READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER SENSOR)
CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH POWER SOURCE TERMINAL)
INSPECT STOP LIGHT SWITCH ASSEMBLY
DTC C1246/46 Master Cylinder Pressure Sensor Malfunction
Description
The master cylinder pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
DTC Code | DTC Detection Condition | Trouble Area |
C1246/46 | When any of the following conditions is detected: 1. All of the following conditions continue for at least 30 seconds.
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Inspection procedure
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- When replacing the master cylinder solenoid, perform zero point calibration .
1.CHECK DTC |
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Clear the DTC .
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Turn the ignition switch off.
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Start the engine.
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Depress the brake pedal.
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Check for DTC .
Result Result Proceed to DTC C1246/46 is output A DTCs C1246/46 and C1249/49 are output B
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A | |
2.READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER SENSOR) |
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Connect the intelligent tester to the DLC3.
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Turn the ignition switch to ON and turn the intelligent tester on.
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Enter the following menus: Chassis / ABS/VSC/TRC / Data List.
ABS/VSC/TRC 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 is released: 0.3 to 0.9 V The reading increases when the brake pedal is depressed.
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Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on the intelligent tester changes when depressing the brake pedal.
Result Result Proceed to Master cylinder pressure sensor value does not change LHD A RHD B Master cylinder pressure sensor value changes but it is not normal C Master cylinder pressure sensor value changes normally
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A | |
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3.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION |
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Check the brake pedal height (LHD:).
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Check the stop light switch installation (LHD:/RHD:).
OK:
The brake pedal and stop light switch are normal.
Result Result Proceed to OK A NG LHD B RHD C
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A | |
4.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH POWER SOURCE TERMINAL) |
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Disconnect the A30 stop light switch connector.
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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
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OK | |
5.INSPECT STOP LIGHT SWITCH ASSEMBLY |
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Remove the stop light switch assembly.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection Switch Condition Specified Condition 1 - 2 Switch pin free Below 1 ? Switch pin pushed in 10 k? or higher
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OK | |
6.RECONFIRM DTC |
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Clear the DTC .
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Check if the same DTC is output .
Result Result Proceed to DTC is not output A DTC is output LHD B RHD C
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A | |
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