DTC C1427-71: ABS Pump Motor Actuator Stuck [09/2018 - 10/2023]: Procedure

PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY)

Connect the Techstream to the DLC3.
Start the engine.

Select the Active Test using the Techstream.

Refer to DATA LIST / ACTIVE TEST [09/2018 - 10/2023]

Chassis > Brake > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition	Diagnostic Note
Motor Relay	ABS motor relay	OFF / ON	Vehicle condition: Vehicle stopped HINT: To protect this Actuator and Solenoid, this test will only last 10 seconds.	-

Chassis > Brake > Active Test

Tester Display
Motor Relay

Check the operating sound of the pump motor when operating it using the Techstream.

Result

Result	Proceed to
Operating sound is not heard.	A
Operating sound is heard.	B

Result:

See step 4

Result:

See step 2

CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

Turn the engine switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A9 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A9-1 (GND2) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

Result:

See step 3

RECONFIRM DTC

HINT:

The motor relay is in the skid control ECU (brake actuator assembly). Therefore, motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the skid control ECU (brake actuator assembly).

Reconnect the A9 skid control ECU (brake actuator assembly) connector.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

Chassis > Brake > Clear DTCs
Turn the engine switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

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

Chassis > Brake > Trouble Codes

Result

Result	Proceed to
DTC C1427-71 is not output.	A
DTC C1427-71 is 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 pump motor circuit.
If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, 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:

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:

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]

RECONFIRM DTC

HINT:

Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

Chassis > Brake > Clear DTCs
Turn the engine switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

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

Chassis > Brake > Trouble Codes

Result

Result	Proceed to
DTC C1427-71 is not output.	A
DTC C1427-71 is 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 pump motor circuit.
If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, 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:

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]