DTC C143A-7E: ABS Solenoid Control Module Actuator Stuck On; DTC C143A-7F: ABS Solenoid Control Module Actuator Stuck Off [09/2018 - 10/2023]: Procedure

1. Turn the engine switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
3. Disconnect the A9 skid control ECU (brake actuator assembly) connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A9-38 (+BS) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT) 

Result: 

OK 

See step  2

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A9-25 (GND1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) 

Result: 

OK 

See step  3

HINT: 

The solenoid circuits are located in the skid control ECU (brake actuator assembly). Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if any DTCs are output again before replacing the skid control ECU (brake actuator assembly).

1. Reconnect the A9 skid control ECU (brake actuator assembly) connector.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

   Chassis > Brake > Clear DTCs 

3. Turn the engine switch off.
4. Start the engine.
5. Perform a road test.
6. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

   Chassis > Brake > Trouble Codes 

   Result

   Result	Proceed to
   DTCs C143A-7E and C143A-7F are not output.	A
   DTCs C143A-7E and/or C143A-7F are output.	B

   HINT: 

   • If a speed signal of 20km/h (12 mph) or more is input to the skid control ECU (brake actuator assembly) with the engine switch on (IG) 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.

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]