| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AZ8J |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - 08/2021] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): C1246; Master Cylinder Pressure Sensor; 2019 - 2021 MY Avalon [04/2018 - 08/2021] | ||
|
DTC |
C1246 |
Master Cylinder Pressure Sensor |
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 |
Any of the following is detected:
|
|
DTC Detection Conditions: C1246
|
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
Refer to DTC C1249.
Click here
![2019 - 2021 MY Avalon [04/2018 - 08/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): C1249; Open Circuit in Stop Light Switch Circuit](/t3Portal/stylegraphics/info.gif)
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (BS1 VOLTAGE VALUE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
BS1 Voltage Value |
+BS voltage value |
Min.: 0.00 V, Max.: 20.00 V |
- |
Changes in proportion to battery voltage |
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
|---|
|
BS1 Voltage Value |
(d) Take a note of the +BS voltage value.
HINT:
The noted +BS voltage value is used in a later step.
|
|
2. |
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) for Gasoline Model with Cornering Light: Click here
for Gasoline Model without Cornering Light: Click here
|
|
|
3. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Stop Light SW |
Stop light switch assembly |
ON or OFF |
ON: Brake pedal depressed OFF: Brake pedal released |
- |
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
|---|
|
Stop Light SW |
(d) Check that the stop light switch assembly display observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays on or off according to brake pedal operation.
| NG |
|
|
|
4. |
READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR) |
(a) Start the engine.
(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
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 |
Brake pedal released: 0.20 to 0.40 V |
Reading increases when brake pedal is depressed |
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
|---|
|
Master Cylinder Sensor |
(c) 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 brake pedal is depressed, the voltage displayed on the Techstream increases.
| NG |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs.
Chassis > ABS/VSC/TRAC/EPB > Clear DTCs
(b) Turn the engine switch off.
(c) Start the engine.
(d) Drive the vehicle and depress the brake pedal several times to test the stop light circuit.
(e) Check if the same DTC is output.
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
C1246 is not output |
A |
|
C1246 is output |
B |
| A |
|
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
6. |
CHECK HARNESS AND CONNECTOR (STP TERMINAL) |
|
(a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A28-42 (STP) - Body ground |
Stop light switch assembly on (Brake pedal depressed) |
(+BS x 0.85) to 14 V* |
|
A28-42 (STP) - Body ground |
Stop light switch assembly off (Brake pedal released) |
Below 1.5 V |
HINT:
*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.
| OK |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
|
|