- Stop light switch
- Stop light switch circuit
- Master cylinder pressure sensor circuit
- Brake actuator assembly (Master cylinder pressure sensor)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIWB |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1422; Master Cylinder Pressure Sensor Zero Point High Malfunction; 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C1422 |
Master Cylinder Pressure Sensor Zero Point High Malfunction |
DESCRIPTION
The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1422 |
When the stop light switch is OFF, the PMC terminal voltage is more than 0.86 V for 5 seconds or more. |
|
WIRING DIAGRAM
Refer to DTC C1425 (See page
![2016 - 2017 MY Sienna [12/2015 - 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 brake actuator assembly, perform zero point calibration and store system information (See page
).
HINT:
When DTC C1425 and/or C1426 is output together with DTC C1422, inspect and repair the trouble areas indicated by DTC C1425 and/or C1426 first (See page
, or
).
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 STOP LIGHT CIRCUIT (See page
|
|
|
2. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) |
(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 on the Techstream (See page
).
ABS/VSC/TRAC
|
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 |
- |
(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. |
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 |
|
|
|
4. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Start the engine.
(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform braking test (decelerate the vehicle by depressing the brake pedal).
(d) Check if the same DTC is recorded (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC (C1422) is not output |
A |
|
DTC (C1422) is output |
B |
| A |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
| B |
|
|
5. |
INSPECT SKID CONTROL ECU (STP1 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 connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A4-2 (STP1) - Body ground |
Stop light switch ON (Brake pedal depressed) |
8 to 14 V |
|
A4-2 (STP1) - Body ground |
Stop light switch OFF (Brake pedal released) |
Below 1.5 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Skid Control ECU) |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) |
|
|