Toyota Yaris: Power Steering System / On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. CHECK STEERING EFFORT (TORQUE)
NOTICE:
These service operations may affect the SRS airbags. Be sure to read the precautionary notices concerning the SRS airbag system before servicing.
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(a) Stop the vehicle on a level, paved surface and align the wheels straight ahead.
(b) Remove the horn button assembly.
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(c) Connect the cable to the negative (-) auxiliary battery terminal.
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(d) Using a torque wrench, check that the steering wheel set bolt is properly tightened.
Torque:
62 N·m {632 kgf·cm, 46 ft·lbf}
(e) Turn the power switch on (READY) so that the power steering is ready to operate. (for HV Model)
(f) Start the engine so that the power steering is ready to operate. (for Gasoline Model)
(g) Turn the steering wheel 90 degrees to the right and check steering effort (torque) with the steering wheel turned. Check in the opposite direction using the same method.
Standard Steering Effort (Reference):
5.5 N*m (56 kgf*cm, 49 in.*lbf) or less
(h) Align the front wheels facing straight ahead.
(i) Turn the ignition switch off.
(j) Disconnect the cable from the negative (-) auxiliary battery terminal.
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(k) Install the horn button assembly.
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DIAGNOSTIC TROUBLE CODE CHART Power Steering System DTC No. Detection Item DTC Detection Condition Warning Indicate Return-to-normal Condition Note Link C05D604 Power Steering Control Module Processor System Internal Failure ECU internal malfunction (CPU malfunction) EPS warning light: Comes on Ignition switch ON again -
C05D646 Power Steering Control Module Processor Calibration / Parameter Memory Failure ECU internal malfunction (EEPROM error) EPS warning light: Comes on Ignition switch ON again -
C05D649 Power Steering Control Module Processor Internal Electronic Failure ECU internal malfunction (Peripheral circuit malfunction) EPS warning light: Comes on Ignition switch ON again -
C10001C Control Module Internal Temperature Sensor "A" Circuit Voltage Out of Range ECU temperature sensor "A" range malfunction EPS warning light: Comes on The ECU judges the system has returned to normal -
C123A17 Supply Voltage Circuit Circuit Voltage Above Threshold IG voltage is 18...
VEHICLE CONTROL HISTORY DESCRIPTION
Vehicle Control History is a function that captures and stores ECU data when triggered by specific vehicle behavior...
Other information:
The rear window defogger clears fog from the rear window.
The ignition must be switched ON to use the defogger.
Press the switch to turn on the rear window defogger. The rear window
defogger operates for about 15 minutes and then turns off automatically...
TERMINALS OF ECM ECM
HINT: The standard voltage and resistance of each ECM terminal is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard voltage or resistance for that pair of terminals shown in the "Specified Condition" column Use the illustration above as a reference for the ECM terminals...