RM38T0EC _55 Steering _112287 POWER ASSIST SYSTEMS _0510880 POWER STEERING SYSTEM C

POWER ASSIST SYSTEMS  POWER STEERING SYSTEM  C151A17  Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold  


DESCRIPTION

The power steering ECU assembly supplies a voltage of 5 V to the torque sensor (electric power steering column sub-assembly) and monitors the voltage value of the Hall IC inside the torque sensor (electric power steering column sub-assembly) which changes in response to changes in the magnetic flux density (steering torque) detected by the Hall IC, and calculates the assist torque.

While DTC C151A17 is detected, power assist is stopped or assist amount is limited due to fail-safe operation.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
C151A17 Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold TRQV1 voltage is high voltage abnormality
·

Torque sensor (Electric power steering column sub-assembly)

·

Power steering ECU assembly


EPS warning light: Comes on

WIRING DIAGRAM

C409221E32
0.146,2.979 2.615,3.375 2.469,0.396 10 false Torque Sensor (Electric Power Steering Column Sub-assembly) 4.896,3.115 6.948,3.521 2.052,0.406 10 false Power Steering ECU Assembly 4.896,2.938 5.208,3.135 0.313,0.198 10 false z7 5.094,1.094 5.865,1.292 0.771,0.198 10 false TRQV1 5.094,1.729 5.865,1.927 0.771,0.198 10 false TRQG1 4.875,1.094 5.031,1.292 0.156,0.198 10 false 7 4.875,1.729 5.031,1.927 0.156,0.198 10 false 8 6.031,0.646 6.344,0.844 0.313,0.198 10 false 5 V

CAUTION / NOTICE / HINT

NOTICE:
·

When the electric power steering column sub-assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>CALIBRATION

·

When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM>CALIBRATION



PROCEDURE

1.INSPECT TORQUE SENSOR (ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY) (CHECK FOR SHORT)
a.

Disconnect the z7 power steering ECU assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
z7-7 (TRQV1) - Body ground Always 10 kΩ or higher
z7-7 (TRQV1) - z7-8 (TRQG1) Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.INSPECT POWER STEERING ECU ASSEMBLY (POWER SOURCE OF TORQUE SENSOR)

NG

REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>REMOVAL


2.INSPECT POWER STEERING ECU ASSEMBLY (POWER SOURCE OF TORQUE SENSOR)
a.

Start the engine.


b.
C319556C84
1.5,0.292 1.948,0.583 0.448,0.292 2.521,1.302 1.958,2.135 true 0.865,2.781 1.646,2.26 true 0.229,0.188 0.542,0.344 0.313,0.156 10 false *a 0.542,2.823 1.021,3.104 0.479,0.281 10 false TRQG1 2.323,1.115 2.802,1.396 0.479,0.281 10 false TRQV1 1.646,0.344 2.125,0.625 0.479,0.281 10 false z7
*a Component with harness connected
(Power Steering ECU Assembly)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
z7-7 (TRQV1) - z7-8 (TRQG1) Ignition switch ON 4.5 to 5.5 V



Result:
Proceed to
OK
NG



OK

REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY

Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>REMOVAL


NG

REPLACE POWER STEERING ECU ASSEMBLY

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING ECU>REMOVAL