Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL
CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION
INSPECT YAW RATE AND ACCELERATION SENSOR (IG TERMINAL)
INSPECT YAW RATE AND ACCELERATION SENSOR (GND TERMINAL)
DTC C1232/32 Stuck in Acceleration Sensor
DTC C0371/71 Yaw Rate Sensor (Test Mode DTC)
DTC C1234/34 Yaw Rate Sensor Malfunction
DTC C1243/43 Acceleration Sensor Stuck Malfunction
DTC C1244/44 Open or Short in Acceleration Sensor Circuit
DTC C1245/45 Acceleration Sensor Output Malfunction
DTC C1279/79 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)
DTC C1381/97 Yaw Rate and / or Acceleration Sensor Power Supply Voltage Malfunction
DESCRIPTION
The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system.
The yaw rate sensor has a built in acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).
If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, the DTC U0123/62 (malfunction in CAN communication with the yaw rate sensor) and U0124/95 (malfunction in CAN communication with the acceleration sensor) are output.
These DTCs are also output when the calibration has not been completed.
DTCs C0371/71 and C1279/79 can be deleted when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or the Test Mode ends. DTCs C0371/71 and C1279/79 are output only in the Test Mode.
| DTC No. | DTC Detection Condition | Trouble Area |
| C1232/32 | At a vehicle speed of 6 mph (10 km/h) or more, either GL1 or GL2 (input signal) does not change for 30 seconds or more. | Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit |
| C1234/34 | Sensor malfunction signal is received from the yaw rate sensor. | Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit |
| C1243/43 | While the vehicle speed changes from 19 mph (30 km/h) to 0 mph (0 km/h), the condition that the values of GL1 and GL2 do not change occurs 16 times or more. | Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit |
| C1244/44 | When either of the following is detected: A data malfunction signal is received from the acceleration sensor. After the difference between GL1 and GL2 becomes 0.6 G or more with the vehicle stationary, the difference remains 0.4 G or more for 60 seconds or more. | Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit |
| C1245/45 | At a vehicle speed of 19 mph (30 km/h) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed sensor exceeds 0.35 G for 60 seconds or more. | Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit |
| C1381/97 | At a vehicle speed of more than 2 mph (3 km/h), the acceleration sensor power source malfunction signal is received for 10 seconds or more. | Yaw rate and acceleration sensor Yaw rate and acceleration sensor power source circuit |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the yaw rate and acceleration sensor, perform zero point calibration .
- HINT:
- When U0123/62, U0124/95 or U0126/63 is output together with C1232/32, C1234/34, C1243/43, C1244/44, C1245/45, or C1381/97, inspect and repair the trouble areas indicated by U0123/62, U0124/95 or U0126/63 first.
| 1.CHECK DTC |
Clear the DTC .
Turn the engine switch off.
At a speed of 18 mph (30 km/h) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal).
Turn the engine switch on (IG) again and check that no CAN communication system DTC is output.
Check if DTCs for zero point calibration of the yaw rate sensor undone (C1210/36) or for zero point calibration of the acceleration sensor undone (C1336/39) are output.
- Result:
Condition Proceed to DTCs (C1210/36, C1336/39, and/or CAN communication system DTC) are not output A CAN communication system DTC is output B DTCs (C1210/36 and/or C1336/39) are output C
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| A | |
| 2.CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION |
Turn the engine switch off.
Check that the yaw rate and acceleration sensor has been installed properly .
- OK:
- The sensor is tightened to the specified torque.
- The sensor is not tilted.
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| OK | |
| 3.INSPECT YAW RATE AND ACCELERATION SENSOR (IG TERMINAL) |
Disconnect the yaw rate and acceleration sensor connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection Condition Specified Condition J41-5 (IG) - Body ground Engine switch on (IG) 10 to 14 V
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| OK | |
| 4.INSPECT YAW RATE AND ACCELERATION SENSOR (GND TERMINAL) |
Turn the engine switch off.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition J41-1 (GND) - Body ground Always Below 1 Ω
- NOTICE:
- Check the yaw rate and acceleration sensor signal after replacement .
- HINT:
- If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step .
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| OK | ||
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