TOYOTA AVENSIS 2005 Service Repair Manual

F44868
Power Steering ECU Assy Torque Sensor
TRQV
TRQ1
TRQ2
TRQG 6
5
7
8
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
05±1059
AVENSIS REPAIR MANUAL (RM1018E)
DTC C1511/11 Torque Sensor Circuit Malfunction
DTC C1512/12 Torque Sensor Circuit Malfunction
DTC C1513/13 Torque Sensor Circuit Malfunction
DTC C1514/14 Torque Sensor Power Source Circuit
Malfunction
DTC C1517/17 Torque Sensor Hold Malfunction
CIRCUIT DESCRIPTION
The torque sensor converts the power input in the steering wheel into electric signals, and sends them to
the ECU.
DTC No.DTC Detecting ConditionTrouble Area
C1511/11
C1512/12Torque sensor circuit malfunction
C1513/13
q
Steering column assy

Power steering ECU assy
C1514/14Torque sensor power source circuit malfunction

Power steering ECU assy
C1517/17Torque sensor hold malfunction
WIRING DIAGRAM
05C5H±01

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)

F44304
TRQG (±)TRQ1 (+)Connector BTRQ2 (+)
F44304
TRQG (±) TRQV (+)
Connector B
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1061
AVENSIS REPAIR MANUAL (RM1018E)
2INSPECT STEERING COLUMN ASSY(TORQUE SENSOR)
(a)Measure the voltage between terminals TRQ1 and
TRQG, TRQ2 and TRQG of power steering ECU assy
connector.
Standard:
Steering positionTRQ1TRQ2
Center position2.3 to 2.7 V2.3 to 2.7 V
Right turned2.5 to 4.7 V2.5 to 4.7 V
Left turned0.3 to 2.5 V0.3 to 2.5 V
OKREPLACE POWER STEERING ECU ASSY (See page 50±20)
NG
3INSPECT POWER STEERING ECU ASSY
(a)Measure the voltage between terminals TRQV and TRQG of power steering ECU assy connector.
Standard:
7.5 to 8.5 V
OKREPLACE STEERING COLUMN ASSY (See page 50±9)
NG
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

050WN±04
F45950
Driver Side J/B ECU±IG FusePower Steering ECU assy Steering Column Assy
Engine Room R/B No.1 and
Engine Room J/B No.1
Combination Meter Assy
(P/S Warning Light)
DLC3EMPS
Fuse
EMPS Relay
05±1056
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
LOCATION

050WM±04
05±1054
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DIAGNOSTIC TROUBLE CODE CHART
HINT:

Using SST 09843±18040, connect terminals Tc and CG of the DLC3.

If a malfunction code is displayed during the DTC check, check the circuit\
listed for the code. For details
of each code, proceed the page referred to under the ºSee pageº for \
respective ºDTC No.º in the DTC
chart.
DTC No.
(See page)Detection ItemTrouble Area
C1511/11
(05±1059)
C1512/12
(05±1059)Torque sensor circuit malfunction
Steering column assy
C1513/13
(05±1059)
Steering column assy

Power steering ECU assy
C1514/14
(05±1059)Torque sensor power source circuit malfunction
C1515/15
(05±1062)Calibration of torque sensor zero point is not performedSensor zero point calibration is not preformed.
C1516/16
(05±1063)Calibration of torque sensor zero point is not completedSensor zero point calibration failure.
C1517/17
(05±1059)Torque sensor hold malfunction
Steering column assy

Power steering ECU assy
C1523/23
(05±1064)
Motor circuit malfunction
Steering column assy
C1524/24
(05±1064)Motor circuit malfunctionSteering column assy

Power steering ECU assy
C1531/31
(05±1066)
C1532/32
(05±1066)
Power steering ECU assy malfunctionPower steering ECU assyC1533/33
(05±1066)Power steering ECU assy malfunctionPower steering ECU assy
C1534/34
(05±1066)
C1541/41
(05±1067)
Speed sensor malfunction

Speed sensor

Speed sensor circuit

Skid control ECUC1542/42
(05±1067)Speed sensor malfunction
Skid control ECU

Combination meter assy

Power steering ECU assy
C1544/44
(05±1070)
Engine revolution signal malfunction

Engine revolution signal circuit
ECMC1545/45
(05±1070)Engine revolution signal malfunction
ECM

Power steering ECU assy
C1551/51
(05±1073)IG power source circuit malfunction

ECU±IG fuse

Power steering relay

IG power source circuit

Charging system

Power steering ECU assy
C1552/52
(05±1076)PIG power source circuit malfunction
EMPS fuse

EMPS rela
y
C1554/54
(05±1076)EMPS relay circuit malfunction

EMPS relay

PIG power source circuit

Power steering ECU assy

±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1055
AVENSIS REPAIR MANUAL (RM1018E)C1555/55
(05±1080)
EMPS motor relay circuit malfunctionPower steering ECU assy
C1581/81
(05±1066)Assist map un±writtenPower steering ECU assy

05C5F±01
F15799
C52361
DLC3:CG
Tc
F40045
Normal Code
0.25 sec.
0.25 sec.
ON
OFF
ON
OFF 0.5 sec.
0.5 sec.
Codes 21 and 22
1.5 sec.2.5 sec.
Code 21
Code 22
4 sec.0.5 sec.
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1045
AVENSIS REPAIR MANUAL (RM1018E)
PRE±CHECK
1.DIAGNOSIS SYSTEM
(a)Check the PS warning light.
(1)When the ignition switch is turned ON, check thatthe PS warning light goes on for 2 seconds.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the PS warning light circuit (See page 05±1082).
2.DTC CHECK (USING SST CHECK WIRE)
(a)Checking DTCs using a SST check wire. SST09843±18040
(1)Using SST, connect terminals Tc and CG of theDLC3.
(2)Turn the ignition switch to ON.
(3)Read and record any DTCs from the P/S warning light on the combination meter. Refer to the chart on
the left for examples of a normal code and codes 21
and 22.
HINT:

If the P/S warning light does not blink any DTC codes or
the normal code, inspect the circuit shown in the charts
below.
Trouble Area
Tc Terminal Circuit05±1084
P/S Warning Light Circuit05±1082

If 2 or more malfunctions are detected at the same time,
DTC will be displayed in the ascending order.
(4)Refer to the Diagnostic Trouble Code Chart (See page 05±1054) for DTC information.

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
±