Toyota Avalon Service & Repair Manual: Invalid Data Received from Deceleration Sensor (C1442,C1443)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

The skid control ECU (brake booster with master cylinder assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly) via the CAN communication system.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1442

Invalid Data Received from Deceleration Sensor

572

When voltage at terminal IG1 is 9.54 V or more, sensor invalid information received from acceleration sensor is ON continuously for 10 seconds or more.

  • Acceleration sensor (airbag ECU assembly)
  • Acceleration sensor (airbag ECU assembly) installed improperly

Comes on

  • INF Code 572: SAE Code C051E
  • ABS DTC

C1443

Invalid Data Received from Yaw Rate Sensor

715

When voltage at terminal IG1 is 9.54 V or more, sensor invalid information received from yaw rate sensor is ON continuously for 10 seconds or more.

  • Yaw rate sensor (airbag ECU assembly)
  • Yaw rate sensor (airbag ECU assembly) installed improperly

Does not come on

VSC DTC

MONITOR DESCRIPTION

C051E:
  • The acceleration sensor (airbag ECU assembly) detects whether the sensor value is valid or invalid during self-diagnosis. When an invalid acceleration sensor (airbag ECU assembly) value is received for a certain amount of time, the skid control ECU (brake booster with master cylinder assembly) judges that the data from the acceleration sensor (airbag ECU assembly) is invalid and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C051E: Acceleration sensor intermittent/erratic

Required Sensors/Components(Main)

Acceleration sensor (airbag ECU assembly)

Required Sensors/Components(Related)

Skid control ECU (brake booster with master cylinder assembly)

Yaw rate and acceleration sensor (airbag ECU assembly)

Frequency of Operation

Continuous

Duration

10 seconds

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

C051E

Monitor runs whenever the following DTCs are not stored

C051C (Case 1) (Acceleration sensor range/performance)

C051C (Case 2) (Acceleration sensor range/performance)

C051C (Case 3) (Acceleration sensor range/performance)

C051C (Case 4) (Acceleration sensor range/performance)

C0520 (Case 1) (Acceleration sensor 2 out of range)

C0520 (Case 2) (Acceleration sensor 1 and acceleration sensor 2 out of range)

C0520 (Case 3) (Acceleration sensor internal malfunction)

All of the following conditions are met

-

Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)

Not detected

IG1 voltage

Higher than 9.54 V

Acceleration sensor fail (C051C, C0520)

Not detected

Yaw rate and acceleration sensor power supply voltage (IG) invalidation/validation (CAN communication data)

"0" (Valid)

TYPICAL MALFUNCTION THRESHOLDS

C051E

Either of the following conditions is met

-

Acceleration sensor (longitudinal G) invalidation/validation (CAN communication data)

"1" (Invalid)

Acceleration sensor (lateral G) invalidation/validation (CAN communication data)

"1" (Invalid)

COMPONENT OPERATING RANGE

C051E

All of the following conditions are met

-

Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)

Not detected

Acceleration sensor (longitudinal G) invalidation/validation (CAN communication data)

"0" (Valid)

Acceleration sensor (lateral G) invalidation/validation (CAN communication data)

"0" (Valid)

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 (IG).
  7. Turn the Techstream on.
  8. Wait 10 seconds.
  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.

CAUTION / NOTICE / HINT

NOTICE:

After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

Click here

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

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

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTCs C1442 and C1443 are not output.

A

DTCs C1442 and/or C1443 are output.

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG ECU ASSEMBLY

    Steering Angle Sensor Unusual Bank Angle Detected (C1440)

    Motor Drive Permission Malfunction (C1451)

    See More:

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