display TOYOTA RAV4 2006 Service Manual Online

PS–12POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
(3) Read and write down any DTCs indicated by the
P/S warning light on the combination meter.
Refer to the chart below for examples of a
normal code and DTCs 21 and 22.
HINT:
• If the P/S warning light does not blink to
display any DTCs set or the normal code,
inspect the circuit shown in the table below.
• If two or more malfunctions are detected
simultaneously, DTCs will be displayed in
ascending numerical order.
(4) Refer to the Diagnostic Trouble Code Chart (See
page PS-16) for DTC information.
2. CLEAR DTC
(a) When using intelligent tester:
(1) Connect the intelligent tester (with CAN VIM) to
the DLC3.
(2) Turn the ignition switch ON and press the
intelligent tester main switch ON.
(3) Clear the DTCs by following the prompts on the
intelligent tester.
(4) Turn the ignition switch OFF.
(5) Disconnect the intelligent tester from the DLC3.
B128060E02
Trouble Area See Page
EPS warning light circuitPS-37

PS–14POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
FREEZE FRAME DATA
1. FREEZE FRAME DATA
NOTICE:
• It is difficult to show the specified values
(judgment values) clearly because freeze frame
data values change significantly due to
differences in measurement conditions,
surroundings, or vehicle conditions. For this
reason, there may be a problem even when the
values are within specifications.
• Turn the ignition switch ON and park the vehicle
on level ground. Check the freeze frame data by
using intelligent tester.
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON and check the freeze
frame data by following the prompts on the
intelligent tester display.
Power steering ECU
Item Item Description: Range
(Display)Inspection Condition Reference Value
BATTERY VOLTAGE Battery voltage:
Min.: 0 V
Max.: 25.5 V- 10 to 14 V
SPD Vehicle speed from meter:
Min.: 0 km/h (0 mph)
Max.: 300 km/h (187.5 mph)Vehicle stopped 0 km/h (mph)
Vehicle driven at constant speedNo significant fluctuation
ENGINE REV Show the engine revolution:
Min.: 0 rpm
Max.: 12800 rpmEngine is running at a constant
speedNo significant fluctuation
MOTOR ACTUAL Amount of current to motor:
Min.: -327.68 A
Max.: 327.67 APower steering is in operationValue changes in proportion to
steering effort
COMMAND VALUE Demanded amount of current to
motor:
Min.: -327.68 A
Max.: 327.68 APower steering is in operationValue changes in proportion to
steering effort
STR ANGL VEL Steering angle speed:
Min.: -32768
/sec.
Max.: 32767/sec.Steering wheel is turned Value changes in proportion to
steering effort
STEERING TORQUE Steering wheel torque:
Min.: -7 Nm
Max.: 7 Nm--
THERMISTOR TEMP ECU substrate temperature:
Min.: -40
C
Max.: 150
CIgnition switch ON -
PIG SUPPLY Power source voltage to activate
motor:
Min.: 0 V
Max.: 20.1531 VPower steering in operation 10 to 14 V
IG SUPPLY ECU power source voltage:
Min.: 0 V
Max.: 20.1531 VIgnition switch ON 10 to 14 V
MOTOR ROTATE Motor rotation angle:
Min.: 0
Max.: 360
Power steering in operation During steering operation, motor
rotation angle value changes from
0 to 360
MOTOR VOLTAGE Motor power supply voltage:
0 V
Max.: 45.955 VPower steering in operation -

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–15
PS
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.)
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.)
PS ASSIST SIG Power steering assist signal:
ON or OFF-- Item Item Description: Range
(Display)Inspection Condition Reference Value

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–17
PS
DATA LIST / ACTIVE TEST
1. READ DATA LIST
HINT:
Using the intelligent tester's DATA LIST allows switch,
sensor, actuator and other item values to be read without
removing any parts. Reading the DATA LIST early in
troubleshooting is one way to save time.
(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) Read the DATA LIST by following the directions on
the tester screen.
Tester Display Measurement Item/Range Normal Condition Reference Value
BATTERY VOLTAGE Battery voltage:
Min.: 0 V
Max.: 25.5 V- 10 to 14 V
SPD Vehicle speed from meter:
Min.: 0 km/h (0 mph)
Max.: 300 km/h (187.5 mph)Vehicle stopped 0 km/h (0 mph)
Vehicle driven at constant speed No significant fluctuation
SPD SIG INVALID Record of vehicle speed signal
invalid:
REC or UNREC- UNREC
ENGINE REV Show the engine revolution:
Min.: 0 rpm
Max.: 12800 rpmEngine is running at a constant
speedNo significant fluctuation
ENG REV INTER Record of engine revolution
signal interruption
REC or UNREC- UNREC
MOTOR ACTUAL Amount of current to motor:
Min.: -327.68 A
Max.: 327.67 APower steering is in operation Value changes in proportion to
steering effort
COMMAND VALUE Demanded amount of current to
motor:
Min.: -327.68 A
Max.: 327.68 APower steering is in operation Value changes in proportion to
steering effort
STR ANGL VEL Steering angle speed:
Min.: -32768
/sec.
Max.: 32767
/sec.Steering wheel is turned Value changes in proportion to
steering effort
STEERING TORQUE Steering wheel torque:
Min.: -7 Nm
Max.: 7 Nm--
THERMISTOR TEMP ECU substrate temperature:
Min.: -40
C
Max.: 150
CIgnition switch ON -
PIG SUPPLY Power source voltage to activate
motor:
Min.: 0 V
Max.: 20.1531 VPower steering in operation 10 to 14 V
IG SUPPLY ECU power source voltage:
Min.: 0 V
Max.: 20.1531 VIgnition switch ON 10 to 14 V
MTR OVERHEAT Continuous overheat prevention
control record:
REC or UNREC- UNREC
MTR LOW POWER PIG power source voltage drop
record:
REC or UNREC- UNREC

PS–18POWER STEERING – ELECTRONIC POWER STEERING SYSTEM
PS
2. PERFORM ACTIVE TEST
HINT:
Performing the intelligent tester's ACTIVE TEST allows
relays, the VSV, actuators and other items to be
operated without removing any parts. Performing the
ACTIVE TEST early in troubleshooting is one way to
save time. The DATA LIST can be displayed in the
ACTIVE TEST.
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON and turn the intelligent
tester ON.
(c) Perform the ACTIVE TEST by following the prompts
on the tester.
Combination meter
MOTOR ROTATE Motor rotation angle:
Min.: 0
Max.: 360
Power steering in operation During steering operation, motor
rotation angle value changes from
0 to 360
MOTOR VOLTAGE Motor power supply voltage:
0 V
Max.: 45.955 VPower steering in operation -
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.)
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.)
IG ON/OFF TIMES Ignition switch ON/OFF number
of times after fail detection:
Min.: 0 times
Max.: 65535 times--
# CODES Number of detected DTCs when
freeze frame data stored:
Min.: 0
Max.: 255 --
PS ASSIST SIG Power steering assist signal:
ON or OFF-- Tester Display Measurement Item/Range Normal Condition Reference Value
Tester Display Test Part Control Range
EPS INDIC P/S indicator
ON/OFFConfirm that vehicle is stopped, engine idling

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–19
PS
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If any DTCs are displayed during the DTC check, inspect the
circuit listed for these DTCs. For details of each DTC, refer to
the page indicated in the DTC chart.
Electric Power Steering System
DTC No. Detection Item Trouble Area Normal Function
Return ConditionP/S Warning Light See page
C1511/11 Torque Sensor 1
Malfunction- Steering column
assembly (Torque
sensor)
- Power steering ECUIgnition switch ON
again
PS-18
C1512/11 Torque Sensor 2
Malfunction- Steering column
assembly (Torque
sensor)
- Power steering ECUIgnition switch ON
again
PS-18
C1513/11 Torque Sensor
Deviation Excessive- Steering column
assembly (Torque
sensor)
- Power steering ECUIgnition switch ON
again
PS-18
C1514/11 Torque Sensor Power
Supply Voltage
Malfunction- Steering column
assembly (Torque
sensor)
- Power steering ECUIgnition switch ON
again
PS-18
C1521/25 Short in Motor Circuit - Power steering ECU Ignition switch ON
again
PS-21
C1524/24 Motor Terminal
Voltage Malfunction- Steering column
assembly (Torque
sensor)
- Power steering ECUIgnition switch ON
again
PS-22
C1528/12 Motor Rotation Angle
Sensor Malfunction- Steering column
assembly (Torque
sensor)
- Power steering ECUIgnition switch ON
again
PS-24
C1531/25 ECU Malfunction - Power steering ECU Ignition switch ON
again
PS-26
C1532/25 ECU Malfunction - Power steering ECU Ignition switch ON
again
PS-26
C1533/25 Temperature Sensor
Circuit is Low or High- Power steering ECU Ignition switch ON
again or after normal
confirmation
PS-26
C1534/25 EEPROM
Malfunction- Power steering ECU Ignition switch ON
again
PS-26
C1551/25 IG Power Supply
Voltage Malfunction- ECU-IG1 fuse
- IG power source
circuit
- Power steering ECUIgnition switch ON
again or after normal
confirmation
PS-27
C1552/22 PIG Power Supply
Voltage Malfunction- PIG power source
circuit
- Power steering ECUIgnition switch ON
again or after normal
confirmation
PS-29
C1554/23 Power Supply Relay
Failure- PIG power source
circuit
- Power steering ECUIgnition switch ON
again
PS-31
C1555/25 Motor Relay Welding
Failure- Power steering ECU Ignition switch ON
again
PS-31
C1581/26 Assist Map Number
Un-Writing- Power steering ECU Assist map write or
ignition switch ON
again
PS-32
U0073/49 Control Module
Communication Bus
Off- CAN
communication
systemIgnition switch ON
again
PS-34

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

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

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