Dtc C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING GTS (STOP LIGHT SW)
CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION
RECONFIRM DTC
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH POWER SOURCE TERMINAL)
INSPECT STOP LIGHT SWITCH
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
DTC C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction
DTC C1456 Control Pressure Sensor Zero Point High
DESCRIPTION
Refer to DTCs C1421, C1423, C1424, C1455, C1457 and C1458 ().
| DTC Code | DTC Detection Condition | Trouble Area |
| C1422 | When the stop light switch is off, the PM/C1 terminal voltage is 0.86 V or higher for 5 seconds or more. | STOP fuse
Stop light switch assembly
Stop light switch circuit
Master cylinder pressure sensor circuit
Master cylinder solenoid (Master cylinder pressure sensor)
|
| C1456 | When the stop light switch is off, the PCTRL terminal voltage is 0.86 V or higher for 5 seconds or more. | STOP fuse
Stop light switch
Stop light switch circuit
Pressure control sensor circuit
Master cylinder solenoid (Pressure control sensor)
|
WIRING DIAGRAM
Refer to DTC C1380 ().
INSPECTION PROCEDURE
After replacing the master cylinder solenoid, perform zero point calibration and store the system information ().
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.READ VALUE USING GTS (STOP LIGHT SW)
|
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List.
ABS/VSC/TRC| 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 | - |
Check that the stop light switch condition observed on the GTS changes according to brake pedal operation.
- OK:
- The GTS displays ON and OFF according to brake pedal operation.
| 2.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION |
Turn the ignition switch off.
Check the brake pedal height and stop light switch installation (for LHD: , for RHD: ).
- OK:
- The brake pedal height and stop light switch installation are normal.
| | ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH |
|
|
Turn the ignition switch off.
Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform a braking test (decelerate the vehicle by depressing the brake pedal).
Check if the same DTC is output ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output (for LHD) | B |
| DTC is output (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
| |
| CHECK FOR INTERMITTENT PROBLEMS ()
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| 4.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH POWER SOURCE TERMINAL) |
Make sure that there is no looseness in the locking part and connecting part of the connectors.
Disconnect the stop light switch assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A30-2 - Body ground | Always | 11 to 14 V |
Text in Illustration| *a | Front view of wire harness connector
(to Stop Light Switch Assembly) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.INSPECT STOP LIGHT SWITCH |
Remove the stop light switch assembly ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| 1 - 2 | Switch pin not pushed in | Below 1 Ω |
| Switch pin pushed in | 10 kΩ or higher |
Text in Illustration| *a | Component without harness connected
(Stop Light Switch Assembly) |
| | REPLACE STOP LIGHT SWITCH ASSEMBLY ()
|
|
|
| 6.CHECK HARNESS AND CONNECTOR (STP TERMINAL)
|
Turn the ignition switch off.
Disconnect the skid control ECU (master cylinder solenoid) connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A24-7 (STP) - Body ground | Brake pedal depressed | 8 to 14 V |
| Brake pedal released | Below 1.5 V |
Text in Illustration| *a | Front view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid]) |
Result| Result | Proceed to |
| NG | A |
| OK (for LHD) | B |
| OK (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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