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. |
- Acceleration sensor (airbag ECU assembly)
- Acceleration sensor (airbag ECU assembly) installed improperly
| Comes on |
- INF Code 572: SAE Code C051E
- ABS DTC
| | 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. |
- Yaw rate sensor (airbag ECU assembly)
- Yaw rate sensor (airbag ECU assembly) installed improperly
| Does not come on |
VSC DTC | MONITOR DESCRIPTION C051E:
- 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 
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
PROCEDURE
(a) Clear the DTCs. Click here
Chassis > ABS/VSC/TRAC > Clear DTCs
(b) Turn the power switch off. (c) Turn the power switch on (IG).
(d) Check if the same DTC is output. Click here
Chassis > ABS/VSC/TRAC > Trouble Codes
| 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 | | 
