Lexus ES: Steering Angle Sensor Output (C1434)
DESCRIPTION
Steering angle sensor signals are input to the skid control ECU (brake booster with master cylinder assembly) via the CAN communication system.
HINT:
When a malfunction occurs in the communication line to the steering angle sensor, U0126 (Lost Communication With Steering Angle Sensor Module) is output.
If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.
DTCs may be stored if one of the following occurs:
- Steering angle sensor zero point malfunction.
- Steering angle sensor signal malfunction.
- Steering angle sensor installation abnormality.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C1434 | Steering Angle Sensor Output | 701 | When communication is normal, a steering angle sensor malfunction is detected. |
| Does not come on | VSC DTC |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK DTC |
(a) Clear the DTCs.
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(b) Turn the power switch off.
(c) Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.
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(d) Turn the power switch on (READY).
(e) Drive the vehicle at a speed of 35 km/h (22 mph), turn the steering wheel to the right and left, and check that no speed sensor and/or yaw rate and acceleration sensor DTCs are output.
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| Result | Proceed to |
|---|---|
| DTC C1434 is output. | A |
| CAN communication system DTCs are output. | B |
| Speed sensor and/or yaw rate and acceleration sensor DTCs are output. | C |
HINT:
- If there is a malfunction in a speed sensor or the yaw rate and acceleration sensor (airbag ECU assembly), an abnormal value may be output even though the steering angle sensor is normal.
- If speed sensor and yaw rate and acceleration sensor DTCs are output simultaneously, repair these malfunctions and inspect the steering angle sensor.
| B | .gif) | INSPECT CAN COMMUNICATION SYSTEM |
| C | | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
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| 2. | CHECK STEERING ANGLE SENSOR INSTALLATION |
(a) Turn the power switch off.
(b) Check that the steering angle sensor has been installed properly.
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OK:
The steering angle sensor installation is normal.
| NG | | INSTALL STEERING ANGLE SENSOR CORRECTLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
| (a) Remove the steering wheel and column cover. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the G62 steering angle sensor connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G62-4 (BAT) - Body ground | Always | 11 to 14 V |
| G62-9 (IG1) - Body ground | Power switch on (IG) | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
| 4. | CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
| (a) Turn the power switch off. |
|
(b) Measure the resistance according to the value(s) in the table below.
NOTICE:
Before measuring the resistance of the steering angle sensor, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or switches, or opening or closing the doors.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G62-6 (ESS) - Body ground | 1 minute after power switch off | Below 1 Ω |
| OK | | REPLACE STEERING ANGLE SENSOR |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) |
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