-
Both of the following conditions continue for 0.2 seconds or more.
- The IG1 terminal voltage is 9.5 V or more.
- The solenoid relay contact is open when the relay is ON.
-
Both of the following conditions continue for 0.2 seconds or more.
- The IG1 terminal voltage becomes lower than 9.5 V when the relay is turned on.
- The relay contact remains open.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIVN |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C0278,C0279; Open in ABS Solenoid Relay Circuit; 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C0278 |
Open in ABS Solenoid Relay Circuit |
|
DTC |
C0279 |
Short in ABS Solenoid Relay Circuit |
DESCRIPTION
The ABS solenoid relay supplies power to the ABS solenoid and TRAC solenoid.
The solenoid relay is turned on 1.5 seconds after the ignition switch is turned to ON, and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running.
The ABS solenoid relay is housed in the skid control ECU in the actuator assembly.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C0278 |
Either of the following is detected: |
|
|
C0279 |
Immediately after the ignition switch is turned to ON, the solenoid relay contact is closed for 4 seconds when the relay is turned off. |
|
WIRING DIAGRAM
Refer to DTCs C0226, C0236, C0246, C0256 and C1225 (See page
![2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C0226,C0236,C0246,C0256,C1225; SFR Solenoid Circuit+](/t3Portal/stylegraphics/info.gif)
).
CAUTION / NOTICE / HINT
NOTICE:
-
When replacing the brake actuator assembly, perform zero point calibration and store system information (See page
).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
When DTC C1241 and/or C1417 is output together with DTC C0278 and/or C0279, inspect and repair the trouble areas indicated by DTC C1241 and/or C1417 first (See page
, or
).
PROCEDURE
|
1. |
INSPECT SKID CONTROL ECU (+BS TERMINAL) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(b) Disconnect the skid control ECU connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-12 (+BS) - Body ground |
Always |
11 to 14 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Skid Control ECU) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT) |
|
|
2. |
INSPECT SKID CONTROL ECU (GND1 TERMINAL) |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
Text in Illustration
|
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) |
|
|
3. |
RECONFIRM DTC |
HINT:
This code is detected when a problem is identified in the brake actuator assembly.
The solenoid circuit is in the brake actuator assembly.
Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.
(a) Reconnect the skid control ECU connector.
(b) Clear the DTCs (See page
).
(c) Start the engine.
(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.
(e) Check if the same DTC is recorded (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTCs (C0278 and C0279) are not output |
A |
|
DTCs (C0278 and/or C0279) are output |
B |
HINT:
- If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the ignition switch to ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
- If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
- If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.
- The DTCs were possibly output due to a bad connection of the connector terminal.
| A |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
| B |
|
|
|