenoid low side operating	On
Output duty cycle	0%
Current monitor	Normal

C13C3, C13CC, C14F4 and C14FD (Case 4)

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Serial communication with high side IC	Valid
Current monitor power supply	Higher than 1.09 V, and less than 1.24 V

TYPICAL MALFUNCTION THRESHOLDS

C13C1 and C13CA

One of the following conditions is met	A, B, C, D or E
A. Difference in monitor current (for solenoid control) and monitor current (for monitoring)	Higher than 0.281 A
B. Both of the following conditions are met	-
Current monitor value (for solenoid control)	33 or less
Current	Less than 2.3 A
C. Both of the following conditions are met	-
Current monitor value (for monitoring)	33 or less
Current	Less than 2.3 A
D. Reference voltage for current monitor circuit	1.24 V or more, or 1.09 V or less
E. AC/DC converter built into CPU standard voltage	4.4 V or less

C14F2 and C14FB

One of the following conditions is met	A, B, C, D or E
A. Difference in monitor current (for solenoid control) and monitor current (for monitoring)	Higher than 0.294 A
B. Both of the following conditions are met	-
Current monitor value (for solenoid control)	33 or less
Current	Less than 2.3 A
C. Both of the following conditions are met	-
Current monitor value (for monitoring)	33 or less
Current	Less than 2.3 A
D. Reference voltage for current monitor circuit	1.24 V or more, or 1.09 V or less
E. AC/DC converter built into CPU standard voltage	4.4 V or less

C13C2, C13CB, C14F3 and C14FC (Case 1)

Solenoid current to output duty cycle relationship

Within the insufficient value judgment area in the following Map A

C13C2, C13CB, C14F3 and C14FC (Case 2)

Solenoid current to output duty cycle relationship

Within the insufficient value judgment area in the following Map B

C13C2, C13CB, C14F3 and C14FC (Case 3)

Solenoid high side voltage

Higher than 5.46 V

C13C3, C13CC, C14F4 and C14FD (Case 1)

Solenoid current to output duty cycle relationship

Within the excessive value judgment area in the following Map C

C13C3, C13CC, C14F4 and C14FD (Case 2)

Solenoid current to output duty cycle relationship

Within the excessive value judgment area in the following Map D

C13C3, C13CC, C14F4 and C14FD (Case 3)

Current

0.15 A or more

C13C3, C13CC, C14F4 and C14FD (Case 4)

Current

Higher than 2.3 A

COMPONENT OPERATING RANGE

C13C1 and C13CA

All of the following conditions are met	-
Output duty cycle	Higher than 0%
Difference in monitor current (for solenoid control) and monitor current (for monitoring)	Less than 0.281 A
Current monitor value (for solenoid control)	More than 33
Current monitor value (for monitoring)	More than 33
Current	Less than 2.3 A
Reference voltage for current monitor circuit	Less than 1.24 V, and higher than 1.09 V
AC/DC converter built into CPU standard voltage	Higher than 4.4 V

C14F2 and C14FB

All of the following conditions are met	-
Serial communication with high side IC	Valid
Solenoid low side operating	On
Difference in monitor current (for solenoid control) and monitor current (for monitoring)	0.294 A or less
Current monitor value (for solenoid control)	More than 33
Current monitor value (for monitoring)	More than 33
Current	Less than 2.3 A
Reference voltage for current monitor circuit	Less than 1.24 V, and higher than 1.09 V
AC/DC converter built into CPU standard voltage	Higher than 4.4 V

C13C2, C13CB, C14F3 and C14FC (Case 1 and 2)

All of the following conditions are met	-
Power supply for linear solenoid	Higher than 9.13 V
Command to main relay	On
Main relay	On
Serial communication with high side IC	Valid
Solenoid low side operating	On
Current	Less than 2.3 A
Difference in present target current and previous target current	0.2 A or less
Output duty cycle	Higher than 0%
Current monitor	Normal
Solenoid current to output duty cycle relationship	Current is not below lower limit (Outside of the insufficient value judgment area in the following Map A)

C13C2, C13CB, C14F3 and C14FC (Case 3)

All of the following conditions are met	-
Main relay	On
Solenoid low side operating	On
Serial communication with high side IC	Valid
Output duty cycle	0%
High side IC malfunction	Not detected
Solenoid high side voltage	5.46 V or less

C13C3, C13CC, C14F4 and C14FD (Case 1 and 2)

All of the following conditions are met	-
Power supply for linear solenoid	Less than 16 V
Serial communication with high side IC	Valid
Solenoid low side operating	On
Difference in present target current and previous target current	0.2 A or less
Current monitor	Normal
Output duty cycle	Higher than 0%
Solenoid current to output duty cycle relationship	Current is not above upper limit (Outside of the excessive value judgment area in the following Map C)

C13C3, C13CC, C14F4 and C14FD (Case 3)

All of the following conditions are met	-
Main relay	On
Solenoid low side operating	On
Output duty cycle	0%
Current monitor	Normal
Current	Less than 0.15 A

C13C3, C13CC, C14F4 and C14FD (Case 4)

All of the following conditions are met	-
Main relay	On
Solenoid low side operating	On
Serial communication with high side IC	Valid
Output duty cycle	Higher than 0%
Current	Less than 2.3 A

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 (IG).
Turn the Techstream on.
Depress the brake pedal 1 or more times.
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.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder 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

PROCEDURE

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

HINT:

If a DTC for undervoltage is output, first troubleshoot the power source system.

Result	Proceed to
DTCs C1211, C1212, C1225 and C1226 are not output.	A
A DTC related to low voltage is output.	B
DTCs C1211, C1212, C1225 and/or C1226 are output.	C

USE SIMULATION METHOD TO CHECK

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY