Toyota Avalon Service & Repair Manual: Malfunction in Deceleration Sensor (C1420)

Toyota Avalon Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / Malfunction in Deceleration Sensor (C1420)

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 CAN communication.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1420

Malfunction in Deceleration Sensor

571

After the difference between GL1 and GL2 is 0.6 G or more with the vehicle stopped, the difference between GL1 and GL2 does not drop below 0.4 G or more for 60 seconds or more.
  • Acceleration sensor (airbag ECU assembly) installed improperly
  • Acceleration sensor (airbag ECU assembly)

Does not come on

ABS DTC

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 AIRBAG ECU ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.

Click here

OK:

The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

    Deceleration Sensor Internal Circuit (C1419,C1435)

    Open in Stop Switch Circuit (C1425,P0573)

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