STAR Service News Missed an issue? - Toyota Parts & Service
STAR Service News Missed an issue? - Toyota Parts & Service
STAR Service News Missed an issue? - Toyota Parts & Service
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TOYOTA TECHNICAL<br />
The DC motor speed is reduced through the<br />
use of the worm gear <strong>an</strong>d wheel gear.<br />
Specifi ed condition: 0.95 to<br />
2.5V<br />
2 (TRQ2) - 1 (TRQG)<br />
Condition: Steering wheel not<br />
turned (without load).<br />
Specifi ed condition: 2.3 to<br />
2.7V<br />
Condition: Steering wheel<br />
The EPS ECU is located under<br />
the dash.<br />
The EPS motor is connected directly to the<br />
power steering ECU.<br />
turned to right with vehicle<br />
stopped.<br />
Specifi ed condition:<br />
0.95 to 2.5V<br />
Condition: Steering<br />
wheel turned to left with<br />
vehicle stopped.<br />
Specifi ed condition: 2.5<br />
to 4.04V<br />
4 (TRQF) - 1 (TRQG)<br />
Condition: Always.<br />
Specifi ed condition: 3.35 to 3.37V<br />
3 (TRQV) - 1 (TRQG)<br />
Condition: Always.<br />
Specifi ed condition: 8.5 to<br />
10.5V<br />
POWER STEERING<br />
MOTOR INSPECTION<br />
PROCEDURE<br />
Read the value using intelligent<br />
tester (motor voltage):<br />
MOTOR ROTATION<br />
ANGLE SENSOR<br />
MALFUNCTION<br />
If a power steering motor<br />
<strong>an</strong>gle sensor problem occurs, the<br />
trouble area will be in the steering<br />
column assembly or the power<br />
steering ECU.<br />
Check the installation condition<br />
of the motor rotation <strong>an</strong>gle sensor<br />
connection.<br />
Verify that its connector<br />
is securely<br />
connected to the<br />
power steering ECU.<br />
Check for DTCs<br />
again. If a DTC is still<br />
present, connect<br />
the intelligent tester<br />
(with CAN VIM) to<br />
the DLC3. Turn the ignition ON<br />
<strong>an</strong>d press the intelligent tester<br />
main switch ON.<br />
Select the item “MOTOR RO-<br />
TATE” in the data list <strong>an</strong>d observe<br />
the value displayed on the<br />
tester.<br />
During steering operation, motor<br />
rotation <strong>an</strong>gle values should<br />
ch<strong>an</strong>ge from 0 to 360 degrees.<br />
If this r<strong>an</strong>ge is not observed,<br />
replace the steering column assembly.<br />
If the DTC remains <strong>an</strong>d the specifi<br />
ed <strong>an</strong>gle values were observed,<br />
replace the EPS ECU.<br />
PROBLEM SYMPTOMS<br />
Heavy steering:<br />
• Front tires improperly infl ated<br />
<strong>an</strong>d/or unevenly worn.<br />
• Incorrect front wheel alignment.<br />
• Lower ball joint(s) worn or damaged.<br />
• Steering gear assembly worn or<br />
damaged.<br />
• Power steering motor fault.<br />
• Power source voltage of the EPS<br />
ECU.<br />
• EPS ECU.<br />
Steering eff ort diff ers between<br />
turning right <strong>an</strong>d left, or steering<br />
eff ort uneven:<br />
• Front tires improperly infl ated or<br />
worn.<br />
• Incorrect front wheel alignment.<br />
• Lower ball joint(s).<br />
• Steering gear assembly.<br />
• Torque sensor (built into steering<br />
column).<br />
• Steering column assembly.<br />
• Power steering motor.<br />
• EPS ECU.<br />
18 <strong>STAR</strong> <strong>Service</strong> <strong>News</strong><br />
Spring 2010
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