| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM10000000260S9 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C143A7E,C143A7F; ABS Solenoid Control Module Actuator Stuck On; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ] | ||
|
DTC |
C143A7E |
ABS Solenoid Control Module Actuator Stuck On |
|
DTC |
C143A7F |
ABS Solenoid Control Module Actuator Stuck Off |
DESCRIPTION
The ABS solenoid relay is built into the skid control ECU in the brake actuator assembly.
The ABS solenoid relay supplies power to the holding solenoid and reduction solenoid.
The solenoid relay is turned on 1.5 seconds after the ignition switch is turned to ON, and is turned off if an open or short in the solenoid is detected by self-diagnosis performed when the vehicle is starting off.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C143A7E |
ABS Solenoid Control Module Actuator Stuck On |
When voltage at terminal +BS is 9.5 V or higher, solenoid relay is OFF, relay contact is ON continuously for 4.5 seconds or more. |
Skid control ECU (brake actuator assembly) |
|
C143A7F |
ABS Solenoid Control Module Actuator Stuck Off |
When voltage at terminal +BS is 9.5 V or higher and solenoid relay is ON, relay contact is OFF continuously for 0.22 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
When C137BA2 and/or C137BA3 is output together with C143A7E and/or C143A7F, inspect and repair the trouble areas indicated by C137BA2 and/or C137BA3 first.
for C137BA2: Click here
![2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C137BA2; Brake System Control Module "A" System Voltage System Voltage Low](/t3Portal/stylegraphics/info.gif)
for C137BA3: Click here
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (+BS TERMINAL) |
|
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the A140 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A140-14 (+BS) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
CHECK HARNESS AND CONNECTOR (GND1 TERMINAL) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A140-1 (GND1) - Body ground |
1 minute or more after disconnecting the cable from the negative (-) battery terminal |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CLEAR DTC |
(a) Reconnect the A140 skid control ECU (brake actuator assembly) connector.
(b) Clear the DTCs.
Chassis > Brake/EPB > Clear DTCs
(c) Turn the ignition switch off.
|
|
4. |
RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Check if the same DTC is output.
Chassis > Brake/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs C143A7E and C143A7F are not output. |
A |
|
DTCs C143A7E and/or C143A7F are output. |
B |
HINT:
- If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly) with the ignition switch turned to ON and the stop light switch assembly off, the ECU performs self-diagnosis of the solenoid circuit.
- If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harnesses, and fuses of the skid control ECU (brake actuator assembly).
- If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
- If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.
| A |
|
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
|