- Brake actuator assembly (ground circuit)
- Brake actuator assembly (motor circuit)
- Wire harness or connector
| 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. |
|
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](/t3Portal/stylegraphics/info.gif)
).
- 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
).
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 |
|
|
|
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) |
|
|
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
).
(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
).
|
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 |
|
| B |
|
|
|