DESCRIPTION
The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C1246 |
Master Cylinder Pressure Sensor Malfunction |
Any of the following is detected:
|
|
Vehicle Condition |
||||
---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
||
Diagnosis Condition |
- |
- |
- |
- |
Malfunction Status |
The voltage of the sensor signal is out of range (below 0.129 V, above 3.29 V). |
○ |
- |
- |
An abnormality is detected in the skid control ECU internal sensor test. |
- |
○ |
- |
|
The sensor signal offset value is out of range. |
- |
- |
○ |
|
Detection Time |
- |
- |
- |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform system variant learning.
Click here
PROCEDURE
1. |
CHECK STOP LIGHT OPERATION |
(a) Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.
OK:
Condition |
Illumination Condition |
---|---|
Brake pedal depressed. |
On |
Brake pedal released. |
Off |
NG |
INSPECT LIGHTING SYSTEM (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 using the Techstream.
Click here
Chassis > ABS/VSC/TRAC/EPB > Data List
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|---|
Master Cylinder Sensor |
Master cylinder pressure sensor reading |
Min.: 0.00 V, Max.: 5.00 V |
When brake pedal released: 0.2 to 0.4 V |
Reading increases when brake pedal is depressed |
Tester Display |
---|
Master Cylinder Sensor |
(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, the voltage displayed on the Techstream increases.
NG |
REPLACE BRAKE ACTUATOR ASSEMBLY |
|
3. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Select the Data List using the Techstream.
Click here
Chassis > ABS/VSC/TRAC/EPB > Data List
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 |
- |
Tester Display |
---|
Stop Light SW |
(d) Check that the stop light switch display observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays ON or OFF according to brake pedal operation.
NG |
GO TO STEP 5 |
|
4. |
RECONFIRM DTC |
(a) Turn the ignition switch off.
(b) Clear the DTCs.
Click here
Chassis > ABS/VSC/TRAC/EPB > Clear DTCs(c) Turn the ignition switch off.
(d) Start the engine.
(e) Drive the vehicle and depress the brake pedal several times to test the stop light circuit.
(f) Check if the same DTC is output.
Click here
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
Result |
Proceed to |
---|---|
DTC C1246 is not output. |
A |
DTC C1246 is output. |
B |
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
Click here
A |
USE SIMULATION METHOD TO CHECK |
B |
REPLACE BRAKE ACTUATOR ASSEMBLY |
5. |
CHECK HARNESS AND CONNECTOR (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 A42 skid control ECU (brake actuator assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A42-44 (STP2) - Body ground |
Stop light switch ON (Brake pedal depressed) |
11 to 14 V* |
A42-44 (STP2) - Body ground |
Stop light switch OFF (Brake pedal released) |
Below 1.5 V |
HINT:
*: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
Click here
OK |
REPLACE BRAKE ACTUATOR ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
Toyota CH-R Owners Manual > Steps to take in an emergency: If your vehicle needs to be towed
If towing is necessary, we recommend having your vehicle towed by
your Toyota dealer or commercial towing service, using a wheel-lift type truck or
flatbed truck.
Use a safety chain system for all towing, and abide by all state/
provincial and local laws.
Situations when it is necessary to ...
Toyota CH-R Service Manual > Id Code Box: Installation
INSTALLATION
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the ID code box (immobiliser code ECU), refer to Registration.
Click here
PROCEDURE
1. INSTALL ID CODE BOX (IMMOBILISER CODE ECU)
(a) Engage the guides to install the ID code box (immobiliser code ECU) as shown
in the illustrat ...