Lexus ES: 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. |
| Comes on |
|
| C1243 | Deceleration Sensor Stuck | 561 564 565 |
|
| Comes on |
|
| 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. |
| Comes on |
|
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 |
| 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 |
| Monitor runs whenever the following DTCs are not stored | None |
| Both of the following conditions are met | - |
| Test Mode | Off |
| Maintenance mode | Off |
| 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 |
| 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 |
| Acceleration sensor (longitudinal G) stuck | On |
| Acceleration sensor (lateral G) stuck | On |
| Acceleration sensor 2 | 13.73 m/s2 or more, or -13.73 m/s2 or less |
| 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 |
| All of the following conditions are met | - |
| Test Mode | Off |
| Maintenance mode | Off |
| Acceleration sensor (longitudinal G) validation | Valid |
| 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 |
| 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
- 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 (READY).
- Turn the Techstream on.
- Drive the vehicle at a speed of more than 30 km/h (19 mph) for 1 minute, and then wait for 60 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
.gif)
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.
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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 | .gif) | REPLACE AIRBAG ECU ASSEMBLY |
| NG | | INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
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