Lexus NX: Steering Angle Sensor Communication Error (C1784)
DESCRIPTION
Steering sensor signals are sent to the absorber control ECU via CAN communication.
When there is a communication malfunction, the malfunction will be detected by the diagnosis function.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| C1784 | Steering Angle Sensor Communication Error | A steering sensor signal malfunction is detected, or a steering sensor power malfunction signal is detected for 5 seconds or more. |
| Does not come on |
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the steering sensor, confirm that the replacement part is of the correct specification.
- Before performing troubleshooting, inspect the connectors of related circuits.
-
If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.
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Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation ; 2) DTC inspection ; and 3) Techstream inspection (ECU Data List or Active Test ). If no malfunctions are found in other areas, replace the absorber control ECU.
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When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.
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PROCEDURE
| 1. | CHECK FOR DTC (CAN COMMUNICATION SYSTEM) |
(a) Check for DTCs.
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| Result | Proceed to |
|---|---|
| CAN DTC is not output | A |
| CAN DTC is output | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
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| 2. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Check for steering sensor malfunction DTCs.
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| Result | Proceed to |
|---|---|
| DTC is not output | A |
| DTC is output | B |
| A | | REPLACE ABSORBER CONTROL ECU |
| B | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) |
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DESCRIPTION
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Power Steering ECU Communication Stop Mode
DESCRIPTION Detection Item Symptoms Trouble Area Power Steering ECU Communication Stop Mode Any of the following conditions are met:
Communication stop for "Power Steering (EPS)" is indicated on "Communication Bus Check".
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Communication system DTCs (DTCs that start wi
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be dis
