Toyota Tacoma (2015-2018) Service Manual: SM Solenoid Circuit (C1225,C1468,C1469,C146A,C146B)

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / SM Solenoid Circuit (C1225,C1468,C1469,C146A,C146B)

DESCRIPTION

These solenoids turn on when signals are received from the skid control ECU (brake actuator assembly) and they control the pressure acting on the wheel cylinders to control the braking force.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1225	SM Solenoid Circuit	Any of the following is detected: While master cylinder cut solenoid outputs ON, overcurrent continues for 0.1 seconds or more. While master cylinder cut solenoid outputs OFF, open circuit continues for 0.05 seconds or more. While master cylinder cut solenoid outputs ON, open circuit continues for 0.05 seconds or more. While master cylinder cut solenoid outputs OFF, current is maintained for 0.05 seconds or more. Difference in master cylinder cut solenoid output accuracy continues for 0.2 seconds or more.	Brake actuator assembly
C1468	SFR Solenoid Circuit	Any of the following is detected: Open or short circuit in decompression solenoid continues for 0.05 seconds or more. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.	Brake actuator assembly
C1469	SFL Solenoid Circuit	Any of the following is detected: Open or short circuit in decompression solenoid continues for 0.05 seconds or more. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.	Brake actuator assembly
C146A	SRR Solenoid Circuit	Any of the following is detected: Open or short circuit in decompression solenoid continues for 0.05 seconds or more. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.	Brake actuator assembly
C146B	SRL Solenoid Circuit	Any of the following is detected: Open or short circuit in decompression solenoid continues for 0.05 seconds or more. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.	Brake actuator assembly

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page PROCEDURE ).

PROCEDURE

1.	RECONFIRM DTC

HINT:

These codes are detected when a problem is determined in the skid control ECU (brake actuator assembly).

The solenoid circuits are in the skid control ECU (brake actuator assembly).

Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if any DTCs are output before replacing the skid control ECU (brake actuator assembly).

(a) Clear the DTC (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(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 ).

Result

Result	Proceed to
DTC is not output	A
DTC 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 off, the ECU performs self diagnosis of the motor and solenoid circuits.
If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly). Make sure that no DTCs are output.
If any DTCs are output while jiggling a connector or wire harness from the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
The DTCs were probably output due to a bad connection of the connector terminal.

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)

DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system. The airbag sensor ...

Engine Control System Malfunction (C1201)

DESCRIPTION If a malfunction in the engine control system is detected, VSC and TRAC operations are prohibited by the fail-safe function. DTC No. Detection Item DTC ...

Other materials:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT SPEEDOMETER (a) Check speedometer operation. NOTICE: The meter ECU receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following inspection referring to values on the Data List of th ...

Accumulator Low Pressure (C1452)
DESCRIPTION DTC Code DTC Detection Condition Trouble Area C1452 After braking, the fluid pressure inside the accumulator is below the threshold within 3.2 seconds. Hydraulic circuit Accumulator pressure sen ...

Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1275,...,C1414)
DESCRIPTION Refer to DTCs C1401 and C1402 (See page ). DTC Code DTC Detection Condition Trouble Area C1275 C1276 Stored only during test mode. Front speed sensor RH/LH Front speed sensor rotor RH/LH (Front ...