Lexus ES: Zero Point Calibration of Yaw Rate Sensor undone (C1210,C1336)
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 CAN communication.
HINT:
If there are malfunctions in the bus lines between the yaw rate and acceleration sensor (airbag ECU assembly) and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) will be stored.
If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.
These DTCs (C1210 and C1336) will also be stored when zero point calibration has not been completed.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C1210 | Zero Point Calibration of Yaw Rate Sensor undone | 1139 | Yaw rate sensor zero point calibration is incomplete. |
| Does not come on | VSC DTC |
| C1336 | Zero Point Calibration of Deceleration Sensor undone | 1138 | Acceleration sensor zero point calibration is incomplete. |
| Only DTC C1336 (INF code 1138) is stored: Does not come on SAE Code C1336 is stored: Comes on |
|
MONITOR DESCRIPTION
- The skid control ECU (brake booster with master cylinder assembly) monitors the acceleration sensor zero point calibration for successful completion. When the vehicle is being driven, if the acceleration sensor 1 or acceleration sensor 2 zero point range is outside the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration sensor zero point calibration is abnormal and illuminates the MIL and stores this DTC.
-
The skid control ECU (brake booster with master cylinder assembly) monitors the acceleration sensor zero point calibration for successful completion. If the acceleration sensor 1 or acceleration sensor 2 zero point range is outside the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration zero point calibration is abnormal and illuminates the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights, blinks* the brake hold operated indicator light and stores this DTC.
HINT:
-
*: The brake hold switch (No. 3 combination switch assembly) is turned on under the following vehicle conditions.
-
Vehicle Conditions:
- The driver side door is closed.
- The driver side seat belt is fastened.
-
Vehicle Conditions:
- As the detection conditions slightly differ from SAE code C1336, the detection conditions for DTC C1336 (INF code 1138) is also provided.
-
*: The brake hold switch (No. 3 combination switch assembly) is turned on under the following vehicle conditions.
MONITOR STRATEGY
HINT:
SAE code only.
C1336| Related DTCs | C1336: Acceleration sensor exceeded learning limit |
| Required Sensors/Components(Main) | Skid control ECU (brake booster with master cylinder assembly) Acceleration sensor (airbag ECU assembly) |
| Required Sensors/Components(Related) | Speed sensor Skid control ECU (brake booster with master cylinder assembly) |
| Frequency of Operation | Continuous |
| Duration | - |
| MIL Operation | Immediately |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
HINT:
SAE code only.
C1336 (Case 1)| Monitor runs whenever the following DTCs are not stored | None |
| Both of the following conditions are met | - |
| Test Mode | Off |
| Vehicle speed | 40 km/h (25 mph) or more |
| Monitor runs whenever the following DTCs are not stored | None |
| Learning of zero point | Complete |
TYPICAL MALFUNCTION THRESHOLDS
HINT:
SAE code only.
C1336 (Case 1)| Learning of zero point | Not complete |
| Either of the following conditions is met | - |
| Acceleration sensor 1 zero point | -0.9 m/s2 or less, or 0.9 m/s2 or more |
| Acceleration sensor 2 zero point | -0.9 m/s2 or less, or 0.9 m/s2 or more |
COMPONENT OPERATING RANGE
HINT:
SAE code only.
C1336 (Case 1 and 2)| Both of the following conditions are met | - |
| Acceleration sensor 1 zero point | Higher than -0.9 m/s2 to less than 0.9 m/s2 |
| Acceleration sensor 2 zero point | Higher than -0.9 m/s2 to less than 0.9 m/s2 |
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.
-
Enter Test Mode.
Click here
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- 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 the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Click here
-
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 is output together with C1210 and/or C1336, inspect and repair trouble areas indicated by U0124 first.
Click here
PROCEDURE
| 1. | PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR |
(a) Perform zero point calibration of the yaw rate and acceleration sensor.
Click here
NOTICE:
Make sure to perform linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization after performing "Reset Memory" as the data stored during linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization is cleared.
Chassis > ABS/VSC/TRAC > Utility| Tester Display |
|---|
| Reset Memory |
| Tester Display |
|---|
| Test Mode |
|
| 2. | PERFORM TEST MODE (SIGNAL CHECK) |
(a) Using the Techstream, perform a Test Mode (Signal Check) inspection sensor check and check that all Test Mode (Signal Check) inspection items change from incomplete to complete.
Click here
| Tester Display |
|---|
| Signal Check |
OK:
All Test Mode (Signal Check) inspection items change from incomplete to complete
| OK |  | END |
|
| 3. | CHECK AIRBAG ECU ASSEMBLY INSTALLATION |
(a) Turn the power switch off.
(b) 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.
| NG | | INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
|
| 4. | READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR) |
(a) Select the Data List on the Techstream.
Click here
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Deceleration Sensor | Acceleration sensor 1 | Min.: -18.525 m/s2, Max.: 18.387 m/s2 | - | During deceleration/acceleration: Changes continuously |
| Deceleration Sensor2 | Acceleration sensor 2 | Min.: -18.525 m/s2, Max.: 18.387 m/s2 | - | During deceleration/acceleration: Changes continuously |
| Yaw Rate Sensor | Yaw rate sensor 1 | Min.: -128 degrees/s, Max.: 127 degrees/s | Vehicle stationary: 0 degrees/s Turning right: -128 to 0 degrees/s Turning left: 0 to 127 degrees/s | - |
| Yaw Rate Sensor2 | Yaw rate sensor 2 | Min.: -128 degrees/s, Max.: 127 degrees/s | Vehicle stationary: 0 degrees/s Turning right: -128 to 0 degrees/s Turning left: 0 to 127 degrees/s | - |
| Tester Display |
|---|
| Deceleration Sensor |
| Deceleration Sensor2 |
| Yaw Rate Sensor |
| Yaw Rate Sensor2 |
(b) Check the yaw rate and acceleration sensor (airbag ECU assembly) output value displayed on the Techstream.
OK:
The yaw rate and acceleration sensor (airbag ECU assembly) output value is normal.
| OK | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| NG | | REPLACE AIRBAG ECU ASSEMBLY |
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