Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018KER
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1427; Motor Malfunction; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

C1427

Motor Malfunction

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

C1427

Actuator pump motor does not operate properly.

  • Brake actuator assembly (ground circuit)
  • Brake actuator assembly (motor circuit)
  • Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the pump motor (brake actuator assembly), perform zero point calibration and store system information (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

(e) Select the Active Test using the Techstream (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DATA LIST / ACTIVE TEST ).

ABS/VSC/TRAC

Tester Display

Measurement Item

Control Range

Diagnostic Note

Motor Relay

ABS motor relay

Relay ON/OFF

Operating sound of motor can be heard

(f) Check the operating sound of the motor relay when operating it using the Techstream.

Result

Proceed to

Operating sound is heard.

A

Operating sound is not heard.

B

B

GO TO STEP 3

A

2.

INSPECT SKID CONTROL ECU (GND2 TERMINAL)

(a) Turn the ignition switch off.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A75-1 (GND2) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU (brake actuator assembly))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

OK

3.

RECONFIRM DTC

HINT:

  • This code is detected when a problem is identified in the brake actuator assembly.
  • The ABS motor relay is in the brake actuator assembly.

    Therefore, ABS motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.

(a) Turn the ignition switch off.

(b) Clear the DTCs (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

(f) Check if the same DTC is output (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

Result

Proceed to

DTC C1427 is not output.

A

DTC C1427 is 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 to ON and the stop light switch assembly off, the ECU performs self diagnosis of the motor circuit.
  • If the normal system code is output (No trouble codes 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.
A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE BRAKE ACTUATOR ASSEMBLY