Toyota Avalon Service & Repair Manual: Deceleration Sensor Internal Circuit (C1419,C1435)

DESCRIPTION

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

If an internal malfunction signal from the yaw rate and acceleration sensor (airbag ECU assembly) is detected by the skid control ECU (brake booster with master cylinder assembly), DTC C1419 and/or DTC C1435 is stored.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1419

Deceleration Sensor Internal Circuit

1137

Acceleration sensor internal malfunction signal is detected.

Acceleration sensor (airbag ECU assembly)

Comes on

  • INF Code 1137: SAE Code C0520 (Case 3)
  • ABS DTC

C1435

Yaw Rate Sensor Internal Circuit

711

712

Yaw rate sensor internal malfunction signal is detected.

Yaw rate sensor (airbag ECU assembly)

Does not come on

VSC DTC

MONITOR DESCRIPTION

C0520 (Case 3):
  • The acceleration sensor (airbag ECU assembly) detects a malfunction in an internal sensor (longitudinal G sensor or lateral G sensor) during self-diagnosis. When an abnormal acceleration sensor (airbag ECU assembly) data value is received via CAN communication, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration sensor (airbag ECU assembly) is malfunctioning and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

C0520 (Case 3)

Related DTCs

C0520 (Case 3): Acceleration sensor internal malfunction

Required Sensors/Components(Main)

Acceleration sensor (airbag ECU assembly)

Required Sensors/Components(Related)

Skid control ECU (brake booster with master cylinder assembly)

Frequency of Operation

Continuous

Duration

-

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

C0520 (Case 3)

Monitor runs whenever the following DTCs are not stored

None

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

Not detected

TYPICAL MALFUNCTION THRESHOLDS

C0520 (Case 3)

Either of the following conditions is met

-

Acceleration sensor 1 (longitudinal G) error (CAN communication data)

"1" (abnormality)

Acceleration sensor 2 (lateral G) error (CAN communication data)

"1" (abnormality)

COMPONENT OPERATING RANGE

C0520 (Case 3)

All of the following conditions are met

-

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

Not detected

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

"0" (valid)

Acceleration sensor 1 (longitudinal G) error (CAN communication data)

"0" (no abnormality)

Acceleration sensor 2 (lateral G) error (CAN communication data)

"0" (no abnormality)

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.

REPLACE AIRBAG ECU ASSEMBLY

(a) Replace the yaw rate and acceleration sensor (airbag ECU assembly).

Click here

NEXT

END

    IG1 Voltage Supply too High (C1417,C14DF)

    Malfunction in Deceleration Sensor (C1420)

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