Toyota Avalon Service & Repair Manual: Deceleration Sensor (C1232,C1243,C1245)

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.

HINT:

When a malfunction occurs in the communication line to the yaw rate and acceleration sensor (airbag ECU assembly), U0124 (Lost Communication With Lateral Acceleration Sensor Module) is output.

If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.

A DTC may be stored if either of the following is detected:

  • Incorrect installation of acceleration sensor (airbag ECU assembly).
  • Abnormal acceleration sensor (airbag ECU assembly) signal.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1232

Deceleration Sensor

562

563

When the vehicle speed is 10 km/h (6 mph) or more, the acceleration sensor output value does not change for 30 seconds or more.

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

Comes on

  • INF Code 562: SAE Code C051C (Case 3)
  • INF Code 563: SAE Code C051C (Case 4)
  • ABS DTC

C1243

Deceleration Sensor Stuck

561

564

565

  • INF Code: 561
    • The acceleration sensor output value does not change 16 times or more before the vehicle speed reaches 0 km/h (0 mph) from 30 km/h (19 mph).
  • INF Code: 564
    • The longitudinal and lateral output values of the acceleration sensor are not within the specified range for 60 seconds or more.
  • INF Code: 565
    • The lateral output value of the acceleration sensor is not within the specified range for 60 seconds or more.
  • Acceleration sensor (airbag ECU assembly) installed improperly
  • Acceleration sensor (airbag ECU assembly)

Comes on

  • INF Code 561: SAE Code C051C (Case 1)
  • INF Code 564: SAE Code C0520 (Case 2)
  • INF Code 565: SAE Code C0520 (Case 1)
  • ABS DTC

C1245

Abnormal Output in Deceleration Sensor

581

When the vehicle speed is 30 km/h (19 mph) or more, the difference between the deceleration value from the acceleration sensor and deceleration value calculated from the change in vehicle speed exceeds 0.35 G for 60 seconds or more.

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

Comes on

  • INF Code 581: SAE Code C051C (Case 2)
  • ABS DTC

MONITOR DESCRIPTION

When the vehicle is being driven or is braking and the following conditions are met, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration sensor (airbag ECU assembly) is stuck or is outputting an abnormal value and illuminates the MIL and stores a DTC.

  • The output of the longitudinal G sensor does not change substantially a certain number of times.
  • The difference in the estimated acceleration calculated based on the vehicle speed and the output value from the acceleration sensor is more than a specific value for a certain amount of time.
  • The output values of the longitudinal G and lateral G sensor is outside the normal expected range.
  • The longitudinal G and lateral G sensor within the acceleration sensor (airbag ECU assembly) is stuck.

MONITOR STRATEGY

Related DTCs

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

Required Sensors/Components(Main)

Acceleration sensor (airbag ECU assembly)

Speed sensor

Required Sensors/Components(Related)

Skid control ECU (brake booster with master cylinder assembly)

Acceleration sensor (airbag ECU assembly)

Speed sensor

Brake actuator (brake booster with master cylinder assembly)

Frequency of Operation

Continuous

Duration

-: C051C (Case 3 and 4)

16 times: C051C (Case 1)

60 seconds: C051C (Case 2) and C0520 (Case 1 and 2)

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

C051C (Case 1)

Monitor runs whenever the following DTCs are not stored

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

C051E (Acceleration sensor intermittent/erratic)

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

On

Test Mode

Off

Maintenance mode

Off

Acceleration slip state

Not slip

Acceleration sensor fail (C051C (Case 2), C051E, C0520 (Case 3))

Not detected

C051C (Case 2)

Monitor runs whenever the following DTCs are not stored

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

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

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

C051E (Acceleration sensor intermittent/erratic)

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

Test Mode

Off

Maintenance mode

Off

Control valve solenoid

Non-drive

Acceleration slip state

Not slip

Vehicle speed

Higher than 30 km/h (19 mph)

Acceleration sensor 1 (longitudinal G) invalidation/validation (CAN communication data)

"0" (Valid)

Acceleration sensor fail (C051C (Case 1, 3 and 4), C051E, C0520)

Not detected

C051C (Case 3 and 4)

Monitor runs whenever the following DTCs are not stored

None

Both of the following conditions are met

-

Test Mode

Off

Maintenance mode

Off

C0520 (Case 1 and 2)

Monitor runs whenever the following DTCs are not stored

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

C051E (Acceleration sensor intermittent/erratic)

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

On

Test Mode

Off

Maintenance mode

Off

Acceleration sensor fail (C051C (Case 2), C051E, C0520 (Case 3))

Not detected

TYPICAL MALFUNCTION THRESHOLDS

C051C (Case 1)

When the vehicle speed is decreasing from more than 30 km/h (19 mph) to 0 km/h (0 mph), change in the output value of the acceleration sensor (longitudinal G)

Less than 0.29 m/s2

C051C (Case 2)

Difference in output value of the acceleration sensor (longitudinal G) and the acceleration calculated based on the vehicle speed

Higher than 3.43 m/s2

C051C (Case 3)

Acceleration sensor (longitudinal G) stuck

On

C051C (Case 4)

Acceleration sensor (lateral G) stuck

On

C0520 (Case 1)

Acceleration sensor 2

13.73 m/s2 or more, or -13.73 m/s2 or less

C0520 (Case 2)

Either of the following condition is met

A or B

A. Both of the following conditions are met

-

Acceleration sensor 1

13.73 m/s2 or more

Acceleration sensor 2

13.73 m/s2 or more

B. Both of the following conditions are met

-

Acceleration sensor 1

-13.73 m/s2 or less

Acceleration sensor 2

-13.73 m/s2 or less

COMPONENT OPERATING RANGE

C051C (Case 1) and C0520 (Case 1 and 2)

Both of the following conditions are met

-

Test Mode

Off

Acceleration sensor validation

Valid

C051C (Case 2)

All of the following conditions are met

-

Test Mode

Off

Maintenance mode

Off

Acceleration sensor (longitudinal G) validation

Valid

C051C (Case 3)

All of the following conditions are met

-

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

"0" (no abnormality)

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

"0" (no abnormality)

Acceleration sensor (longitudinal G) validation

Valid

Acceleration sensor (longitudinal G) output validation flag

On

Acceleration sensor (longitudinal G) stuck

Off

C051C (Case 4)

All of the following conditions are met

-

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

"0" (no abnormality)

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

"0" (no abnormality)

Acceleration sensor (lateral G) validation

Valid

Acceleration sensor 2 (lateral G)

Higher than -7.85 m/s2, and less than 7.85 m/s2

Acceleration sensor (lateral G) stuck

Off

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 more than 30 km/h (19 mph) for 1 minute, and then wait for 60 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

HINT:

When U0124 and/or U0126 is output together with C1232, C1243 and/or C1245, inspect and repair the trouble areas indicated by U0124 and/or U0126 first.

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

    Hydraulic Control System Malfunction (C1214)

    Yaw Rate Sensor discrimination (C1240)

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