Lexus NX: Torque Sensor1 (C1511-C1514,C1517)
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 | Note |
|---|---|---|---|---|---|---|
| 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 | - |
| C1517 | Torque Hold | Torque sensor malfunction |
| On | Power switch on (IG) again | - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
If the electric power steering column sub-assembly has been replaced, perform torque sensor zero point calibration.
Click here
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-
If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
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PROCEDURE
| 1. | CHECK CONNECTOR CONNECTION CONDITION |
(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 VOLTAGE) |
| (a) Turn the power switch on (IG). |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| z11-8 (TRQV) - z11-2 (TRQG) | Power switch on (IG) | 4.5 to 5.5 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 |
|---|---|---|
| z11-9 (TRQ1) - z11-2 (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 3.8 V | |
| Power switch on (READY), steering wheel being turned to the left with vehicle stopped | 1.2 to 2.5 V | |
| z11-1 (TRQ2) - z11-2 (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 | 1.2 to 2.5 V | |
| Power switch on (READY), steering wheel being turned to the left with vehicle stopped | 2.5 to 3.8 V |
(c) Under each condition, measure the voltage according to the value(s) in the table below, and calculate the sum.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Sum of voltage between z11-9 (TRQ1) and z11-2 (TRQG) and voltage between z11-1 (TRQ2) and z11-2 (TRQG) | Power switch on (READY), steering wheel not being turned (without load) | Between 4.75 V and 5.25 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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Disassembly
DISASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE NO. 1 MOULDING TAPE (a) Remove the No. 1 moulding tape (double-sided tape). HINT: Do not pull on the No. 1 moulding tape (double-sided
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