- Torque sensor (electric power steering column sub-assembly) malfunction
- Power steering motor assembly malfunction
- Power steering ECU assembly malfunction
Lexus NX: Fail-safe Chart
FAIL-SAFE CHART
If a problem occurs in the power steering system, the power steering assist will be stopped or the amount of power assist will be decreased to protect the system.
Power Steering System| Malfunction | Fail-safe Operation | Power steering warning light | Buzzer |
|---|---|---|---|
| | Power steering assist stops or assist amount is limited | Red or yellow | Sounds intermittently or once |
| Power steering assist is temporarily limited | Yellow | Sounds once |
HINT:
- If the power steering assist stops, the power steering warning light (red) comes on.
- If the amount of power assist is reduced, the power steering warning light (yellow) comes on and a vibration or sound may occur.
- The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or being driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal when the steering wheel is not turned for approximately 10 minutes with the power switch on (READY).
- If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the power steering warning light will come on. In such cases, the amount of power assist returns to normal when the auxiliary battery voltage recovers.
READ NEXT:
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. Th
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Power Steering System DTC No. Detection Item Warning Indicate Return-to-normal Condition Link C1511 Torque Sensor1 On Power switch on (IG) again
On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. CHECK STEERING EFFORT (TORQUE) CAUTION: These service operations may affect the SRS airbags. Be sure to read the precautionary notices concerning the SRS airbag syst
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT REAR CENTER ULTRASONIC SENSOR (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 4 (BI) - 6 (EI) Always 10 kΩ or higher 4 (BI) - 1 (BO) Always Below
Parts Location
PARTS LOCATION ILLUSTRATION *A w/o AVS - - *1 FRONT AXLE HUB SUB-ASSEMBLY RH - FRONT SPEED SENSOR ROTOR RH *2 FRONT SPEED SENSOR RH *3 FRONT AXLE HUB SUB-ASSEMBLY LH - FRONT SPEED SENSOR ROTOR LH *4 FRONT SPEED SENSOR LH *5 REAR SPEED SENSOR RH *6 REAR AXLE HU
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