Toyota Tacoma 2015-2018 Service Manual: 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
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.
(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
|
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.
A |
|
USE SIMULATION METHOD TO CHECK
|
B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
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 ...
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:
Operation Check
OPERATION CHECK
1. NOTICE WHEN CHECKING THE FOLLOWING
(a) Wireless door lock/unlock function:
This wireless door lock control function operates only when the following 3 conditions
are met:
(1) There is no key in the ignition key cylinder.
(2) All doors are closed.
(3) The power door lock sy ...
Short in Front Passenger Side Knee Airbag Squib Circuit (B1865/65-B1868/65)
DESCRIPTION
The passenger side knee airbag squib circuit consists of the airbag sensor assembly
and lower No. 2 instrument panel airbag assembly.
The airbag sensor assembly uses this circuit to deploy the airbag when deployment
conditions are met. These DTCs are stored when a malfunction is de ...
Steering Angle Sensor Output Malfunction (C1434)
DESCRIPTION
Steering angle sensor signals are input to the skid control ECU (brake actuator
assembly) via the CAN communication system.
HINT:
When a malfunction occurs in the communication line to the steering angle sensor,
U0126 is output. If a DTC related to the CAN communication line is ou ...