- Stop light switch assembly
- Wire harness or connector
- Skid control ECU (brake actuator assembly)
- Brake actuator assembly (Master cylinder pressure sensor)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KEO |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1422; Master Cylinder Pressure Sensor Zero Point High Malfunction; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1422 |
Master Cylinder Pressure Sensor Zero Point High Malfunction |
DESCRIPTION
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1422 |
When vehicle speed is 3 km/h (2 mph) or more and stop light switch assembly is OFF, master cylinder pressure continuously exceeds 1.764 MPa (18.0 kgf/cm2, 255 psi) for 5 seconds or more. |
|
WIRING DIAGRAM
Refer to DTC C1425 (See page
![2018 - 2020 MY Sienna [11/2017 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1425; Open in Stop Light Switch Circuit](/t3Portal/stylegraphics/info.gif)
).
CAUTION / NOTICE / HINT
NOTICE:
-
When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page
).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Perform a road test.
(e) Check for DTCs (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1422 is output. |
A |
|
DTCs C1422 and C1425 are output. |
B |
| B |
|
|
|
2. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(e) Select the Data List using the Techstream (See page
).
ABS/VSC/TRAC
|
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 |
- |
(f) Check that the stop light condition observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays ON or OFF according to brake pedal operation.
| NG |
|
|
|
3. |
READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR) |
(a) Select the Data List using the Techstream (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Master Cylinder Pressure |
Master cylinder pressure sensor pressure / Min.: 0.00 MPa, Max.: 23.28 MPa |
Brake pedal depressed: Proportional to pedal force Brake pedal released: 0.00 to 1.76 MPa |
- |
OK:
Data List pressure is within standard range.
| NG |
|
|
|
4. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Perform a road test.
(e) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1422 is not output. |
A |
|
DTC C1422 is output. |
B |
| A |
|
| B |
|
|
5. |
CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION |
(a) Turn the ignition switch off.
(b) Check the brake pedal height and stop light switch installation (See page
).
OK:
The brake pedal height and stop light switch installation are normal.
| NG |
|
|
|
6. |
INSPECT STOP LIGHT SWITCH ASSEMBLY |
(a) Inspect the stop light switch assembly (See page
).
| NG |
|
|
|
7. |
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 connectors.
(c) Disconnect the 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 |
|---|---|---|
|
A75-35 (STP) - Body ground |
Stop light switch assembly on (Brake pedal depressed) |
8 to 14 V |
|
A75-35 (STP) - Body ground |
Stop light switch assembly off (Brake pedal released) |
Below 1.5 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly)) |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
|
|