DTC C1427-71: ABS Pump Motor Actuator Stuck [12/2023 - ]: Procedure

1. Perform the Active Test of the motor relay using the GTS.

   Chassis > Brake/EPB > 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 5 seconds.	Operating sound of motor can be heard

   Chassis > Brake/EPB > Active Test 

   Tester Display
   Motor Relay

   Result

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

Result: 

B 

See step  4

Result: 

A 

See step  2

Pre-procedure1

1. None

   Procedure1

2. Operate the GTS to clear the codes.

   Chassis > Brake/EPB > Clear DTCs 

   Result

   Proceed to
   NEXT

   Post-procedure1

3. Turn the ignition switch off.

Result: 

NEXT 

See step  3

Pre-procedure1

1. Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

   Procedure1

2. Operate the GTS to read the DTCs.

   Chassis > Brake/EPB > Trouble Codes 

   HINT: 

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

   Result	Proceed to
   C1427-71 is not output	A
   C1427-71 is output	B

   Post-procedure1

3. None

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2023 - ] 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Pre-procedure1

1. Turn the ignition switch off.

   Procedure1

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

   OK

   The connector is securely connected.

   Pre-procedure2

3. Disconnect the A25 skid control ECU (brake actuator assembly) connector.

   Procedure2

4. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

   Procedure3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A25-30 (GND2) - Body ground	1 minute or more after disconnecting the cable from the negative (-) battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

6. None

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR