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...
Other information:
SYSTEM DESCRIPTION POWER WINDOW CONTROL SYSTEM DESCRIPTION (a) The power window control system controls the power window operation using the power window regulator motor assemblies. The main controls of this system are the multiplex network master switch assembly (mounted on the driver door) and power window regulator switch assembly (mounted on the front passenger door) ...
TERMINALS OF ECU TERMINALS OF ECU
*a Component without harness connected (Skid Control ECU [Brake Actuator Assembly]) - - Terminal No. (Symbol) Terminal Description 1 (GND2) Pump motor ground 2 - (Not used) 3 - (Not used) 4 - (Not used) 5 (STP2) Stop light switch assembly input 6 - (Not used) 7 - (Not used) 8 - (Not used) 9 - (Not used) 10 (CANL) CAN communication line L 11 - (Not used) 12 (IGR) ECU power supply input 13 (BM) Motor relay power supply 14 (SP1) Speed signal output for speedometer 15 (RR-) Rear wheel speed RH (-) signal input 16 (RR+) Rear wheel speed RH (+) power supply output 17 (FL-) Front wheel speed LH (-) signal input 18 (FL+) Front wheel speed LH (+) power supply output 19 - (Not used) 20 - (Not used) 21 - (Not used) 22 (CANH) CAN communication line H 23 - (Not used) 24 - (Not used) 25 (GND1) Skid control ECU (brake actuator assembly) ground 26 (STPO) Stop light switch assembly output 27 - (Not used) 28 (RL-) Rear wheel speed LH (-) signal input 29 (RL+) Rear wheel speed LH (+) power supply output 30 (FR-) Front wheel speed RH (-) signal input 31 (FR+) Front wheel speed RH (+) power supply output 32 - (Not used) 33 (CSW) VSC OFF switch (combination switch assembly) input 34 - (Not used) 35 (STP) Stop light switch assembly input 36 (CA2H) CAN communication line H 37 (CA2L) CAN communication line L 38 (+BS) Solenoid relay power supply TERMINAL INSPECTION (a) Disconnect the A108 connector and measure the voltage or resistance on the wire harness side...
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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