DESCRIPTION
Master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.
DTC C1281/81 will be cleared when the master cylinder pressure sensor sends a master cylinder pressure signal or when Test Mode ends. DTC C1281/81 is output only in Test Mode.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1246/46 |
Any of the following is detected:
|
|
C1281/81 |
Detected only during Test Mode. |
|
WIRING DIAGRAM
Refer to DTC C1249/49 (See page ).
PROCEDURE
1. |
CHECK STOP LIGHT OPERATION |
(a) Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.
OK:
Condition |
Illumination Condition |
---|---|
Brake pedal depressed |
ON |
Brake pedal released |
OFF |
NG |
INSPECT STOP LIGHT CIRCUIT |
|
2. |
READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Select the Data List on the Techstream (See page ).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Master Cylinder Sensor |
Master cylinder pressure sensor reading / Min.: 0 V, Max.: 5 V |
Brake pedal released: 0.3 to 0.9 V |
Reading increases when brake pedal is depressed |
(d) Check that the brake fluid pressure value of the master cylinder pressure sensor observed on the Techstream changes when the brake pedal is depressed.
OK:
When the pedal is depressed, voltage displayed on the Techstream increases.
NG |
REPLACE BRAKE ACTUATOR ASSEMBLY |
|
3. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) |
(a) Select the Data List on the Techstream (See page ).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Stop Light SW |
Stop light switch / ON or OFF |
ON: Brake pedal depressed OFF: Brake pedal released |
- |
(b) Check that the stop light condition observed on the Techstream changes when the brake pedal is depressed.
OK:
When the brake pedal is depressed, the Techstream displays "ON".
NG |
GO TO STEP 5 |
|
4. |
RECONFIRM DTC |
(a) Turn the ignition switch off.
(b) Clear the DTCs (See page ).
(c) Start the engine.
(d) At a speed of 30 km/h (18 mph) or more, drive the vehicle and perform braking test (decelerate the vehicle by depressing the brake pedal).
(e) Check if the same DTC is recorded (See page ).
Result |
Proceed to |
---|---|
DTC (C1246/46) is not output |
A |
DTC (C1246/46) is output |
B |
A |
CHECK FOR INTERMITTENT PROBLEMS |
B |
REPLACE BRAKE ACTUATOR ASSEMBLY |
5. |
INSPECT SKID CONTROL ECU (STP 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 connector.
(c) Disconnect the skid control ECU connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A42-30 (STP) - Body ground |
Stop light switch ON (Brake pedal depressed) |
8 to 14 V |
A42-30 (STP) - Body ground |
Stop light switch OFF (Brake pedal released) |
Below 1.5 V |
*1 |
Front view of wire harness connector (to Brake Actuator (Skid Control ECU)) |
OK |
REPLACE BRAKE ACTUATOR ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
Lost Communication with Clearance Warning ECU (U1110)
DESCRIPTION
DTC Code
DTC Detection Condition
Trouble Area
U1110
No communication from the clearance warning ECU assembly continues.
Clearance warning ECU assembly branch wire o ...
Lost Communication with ECM / PCM (U0100)
DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
U0100
No communication from the ECM continues.
ECM main wire or connector
Power source circuit of ECM
ECM
...
Steering Lock Motor Drive Power Circuit
DESCRIPTION
The steering lock ECU (steering lock actuator assembly) is connected to the power
management control ECU. The steering lock ECU (steering lock actuator assembly)
cannot activate the motor unless it receives permission signals from both ECUs.
...