TOYOTA RAV4 2006 Service Repair Manual

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–21
PS
DESCRIPTION
The torque sensor converts the rotation torque input from the steering wheel into electric signals and
sends them to the power steering ECU.
WIRING DIAGRAM
DTC C1511/11 Torque Sensor 1 Malfunction
DTC C1512/11 Torque Sensor 2 Malfunction
DTC C1513/11 Torque Sensor Deviation Excessive
DTC C1514/11Torque Sensor Power Supply Voltage Malfunc-
tion
DTC No. DTC Detection Condition Trouble Area
C1511/11 Torque sensor malfunction • Torque sensor (built into steering column
assembly)
• Power steering ECU
• Connector C1512/11
C1513/11
C1514/11
C128931E01

PS–22POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
INSPECTION PROCEDURE
(a) Check the installation condition of the torque sensor
connector.
OK:
Torque sensor connector is securely installed to
the power steering ECU.
Result
B
A
(a) Reinstall the torque sensor connector.
(b) Check for DTCs.
OK:
DTC is not output.
B
A
(a) Turn the ignition switch ON.
(b) Measure the voltage of the ECU.
Standard voltage
1CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - ECU)
Result Proceed to
NG A
OK B
Go to step 3
2RECONFIRM DTC
Result Proceed to
DTC is output A
DTC is not output B
END
3INSPECT TORQUE SENSOR
C128930E01
Tester Connection Condition Specified Condition
6 (TRQ1) - 1 (TRQG) Steering wheel not
turned (without load)2.3 to 2.7 V
Steering wheel turned
to right with vehicle
stopped2.5 to 4.04 V
Steering wheel turned
to left with vehicle
stopped0.95 to 2.5 V

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–23
PS
NG
OK
2 (TRQ2) - 1 (TRQG) Steering wheel not
turned (without load)2.3 to 2.7 V
Steering wheel turned
to right with vehicle
stopped0.95 to 2.5 V
Steering wheel turned
to left with vehicle
stopped2.5 to 4.04 V
4 (TRQF) - 1 (TRQG) Always 3.35 to 3.37 V
3 (TRQV) - 1 (TRQG) Always 8.5 to 10.5 V
REPLACE STEERING COLUMN ASSEMBLY
Tester Connection Condition Specified Condition
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

PS–24POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
DESCRIPTION
The power steering ECU supplies current to the power steering motor through this circuit.
INSPECTION PROCEDURE
(a) Check for DTC.
OK:
DTC is not output.
OK
NG
DTC C1521/25 Short in Motor Circuit
DTC No. DTC Detection Condition Trouble Area
C1521/25 Motor over current Power steering ECU
1RECONFIRM DTC
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE POWER STEERING ECU

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–25
PS
DESCRIPTION
The power steering ECU supplies the current to the power steering motor through the motor circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON and press the intelligent
tester main switch ON.
(c) Select the items "MTR TERMINAL(U)", "MTR
TERMINAL(V)", "MTR TERMINAL(W)" in the DATA LIST
and read the value displayed on the intelligent tester.
Power steering ECU
DTC C1524/24 Motor Terminal Voltage Malfunction
DTC No. DTC Detection Condition Trouble Area
C1524/24 Short (or open) in motor circuit or abnormal
voltage or current in motor circuit• Steering column assembly
• Power steering ECU
1READ VALUE OF INTELLIGENT TESTER (MOTOR VOLTAGE)
C128932E01
Item Item Description: Range
(Display)Inspection Condition Reference Value
MTR TERMINAL(U) Motor terminal voltage (U phase):
Min.: 0 V
Max.: 46.667 VSteering wheel is turned While turning the steering wheel,
a value within the range of 1 V to
approximately 0.7 V less than the
battery voltage is displayed. (The
value changes according to the
steering load.)

PS–26POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
Result
B
A
MTR TERMINAL(V) Motor terminal voltage (V phase):
Min.: 0 V
Max.: 46.667 VSteering wheel is turned While turning the steering wheel,
a value within the range of 1 V to
approximately 0.7 V less than the
battery voltage is displayed. (The
value changes according to the
steering load.)
MTR TERMINAL(W) Motor terminal voltage (W phase):
Min.: 0 V
Max.: 46.667 VSteering wheel is turned While turning the steering wheel,
a value within the range of 1 V to
approximately 0.7 V less than the
battery voltage is displayed. (The
value changes according to the
steering load.)
Result Proceed to
While turning the steering wheel, a value within the range of 1 V to
approximately 0.7 V less than the battery voltage is displayed. (Power
assist is operating.)A
While turning the steering wheel, 0 V or a value equal to the battery
voltage is displayed. (Power assist is not operating.)B Item Item Description: Range
(Display)Inspection Condition Reference Value
REPLACE STEERING COLUMN ASSEMBLY
REPLACE POWER STEERING ECU

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–27
PS
DESCRIPTION
The motor rotation angle sensor detects the motor rotation angle and sends this information to the power
steering ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Check the installation condition of the motor rotation
angle sensor connector.
OK:
Motor rotation angle sensor connector is securely
connected to the power steering ECU.
Result
DTC C1528/12 Motor Rotation Angle Sensor Malfunction
DTC No. DTC Detection Condition Trouble Area
C1528/12 Motor rotation angle sensor malfunction • Steering column assembly
• Power steering ECU
1CHECK CONNECTOR CONNECTION CONDITION
C128934E01
Result Proceed to
NG A
OK B

PS–28POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
B
A
(a) Reinstall motor rotation angle sensor connector.
(b) Check for DTC.
OK:
DTC is not output.
Result
B
A
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON and press the intelligent
tester main switch ON.
(c) Select the items "MOTOR ROTATE" in the DATA LIST
and read the value displayed on the intelligent tester.
OK:
During steering operation, motor rotation angle
value changes from 0 to 360
NG
OK Go to step 3
2RECONFIRM DTC
Result Proceed to
DTC is output A
DTC is not output B
END
3READ VALUE OF INTELLIGENT TESTER (MOTOR ROTATION ANGLE SENSOR)
Item Item Description: Range
(Display)Inspection Condition Reference Value
MOTOR ROTATE Motor Rotation Angle:
Min.: 0
Max.: 360
Steering wheel is turned During steering operation, motor
rotation angle value changes from
0 to 360
REPLACE STEERING COLUMN ASSEMBLY
REPLACE POWER STEERING ECU

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–29
PS
DESCRIPTION
INSPECTION PROCEDURE
If the power steering ECU detects these DTCs, it will shut off the motor relay circuit (built into the power
steering ECU) and stop power assist. However, power assist continues if DTC C1533 is output.
(a) Check for DTC.
OK:
DTC is not output.
OK
NG
DTC C1531/25 ECU Malfunction
DTC C1532/25 ECU Malfunction
DTC C1533/25 Temperature Sensor Circuit is Low or High
DTC C1534/25 EEPROM Malfunction
DTC No. DTC Detection Condition Trouble Area
C1531/25 ECU internal malfunction (CPU malfunction) Power steering ECU
C1532/25 ECU internal malfunction (Peripheral circuit
malfunction)Power steering ECU
C1533/25 ECU internal malfunction (Substrate
temperature sensor malfunction)Power steering ECU
C1534/25 ECU internal malfunction (EEPROM error) Power steering ECU
1RECONFIRM DTC
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE POWER STEERING ECU

PS–30POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
DESCRIPTION
The power steering ECU distinguishes the ignition switch status as ON or OFF through the IG power
source circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON.
(c) Select the item "IG SUPPLY" in the DATA LIST and read
the value displayed on the intelligent tester.
Power steering ECU
OK
NG
DTC C1551/25 IG Power Supply Voltage Malfunction
DTC No. Detection Condition Trouble Area
C1551/25 IG power source circuit malfunction inside
ECU• ECU-IG1 fuse
• IG power source circuit
• Power steering ECU
1READ VALUE OF INTELLIGENT TESTER (IG POWER SUPPLY)
B128053E03
Item Item Description: Range
(Display)Inspection Condition Specified Condition
IG SUPPLY IG power supply:
Min.: 0 V
Max.: 20.1531 VIgnition switch ON 10 to 14 V
CHECK INTERMITTENT PROBLEMS