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Active Skid Control System (Asc) - Lancer Evolution: Adjustments Mitsubishi Lancer X

Anti-Lock/traction Control 2 illustrations ~1127 words

DTC C123A: Abnormality in sensor calibration

CAUTIONIf there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines. Whenever the ECU is replaced, ensure that the CAN bus lines are normal. Do not drop the G and yaw rate sensor or subject it to a shock. When the G and yaw rate sensor is replaced, always perform the calibration to make ASC-ECU learn the neutral point. (Refer to IN THE EVENT OF A DISCHARGED BATTERY .) When the hydraulic unit (integrated with ASC-ECU) is replaced, always perform the calibration of steering wheel sensor, G and yaw rate sensor, brake fluid pressure sensor, cut valve, and inlet valve.(Refer to IN THE EVENT OF A DISCHARGED BATTERY , STEERING WHEEL SENSOR CALIBRATION , MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR CALIBRATION , and CALIBRATION OF CUT VALVE AND INLET VALVE .)

G AND YAW RATE SENSOR CALIBRATION

CAUTIONPrior to calibration, check that no G and yaw rate sensor-related diagnostic trouble codes are set.
CAUTIONAfter the following procedure is complete, carry out calibration to let the ASC-ECU learn the neutral position of the G and yaw rate sensor. G and yaw rate sensor replacement ASC-ECU replacement
  1. Park the vehicle on a level surface.
  2. Turn the ignition switch to the "LOCK" (OFF) position. CAUTION: Before connecting or disconnecting the scan tool, turn the ignition switch to the "LOCK" (OFF) position.
  3. Set the scan tool with the ignition "LOCK" (OFF).
  4. Turn the ignition switch to the ON position.
  5. Select the relevant system from the menu.
  6. Select "ABS/ASC/ASTC/WSS" from the system lists in "System select", and press "OK" button.
  7. Select "Special function" in "ABS/ASC/ASTC/WSS".
  8. Select "Sensor calibration" in "Special function".
  9. Select "G sensor calibration" from the selected item, and press "OK" button.
  10. The screen displays "G sensor calibration: The selected command will be executed. Are you sure? Caution: Please check the execution conditions." Then press "OK" button.
  11. "Execute: The command was executed." will be shown. Then press "OK" button.
  12. Select "Lateral/G sensor calibration" from the selected item, and press "OK" button.
  13. The screen displays "Lateral/G sensor calibration: The selected command will be executed. Are you sure? Caution: Please check execution conditions." Then press "OK" button.
  14. "Executed: The command was executed." will be shown. Then press "OK" button.
  15. Learning neutral point complete
  16. Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

STEERING WHEEL SENSOR CALIBRATION

CAUTIONAfter the next operation has been completed, carry out the following two operations: Front alignment Steering wheel sensor (column switch assembly) replacement, removal and installation ASC-ECU replacement Revise the neutral point which the steering wheel sensor stores. Reset the steering angle compensation value which the ASC-ECU stores.
CAUTIONPrior to calibration, check that no steering wheel sensor-related diagnostic trouble codes are set. If diagnostic trouble codes other than C121A have set, proceed to the relevant troubleshootings.
  1. Place the vehicle on a level surface with its road wheels in the straight ahead position.
  2. Turn the ignition switch "LOCK" (OFF) position. CAUTION: Before connecting or disconnecting the scan tool, turn the ignition switch to the "LOCK" (OFF) position.
  3. Set the scan tool with the ignition at "LOCK" (OFF).
  4. Turn the ignition switch "ON" position.
  5. Select the relevant system from the menu.
  6. Select "Steering angle sensor" from the system list in "System select", and press "OK" button.
  7. Select "Special function" under "Steering angle sensor".
  8. Select "SAS Calibration" under "Special function". NOTE: If the steering angle sensor neutral point has been learned, the display will show "If SAS needs re-calibration, execute SAS calibration after executing SAS initialization". If yes, press "OK" button.
  9. As "SAS initialization" is selected under "SAS Calibration", press "OK" button. NOTE: At this time, if the steering angle sensor neutral point has been learned, the display will show "Do you want to start? Note This operation will dear DTCs". Then, press "OK" button.
  10. The display should show "Completed." Press "OK" button.
  11. Press the OK button.
  12. The display should show "SAS Calibration: Do you want to start?". Then press the OK button. NOTE: Please execute after making a tire and a steering wheel straight.
  13. The display should show "Completed." Press "OK" button.
  14. Turn the ignition switch to "LOCK" (OFF) position, and then turn the ignition switch ON again.
  15. Select the relevant system from the menu.
  16. Select "ABS/ASC/ASTC/WSS" from the system list under "System select", and press "OK" button.
  17. Select "Special function" under "ABS/ASC/ASTC/WSS".
  18. Select "Sensor calibration" under "Special function".
  19. Select "SAS calibration" under "Sensor calibration", and press "OK" button.
  20. The screen displays "SAS calibration: The selected command will be executed. Are you sure? Caution: Confirm the execution conditions." Then press "OK" button.
  21. "Executed: The command was executed." will be shown. Then press "OK" button.
  22. Select "Diagnostic trouble code" under "ABS/ASC/ASTC/WSS". If the diagnostic trouble code "C2205 SAS internal failure (past trouble)" is set, clear it.
  23. Learning neutral point complete
  24. Turn the ignition switch to "LOCK" (OFF) position and then disconnect the scan tool.

MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR CALIBRATION

CAUTIONBefore performing the calibration, check that the wheel cylinder brake fluid pressure sensor-related diagnostic trouble code is not set. Always perform the calibration with the brake pedal released (stoplight switch is turned off). 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. Troubleshooting for diagnostic trouble code No. C123A 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

CAUTIONBefore 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. Always perform the calibration of cut valve and inlet valve with the brake pedal released (stoplight switch is turned off). 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. After the replacement of ASC-ECU, the calibration of cut valve and inlet valve must be performed with the new ASC-ECU. When the cut valve calibration is performed, the calibration of master cylinder fluid pressure sensor is also executed at the same time. When the cut valve calibration is not completed, the inlet valve calibration cannot be performed. After the completion of following works, always perform the calibration of cut valve and inlet valve. Diagnosis for the diagnostic trouble code No. C2002 is performed. 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". NOTE: The cut valve fluid pressure learning requires approximately 20 seconds.
  14. Among the selected items, select "Inlet valve fluid pressure," and then press the "OK" button.
  15. When a message "Inlet valve fluid pressure: Are you sure to execute the selected item? Caution: Check the execution conditions" is displayed, press the "OK" button.
  16. When a message "Command execution: Command has been executed" is displayed, press the "OK" button.
  17. Check that the message changes from "Under execution" to "Complete". NOTE: The inlet valve fluid pressure learning requires approximately 20 seconds.
  18. The valve fluid pressure learning is complete.
  19. Turn the ignition key to the LOCK (OFF) position, and then remove the scan tool from the vehicle.

Scheme 3

Scheme 3: REMOVAL AND INSTALLATION
Scheme 3: REMOVAL AND INSTALLATION

Scheme 4

Scheme 4: ASC OFF SWITCH CONTINUITY CHECK
Scheme 4: ASC OFF SWITCH CONTINUITY CHECK
  1. As shown in the figure, connect the circuit tester to the ASC OFF switch as a single unit.
  2. Check the continuity of when the ASC OFF switch is pressed and released. RESISTANCE SPECIFICATIONS Item ASC OFF switch is released (not operated) ASC OFF switch is pressed Continuity between terminal No. 1 and No. 2 No continuity Continuity exists (2ohms or less) Continuity between terminal No. 3 and No. 4 Continuity exists Continuity exists

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