Lexus NX: Torque Sensor1 (C1511-C1514)
DESCRIPTION
The torque sensor converts the steering wheel rotation torque into electric signals and sends them to the power steering ECU assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition |
|---|---|---|---|---|---|
| C1511 | Torque Sensor1 | Torque sensor malfunction |
| On | Power switch on (IG) again |
| C1512 | Torque Sensor2 | Torque sensor malfunction |
| On | Power switch on (IG) again |
| C1513 | Torque Sensor Deviation Excessive | Torque sensor malfunction |
| On | Power switch on (IG) again |
| C1514 | Torque Sensor Power Supply Voltage | Torque sensor malfunction |
| On | Power switch on (IG) again |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the power steering ECU assembly has been replaced, perform assist map writing.
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PROCEDURE
| 1. | CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - ECU) |
(a) Check the connection condition of the torque sensor connector.
OK:
Torque sensor connector is securely connected to the power steering ECU assembly.
| NG | .gif) | CONNECT CONNECTOR |
|
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| 2. | CHECK POWER STEERING ECU ASSEMBLY (TRQV, TRQF VOLTAGE) |
| (a) Turn the power switch on (READY). |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| a-3 (TRQV) - a-1 (TRQG) | Power switch on (READY) | 8.5 to 10.5 V |
| a-5 (TRQF) - a-1 (TRQG) | Power switch on (READY) | 3.35 to 3.37 V |
| NG | | REPLACE POWER STEERING ECU ASSEMBLY |
|
| 3. | CHECK POWER STEERING ECU ASSEMBLY (TRQ1, TRQ2 VOLTAGE) |
| (a) Turn the power switch on (READY). |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| a-7 (TRQ1) - a-1 (TRQG) | Power switch on (READY) Steering wheel not being turned (without load) | 2.3 to 2.7 V |
| Power switch on (READY) Steering wheel being turned to the right with vehicle stopped | 2.5 to 4.7 V | |
| Power switch on (READY) Steering wheel being turned to the left with vehicle stopped | 0.3 to 2.5 V | |
| a-2 (TRQ2) - a-1 (TRQG) | Power switch on (READY) Steering wheel not being turned (without load) | 2.3 to 2.7 V |
| Power switch on (READY) Steering wheel being turned to the right with vehicle stopped | 0.3 to 2.5 V | |
| Power switch on (READY) Steering wheel being turned to the left with vehicle stopped | 2.5 to 4.7 V |
(c) Under each condition, measure the voltage at terminals TRQ1 and TRQ2, and calculate the sum.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Sum of voltage between a-7 (TRQ1) and a-1 (TRQG) and voltage between a-2 (TRQ2) and a-1 (TRQG) | Power switch on (READY) Steering wheel not being turned (without load) | Between 4.85 V and 5.35 V |
| Power switch on (READY) Steering wheel being turned to the right with vehicle stopped | ||
| Power switch on (READY) Steering wheel being turned to the left with vehicle stopped |
| OK | | REPLACE POWER STEERING ECU ASSEMBLY |
| NG | | REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY |
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