Lancer Evolution L4-2.0L Turbo (4B11T/C) (2010)
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Brake Fluid Pressure Sensor/Switch: Service and Repair
MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR CALIBRATION
CAUTION:
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Before performing the calibration, check that the wheel cylinder brake fluid pressure sensor-related diagnostic trouble code is not set.
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Always perform the calibration with the brake pedal released (stoplight switch is turned off).
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After the operation below is completed, perform the calibration to make ASC-ECU to learn the neutral point of the wheel cylinder brake
fluid pressure sensor.
1. Troubleshooting for diagnostic trouble code No. C123A
2. ASC-ECU replacement
1. Park the vehicle on a level surface.
2. Turn the ignition key to the ON position.
3. Turn the ignition key to the LOCK (OFF) position.
CAUTION:
Before connecting or disconnecting scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position.
4. Check that the ignition key is in the LOCK (OFF) position, and then set scan tool MB991958.
5. Turn the ignition switch to the ON position.
6. On the Menu, select "System selection."
7. On the "System selection," select "ABS/ASC/ASTC/WSS" in the system list, and then click the "OK" button.
8. Select "Special function" in the "ABS/ASC/ASTC/WSS" field.
9. In the "Special function," select "Learn sensor neutral position."
10. Among the selected items, select "Learn M/C pressure sensor neutral position," and then press the "OK" button.
11. When a message "Learn M/C pressure sensor neutral position: Are you sure to execute the selected item? Caution: Check the execution
conditions" is displayed, press the "OK" button.
12. When a message "Command execution: Command has been executed" is displayed, press the "OK" button.
13. The neutral point is learned.
14. Turn the ignition key to the LOCK (OFF) position, and then remove the scan tool from the vehicle.
Calibration of cut valve and inlet valve
CAUTION:
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Before the calibration work of the cut valve and inlet valve, check that no diagnostic trouble code is set relating to the cut valve, inlet
valve, motor system, power supply system, or ECU system.
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Always perform the calibration of cut valve and inlet valve with the brake pedal released (stoplight switch is turned off).
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If any diagnostic trouble code other than No. C2002 is also set, always perform the diagnosis of the diagnostic trouble code other than No.
C2002 first.
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After the replacement of ASC-ECU, the calibration of cut valve and inlet valve must be performed with the new ASC-ECU.
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When the cut valve calibration is performed, the calibration of master cylinder fluid pressure sensor is also executed at the same time.
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When the cut valve calibration is not completed, the inlet valve calibration cannot be performed.
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After the completion of following works, always perform the calibration of cut valve and inlet valve.
1. Diagnosis for the diagnostic trouble code No. C2002 is performed.
2. ASC-ECU replacement
1. Park the vehicle on a level surface.
2. Turn the ignition key to the ON position.
3. Turn the ignition key to the LOCK (OFF) position.
CAUTION:
Before connecting or disconnecting scan tool, always turn the ignition switch to the LOCK (OFF) position.
4. Check that the ignition key is in the LOCK (OFF) position, and then set scan tool.
5. Turn the ignition switch to the ON position.
6. On the Menu, select "System selection."
7. On the "System selection," select "ABS/ASC/ASTC/WSS" in the system list, and then click the "OK" button.
8. Select "Special function" in the "ABS/ASC/ASTC/WSS" field.
9. In the "Special function," select "Learn valve fluid pressure."
10. Among the selected items, select "Cut valve fluid pressure," and then press the "OK" button.
11. When a message "Cut valve fluid pressure: Are you sure to execute the selected item? Caution: Check the execution conditions" is displayed, press
the "OK" button.
12. When a message "Command execution: Command has been executed" is displayed, press the "OK" button.
13. Check that the message changes from "Under execution" to "Complete."
