Lexus ES: Multi-axis Acceleration Sensor Module "A" Missing Calibration (C051D54)
DESCRIPTION
The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly) via CAN communication.
HINT:
If a communication error with the yaw rate and acceleration sensor (airbag ECU assembly) is detected, DTCs U012587 and U015187 are stored.
The DTC is also stored when the calibration has not been completed.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C051D54 | Multi-axis Acceleration Sensor Module "A" Missing Calibration | Zero point calibration of acceleration sensor undone. |
|
CAUTION / NOTICE / HINT
NOTICE:
-
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform acceleration sensor zero point calibration and store system information memorization after performing "Reset Memory".
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PROCEDURE
| 1. | PERFORM ACCELERATION SENSOR ZERO POINT CALIBRATION |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / Brake/EPB / Utility / Reset Memory.
(d) Clear the zero point calibration data and system information.
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| Tester Display |
|---|
| Reset Memory |
(e) Perform acceleration sensor zero point calibration and store system information memorization.
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| Tester Display |
|---|
| Calibration |
|
| 2. | RECONFIRM DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Clear DTCs(d) Press the DTC clear button.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG).
(g) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Trouble Codes(h) Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| C051D54 is not output | A |
| C051D54 is output | B |
| A |  | END |
|
| 3. | CHECK AIRBAG ECU ASSEMBLY INSTALLATION |
(a) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.
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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 installed in a tilted position.
| NG | | INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
|
| 4. | READ VALUE USING TECHSTREAM (ACCELERATION SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / Brake/EPB / Data List.
Chassis > Brake/EPB > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Lateral G | Lateral G | Min.: -25.105 m/s2, Max.: 24.908 m/s2 | Turning right: -25.105 to 0.000 m/s2 Turning left: 0.000 to 24.908 m/s2 | During turning: Changes in proportion with lateral acceleration |
| Forward and Rearward G | Forward and rearward G | Min.: -25.105 m/s2, Max.: 24.908 m/s2 | During deceleration: -25.105 to 0.000 m/s2 During acceleration: 0.000 to 24.908 m/s2 | During acceleration/deceleration: Changes in proportion with acceleration |
| Tester Display |
|---|
| Lateral G |
| Forward and Rearward G |
(d) Check the acceleration sensor (airbag ECU assembly) output value displayed on the Techstream.
OK:
The acceleration sensor (airbag ECU assembly) output value is normal.
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPLACE AIRBAG ECU ASSEMBLY |
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