Toyota Avalon (XX50): Motor Drive Permission Malfunction (C1451). Calibration. Check For Intermittent Problems

Motor Drive Permission Malfunction (C1451)

DESCRIPTION

If air bleeding has not been performed, the skid control ECU (brake booster with master cylinder assembly) stores DTC C1451 to prevent the entry of air due to pump motor operation.

DTC C1451 is stored when Motor Invalid is selected, the system will not return to normal until the air bleeding procedure is performed.

MONITOR DESCRIPTION

• After replacing the skid control ECU (brake booster with master cylinder assembly) or brake booster pump assembly, if air bleeding is not performed and the vehicle is driven at a certain speed or more, the skid control ECU (brake booster with master cylinder assembly) judges that air bleeding has not been completed and illuminates the MIL and stores this DTC.

  Furthermore, this DTC is not cleared until air bleeding has been completed.

• After replacing the skid control ECU (brake booster with master cylinder assembly) or brake booster pump assembly, if air bleeding is not performed, the skid control ECU (brake booster with master cylinder assembly) judges that air bleeding has not been completed and illuminates the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights, blinks* the brake hold operated indicator light and stores this DTC.

  Furthermore, this DTC is not cleared until air bleeding has been completed.

  HINT:

  • *: The brake hold switch (electric parking brake switch assembly) is turned on under the following vehicle conditions.
    • Vehicle Conditions:
      1. The driver side door is closed.
      2. The driver side seat belt is fastened.
  • As the detection conditions slightly differ from SAE code C1451, the detection conditions for DTC C1451 (INF code 1152) is also provided.

MONITOR STRATEGY

HINT:

SAE code only.

TYPICAL ENABLING CONDITIONS

HINT:

SAE code only.

TYPICAL MALFUNCTION THRESHOLDS

HINT:

SAE code only.

COMPONENT OPERATING RANGE

HINT:

SAE code only.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the power switch off.
6. Turn the power switch on (READY).
7. Turn the Techstream on.
8. Drive the vehicle at a speed of 40 km/h (25 mph) or more for 1 second.
9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
10. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
11. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTCs are output, the system is normal.

PROCEDURE

(a) Bleed the air from the brake system.

Click here

HINT:

If air bleeding has been performed, this DTC will be cleared.

NEXT

(a) Check if the same DTC is output.

Click here

A

PERFORM AIR BLEEDING AGAIN

B

END

Calibration

CALIBRATION

DESCRIPTION

(a) After replacing any VSC related components or performing wheel alignment adjustment, clear and read the sensor calibration data.

Refer to the table below and then perform the necessary operation according to the part to be replaced in order to perform calibration.

NOTICE:

Yaw rate and acceleration sensor zero point calibration cannot be performed again until the data stored during zero point calibration has been cleared. After replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing data stored during previous zero point calibration.

OBTAIN ZERO POINT OF YAW RATE AND ACCELERATION SENSOR

NOTICE:

• After replacing the skid control ECU (brake booster with master cylinder assembly) or yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously learned data.
• While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it.
• Be sure to perform this procedure on a level surface (with an inclination of less than 0.25 degrees).
• While obtaining the zero point, make sure the tire pressure is as specified and the vehicle is in full contact with the ground (not lifted up or loaded).

HINT:

• After replacing the skid control ECU (brake booster with master cylinder assembly), brake pedal stroke sensor assembly, brake pedal or brake actuator assembly, yaw rate and acceleration sensor zero point calibration is automatically performed during the linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration or system information memorization.
• When entering Test Mode, the skid control ECU (brake booster with master cylinder assembly) communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode.

(a) Clear the zero point calibration data.

(1) Turn the power switch off.

(2) Check that the steering wheel is centered.

(3) Check that the shift lever is in P.

NOTICE:

When attempting to clear the data stored during zero point calibration with the shift lever not in P, the data stored during zero point calibration may not be cleared successfully.

(4) Connect the Techstream to the DLC3.

(5) Turn the power switch on (IG).

(6) Turn the Techstream on.

(7) Select the skid control ECU (brake booster with master cylinder assembly) to clear the zero point calibration data using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Reset Memory.

NOTICE:

Make sure to perform linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization after performing "Reset Memory" as the data stored during linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization is cleared.

(8) Turn the power switch off.

NOTICE:

If the power switch is turned on (IG) for more than 15 seconds with the shift lever in P after the zero point of the yaw rate and acceleration sensor has been cleared, only the zero point of the yaw rate sensor will be stored. If the vehicle is driven under these conditions, the skid control ECU (brake booster with master cylinder assembly) will store the zero point calibration for the acceleration sensor as not being completed. The skid control ECU (brake booster with master cylinder assembly) will then also indicate this as a malfunction of the VSC system using the indicator light.

(b) Perform zero point calibration of the yaw rate and acceleration sensor.

(1) Turn the power switch off.

(2) Check that the steering wheel is centered.

(3) Check that the shift lever is in P.

NOTICE:

DTCs C1210 (Zero Point Calibration of Yaw Rate Sensor Undone) and C1336 (Zero Point Calibration of Acceleration Sensor Undone) will be stored if the shift lever not in P.

(4) Connect the Techstream to the DLC3.

(5) Turn the power switch on (IG).

(6) Turn the Techstream on.

(7) Switch the skid control ECU (brake booster with master cylinder assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Test Mode.

(8) After Test Mode has been entered, keep the vehicle stationary on a level surface for 5 seconds or more.

HINT:

Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U1104 may be stored. If DTC U1104 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs.

(9) Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.

NOTICE:

• If Test Mode is entered with the shift lever not in P, the yaw rate and acceleration sensor zero point calibration will not be completed and a DTC will be stored.
• If a yaw rate and acceleration sensor zero point calibration not complete DTC is output, clear the data stored during the previous yaw rate and acceleration sensor zero point calibration and perform the calibration again.

HINT:

• Zero point calibration is performed only once after the system enters Test Mode.
• After the zero point calibration is complete, the slip indicator light indicates that the system is in Test Mode (blinks at 0.25 second intervals).

(10) Turn the power switch off and disconnect the Techstream.

Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS

HINT:

A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the Data List function of the Techstream.

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions should be monitored.

HINT:

• A momentary interruption (open circuit) cannot be detected for 3 seconds after the power switch is turned on (IG) (initial check).
• If Error remains displayed for one of the items on the Techstream, check for continuity between the ECU and the item for which Error is displayed.
• If a momentary interruption occurs and Error is displayed on the Techstream, Error will remain displayed on the Techstream for 1 second after the circuit returns to normal.

(f) While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors, or between ECUs.

OK:

Normal is displayed.

HINT:

If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.