Toyota Yaris: Power Steering System / Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold (C151A17)
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 | Return-to-normal Condition | Note |
C151A17 | Power Steering Torque Sensor "A" Supply Voltage Circuit Voltage Above Threshold | TRQV1 voltage is 5.6 V or more | -
Torque sensor (Electric power steering column sub-assembly)
-
Power steering ECU assembly
| EPS warning light: Comes on | Ignition switch ON again | - |
WIRING DIAGRAM
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 here
-
When the power steering ECU assembly has been replaced, perform Power Steering ECU Initial Setting (assist map writing).
Click here
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 |
NG |
| REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY |
OK |
| |
2. | INSPECT POWER STEERING ECU ASSEMBLY (POWER SOURCE OF TORQUE SENSOR) |
(a) Start the engine.
(b) 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 | |
| *a | Component with harness connected (Power Steering ECU Assembly) | | |
OK |
| REPLACE ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY |
NG |
| REPLACE POWER STEERING ECU ASSEMBLY |
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...
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...
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Categories

Smart key
Auxiliary key
Key code number plate
To use the auxiliary key, press the knob and pull out the auxiliary key
from the smart key.

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