steering wheel TOYOTA AVENSIS 2005 Service Owner's Guide

05±1060
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
NOTICE:
When performing the inspection of power steering ECU, ECU must be instal\
led to the vehicle or fully
fixed.
HINT:
Start the inspection from the step 1 with using hand±held tester. Start from step 2 without using hand±held
tester.
1READ VALUE OF HAND±HELD TESTER
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch to ON and push the hand±held tester main swit\
ch ON.
(c)Select the item ºTRQ1º and ºTRQ2º in the DATA LIST and read its value displayed on the hand±held tester.
(d)Check the values on the ºTRQ1º and ºTRQ2º of the data monito\
r with the steering wheel being in the center value position (no load).
Standard:
2.3 to 2.7 V
(e)Check the difference of the values between ºTRQ1º and ºTRQ2º with the steering wheel being in the center value position (no load).
Standard:
Voltage: 0.3 V or less
(f)Check the values of the torque sensor on the data monitor when turning s\
teering wheel. (1)Turn the steering wheel to the right end from the center value position, and check the values on\
the ºTRQ1º and ºTRQ2º of the data monitor.
Standard:
2.5 to 4.7 V
(2)Turn the steering wheel to the left end from the center value position, and \
check the values on the ºTRQ1º and ºTRQ2º of the data monitor.
Standard:
0.3 to 2.5 V
(3)Check the difference of the values between ºTRQ1º and ºTRQ2º.
Standard:
Voltage: 0.3 V or less
NGGo to step 3
OK
REPLACE POWER STEERING ECU ASSY (See page 50±20)

050WP±04
05±1058
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still o\
ccurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the releva\
nt troubleshooting page.
SymptomSuspected AreaSee page
At the time of idling, steering control force is great.
1. Check the DTC reconfirming that the normal code is output.
2. IG Power source circuit
3. Front tire (Worn or improperly inflated)
4. Front wheel alignment (Incorrect)
5. Steering column assy
6. Power steering ECU assy05±1045
05±1073 28±1
26±6
50±9
01±32
Even if the vehicle speed is increased, appropriate steering resis-
tance cannot be felt.
1. Check the DTC reconfirming that the normal code is output.
2. Combination meter assy
3. Steering column assy
4. Power steering ECU assy05±1045
71±2150±9
01±32
P/S warning light faulty.1. P/S warning light circuit
2. Power steering ECU assy05±1082
01±32
DTC check cannot be done.
1. P/S warning light circuit
2. Tc terminal circuit
3. Power steering ECU assy05±1082
05±108401±32
Input signal check cannot be done.
1. Ts terminal circuit
2. Power steering ECU assy
3. Combination meter assy05±108601±32
71±21
Unusual noise.
1. Steering column assy
2. Power steering ECU assy
3. Steering gear assy50±9
01±32
51±28

050WO±04
F44303
E14
Connector AE15
Connector B
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
05±1057
AVENSIS REPAIR MANUAL (RM1018E)
TERMINALS OF ECU
POWER STEERING ECU ASSY
NOTICE:
When performing the inspection of power steering ECU, ECU must be installed to the vehicle or fully
fixed.
Symbols (Terminal No.)Wiring ColorConditionSpecified condition
PIG (E14±1) ± PGND (E14±2)L ± W±BIG switch ON10 to 16 V
PGND (E14±2) ± Body GroundW±B ± Body
GroundAlwaysBelow 1.0 V
M1 (A 1) PGND (E14 2)WBIG switch ON, turn the steering wheel to leftBelow 1.0 VM1 (A±1) ± PGND (E14±2)± ± W±BIG switch ON, turn the steering wheel to right10 to 16 V
M2 (A 2) PGND (E14 2)WBIG switch ON, turn the steering wheel to left10 to 16 VM2 (A±2) ± PGND (E14±2)± ± W±BIG switch ON, turn the steering wheel to rightBelow 1.0 V
SIL (E15±2) ± PGND (E14±2)W±G ± W±BIG switch ON10 to 16 V
RLY (E15±3) PGND (E14±2)W±R ± W±BIG switch ON, after 1 sec. or moreBelow 2.0 V
Tc (E15 4) PGND (E14 2)WL WBIG switch ON5 to 16 VTc (E15±4) ± PGND (E14±2)W±L ± W±BIG switch ON, short circuit Tc and CG terminals of DLC3Below 1.0 V
SPD (E15±5) ± PGND (E14±2)V±W ± W±BIG switch ONPulse generation
IG (E15±6) ± PGND (E14±2)R±W ± W±BIG switch ON10 to 16 V
IDUP (E15±8) ± PGND (E14±2)GR ± W±BIG switch ON5 to 16 V
WL (E15 9) PGND (E14 2)BW WBIG switch ON, P/S warning light goes off10 to 16 VWL (E15±9) ± PGND (E14±2)B±W ± W±BIG switch ON, P/S warning light comes onBelow 1.0 V
Ts (E15 11) PGND (E14 2)WWBIG switch ON5 to 16 VTs (E15±11) ± PGND (E14±2)W ± W±BIG switch ON, short circuit Ts and CG terminals of DLC3Below 1.0 V
TACH (E15±12) ± PGND
(E14±2)GR±R ± W±BIG switch ONPulse generation
TRQ1 (B±5) ± PGND (E14±2)± ± W±BIG switch ON, turn the steering wheel to left and right0.3 to 4.7 V
TRQV (B±6) ± PGND (E14±2)± ± W±BIG switch ON7.5 to 8.5 V
TRQ2 (B±7) ± PGND (E14±2)± ± W±BIG switch ON, turn the steering wheel to left and right0.3 to 4.7 V
TRQG (B±8) ± PGND (E14±2)± ± W±BIG switch ONBelow 1.0 V

C52361
DLC3:
CGTs 05±1046
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
(b) Clearing the DTCs using the SST check wire.
SST 09843±18040
(1) Using SST, connect terminals Ts and CG of the
DLC3.
(2) Turn the ignition switch to ON.
(3) Disconnect and connect the SST check wire from
the CG terminal 4 times or more in 8 seconds end-
ing with it connected.
(4) Check that the P/S warning light blinks a normal
code.
(5) Turn the ignition switch to OFF.
(6) Remove the SST from the DLC3.
SST 09843±18040
3. DTC CHECK (USING HAND±HELD TESTER)
(a) Checking DTCs using the hand±held tester.
(1) Connect the hand±held tester to the DLC3.
(2) Turn the ignition switch to ON.
(3) Read the DTCs by following the prompts on the tes-
ter screen.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
(b) Clearing the DTCs using the hand±held tester.
(1) Connect the hand±held tester to the DLC3.
(2) Turn the ignition switch to ON.
(3) Clear the DTCs by following the prompts on the tes-
ter screen.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
4. DATA LIST AND FREEZE FRAME DATA
HINT:
Ignition switch must be turned ON, and the vehicle should be placed on a leveled ground to observe data
by using a hand±held tester.
Data List (*: with freeze frame data):
ItemMeasurement Item / Range (Dis-
play)Normal ConditionDiagnostic Note
TRQ1 (*)
Show the output states in the
torque sensor /
Min.: 0 V, Max.: 5 V
Steering wheel center position:
2.3 to 2.7 V
Steering wheel right turned:
2.5 to 4.7 V
Steering wheel left turned:
0.3 to 2.5 V
±
TRQ2 (*)
Show the output states in the
torque sensor /
Min.: 0 V, Max.: 5 V
Steering wheel center position:
2.3 to 2.7 V
Steering wheel right turned:
2.5 to 4.7 V
Steering wheel left turned:
0.3 to 2.5 V
±

± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
05±1047
AVENSIS REPAIR MANUAL (RM1018E)ItemDiagnostic Note Normal Condition Measurement Item / Range (Dis-
play)
TRQ3 (*)
Show the output states in the
torque sensor /
Min.: 0 V, Max.: 5 V
Steering wheel center position:
2.3 to 2.7 V
Steering wheel right turned:
2.5 to 4.7 V
Steering wheel left turned:
0.3 to 2.5 V
±
SPD (*)
Show the vehicle speed on the
speedometer /
Min.: 0 km/h (0 mph),
Max.: 255 km/h (158 mph)
Actual vehicle speedVehicle speed indicated on
speedometer
ENGINE REV (*)
Show the engine revolution /
Min.: 0 rpm
Max.: 8,192 rpm
Actual engine speed±
MOTOR ACTUAL (*)Show the current flowing motor /
Min.: ±128 A, Max.: 128 A0 to 65 A±
COMMAND VALUE (*)Show the specified current value /
Min.: ±128 A, Max.: 128 A0 to 65 A±
THERMISTOR TEMP (*)
Show the temperature of the
thermistor /
Min.: ±50
C, Max.: 205
C
±±
PIG SUPPLY (*)
Show the power supply voltage for
driving motor /
Min.: 0 V, Max.: 25 V
10 to 16 VWhile power steering operated
IG SUPPLY (*)Show the power supply condition /
Min.: 0 V, Max.: 25 V10 to 16 V±
TRQ1 ZERO VAL (*)Show the torque sensor/
Min.: 0 V, Max.: 5 VSteering wheel center position:
2.3 to 2.7 V±
TRQ2 ZERO VAL (*)Show the torque sensor/
Min.: 0 V, Max.: 5 VSteering wheel center position:
2.3 to 2.7 V±
TRQ3 ZERO VAL (*)Show the torque sensor/
Min.: 0 V, Max.: 5 VSteering wheel center position:
2.3 to 2.7 V±
MTR OVERHEAT
Record of continuous overheat
preventive control /
record or un±record
Un±record±
MTR LOW POWERRecord of low motor power supply
voltage / record or un±recordUn±record±
MTR HIGH POWERRecord of high motor power sup-
ply voltage / record or un±recordUn±record
#CODESNumber of DTC recorded /
Min.: 0, Max.: 255Min.: 0, Max.: XX±
ASSIST MAPShow the selected condition of the
assist map / 01, 02, 03, 11 or 12±±
ECU IDShow the identified information of
ECU / 01, 02, 03, 04 or 05±±
TEST MODE STATTest mode status / NORMAL or
TESTNORMAL: Normal mode
TEST: During test mode±

C52361
DLC3:CGTs
Tc
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1049
AVENSIS REPAIR MANUAL (RM1018E)
6.INPUT SIGNAL CHECK (TEST MODE)
(USING HAND±HELD TESTER)
(a)Check the input signal using the hand±held tester.
(1)Connect the hand±held tester to the DLC3.
(2)Check that the warning light goes off with driving thevehicle more than 10 km/h (6 mph) and engine
speed more than 300 rpm.
(3)Read the DTC by following the prompts on the tes- ter screen.
HINT:

Refer to the hand±held tester operator's manual for fur-
ther details.

See the list of DTC shown in the table below.

Even if a sensor is normal, it outputs codes C1571/71 and
C1573/73 during test mode.
DTC of input signal check function:
Code No.
(See page)DiagnosisTrouble Area
C1571/71
(05±1067)Speed sensor signal check 1 (Test mode)

Speed sensor

Speed sensor circuit

Skid control ECU assy

Combination meter assy

Power steering ECU assy
C1573/73
(05±1070)Engine revolution signal check (Test mode)

Engine revolution signal circuit

ECM

Power steering ECU assy
7. CALIBRATION OF TORQUE SENSOR ZERO POINT
(USING SST CHECK WIRE)
HINT:
Perform this operation in the following cases.

When removing and installing ºsteering wheel assemblyº,
ºtilt steering column assemblyº and ºsteering gear assem-
blyº.

When replacing power steering ECU assy.
(a) Place front wheels and steering wheel facing straight ahead.
(b) Perform the torque sensor zero point initialization.
HINT:
If the power steering ECU assy is replaced, initialization is not
necessary. (1) Stop the vehicle and turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and CG of DLC3.
SST 09843±18040
(3) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18040
(4) Turn the ignition switch ON.

C52361
DLC3:
CGTs 05±1050
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
(5) Disconnect and connect the terminal Tc of DLC3 20
times within 20 seconds.
(6) Check the DTC C1515/15 output.
(c) Perform the torque sensor zero point calibration.
HINT:

Do not touch the steering wheel.

Check that the DTC for except C1515/15 is not output.
(1) Stop the vehicle and turn the ignition switch to OFF.
(2) Using SST, connect terminals Ts and CG of DLC3
and turn the ignition switch to ON.
SST 09843±18040
(3) Disconnect the SST.
SST 09843±18040
(4) Check the DTC is not output.
8. CALIBRATION OF TORQUE SENSOR ZERO POINT
(USING HAND±HELD TESTER)
HINT:
Perform this operation in the following cases.

When removing and installing ºsteering wheel assemblyº,
ºtilt steering column assemblyº and ºsteering gear assem-
blyº.

When replacing power steering ECU assy.
(a) Place front wheels and steering wheel facing straight
ahead.
(b) Perform the torque sensor zero point initialization.
HINT:
If the power steering ECU assy is replaced, initialization is not
necessary.
(1) Stop the vehicle.
(2) Connect the hand±held tester to the DLC3.
(3) Select the ºTRQ SENS ADJUSTº mode on the
hand±held tester.
(4) Select the ºZERO POINT INITIALIZEº.
(5) Following the screen instructions, perform the
torque sensor zero point initialization.
(c) Perform the torque sensor zero point calibration.
HINT:
Do not touch the steering wheel.
(1) Connect the hand±held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) Select the ºTRQ SENS ADJUSTº mode on the
hand±held tester.
(4) Select the ºZERO POINT ADJUSTº.
(5) Following the screen instructions, perform the
torque sensor zero point calibration.

± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
05±1053
AVENSIS REPAIR MANUAL (RM1018E)
(4) Align the marks on the torque sensor wire harness
with the clamp, as shown in the illustration.
NOTICE:

When reusing the clamp, check that there is no dam-
age on it.

When reinstalling the wire harness, make sure there
is no twist in the harness or with other wire harness.
10. FAIL SAFE FUNCTION
(a) If the power steering ECU assy detects a trouble, the ECU
assy halt, fix or lower the steering power assist in order to
protect the system.
HINT:
Repeating the steering operation when stopping or driving at
low speed, or leaving the steering wheel turn fully for long hours
will lower the amount of power assist in order to prevent power
steering ECU assy from heating up. In this case, not operating
the steering for about 10 minutes with engine idle will lead the
fail safe function to return the normal state.

I35662
AU1
AU2 EAU
± DIAGNOSTICSAUDIO SYSTEM
05±1433
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT STEERING WHEEL ASSY(AU1, AU2, EAU)
(a) Remove the steering pad switch LH.
(b) Check continuity between terminals at each condition, as
shown in the chart.
Standard:
Tester connectionConditionSpecified condition
AU1 ± EAUDo not switch positionApprox. 100 k

AU1 ± EAUSEEK+ switch: push0

AU1 ± EAUSEEK± switch: pushApprox. 0.3 k

AU1 ± EAUVOL+ switch: pushApprox. 1 k

AU1 ± EAUVOL± switch: pushApprox. 3.2 k

AU1 ± EAUDo not switch positionApprox. 100 k

AU1 ± EAUMODE switch: push0

NG REPLACE STEERING WHEEL ASSY
OK


I37571
Steering Wheel Assy:Radio Receiver Assy:
SW2
EAU AU2AU1
SW1
GND
05±1434
±
DIAGNOSTICS AUDIO SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
2CHECK HARNESS AND CONNECTOR(STEERING WHEEL ASSY ± RADIO RECEIVER ASSY)
(a)Disconnect the connectors from the steering wheel assy
and radio receiver assy.
(1)Check continuity between terminals at each condi-tion, as shown in the chart.
Standard:
Tester connectionSpecified condition
SW1± ± AU1Continuity
SW2 ± AU2Continuity
GND ± EAUContinuity
(2)Check for a short between terminals at each condi- tion, as shown in the chart.
Standard:
Tester connectionSpecified condition
SW1 ± Body groundNo continuity
SW2 ± Body groundNo continuity
GND ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR (See page 01±32)
OK
REPLACE RADIO RECEIVER ASSY