Lexus ES: 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. |
| Comes on |
|
| 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. |
| Does not come on | VSC DTC |
MONITOR DESCRIPTION
- 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
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Wait 10 seconds.
- Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
-
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
-
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here
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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.
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PROCEDURE
| 1. | CHECK DTC |
(a) Clear the DTCs.
Click here
(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Check if the same DTC is output.
Click here
| 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 |
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