TOYOTA AVENSIS 2005 Service Repair Manual

± 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
F42646
Malfunction Code (Example Code 73)
7 3
ON
OFF
0.5 sec.
0.5 sec.
0.5 sec. 4 sec.
Repeat
0.5 sec.
ON
OFF
0.25 sec.
0.25 sec.
Normal Code
A Cycle 1.5 sec.
05±1048
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
5.INPUT SIGNAL CHECK (TEST MODE) (USING SST CHECK WIRE)
(a)Check the input signal using a SST check wire.
(1)Using SST, connect terminals Ts and CG of DLC3.
SST09843±18040
(2)Turn the ignition switch to ON.
(3)Check that the PS warning light shows the normalcode.
(4)Check that the PS warning light goes off while driv- ing the vehicle more than 10 km/h (6 mph) and the
engine speed more than 300 rpm.
HINT:
If the PS warning light goes off during driving, the sensor is
judged to be normal.
(5)Stop the vehicle.
(6)Using SST, connect terminals Tc and CG of DLC3.
SST09843±18040
(7)Read the number of blinks of the PS warning light.
HINT:

See the list of DTC shown in the table below.

Even if a sensor is normal, it output codes 71 and 73 dur-
ing 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
(8) After checking, disconnect the SST from the termi-
nal Ts and CG, Tc and CG of DLC3, and turn the
ignition switch to OFF.
SST 09843±18040

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.

±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1051
AVENSIS REPAIR MANUAL (RM1018E)
9.REPLACE POWER STEERING ECU ASSY
NOTICE:
Thoroughly check the procedures for removing and instal-
ling the power steering ECU assy when replacing it. Do the
same operation or procedure for the removing and instal-
ling the steering column assy.
(a)Remove the power steering ECU assy (See page
50±20).
(1) Mark the clamp position on the torque sensor wireharness in order to reinstall the wire harness as
shown in the illustration.
(2) Disconnect the torque sensor wire harness from the
clamp.
NOTICE:
In case the clamp will be reused, pay attention so as not to
damage it. (3) Disconnect the connectors.
(4) LHD:Remove the 2 bolts, screw and power steering ECU
assy.
(5) RHD: Remove the 2 bolts, 2 screws and power steering
ECU assy.

F44857
LHD:RHD:
Torque Sensor Wire Harness Clamp
Marks
Power Steering ECU Assy
Front
Motor Wire Harness
Torque Sensor
Wire Harness
Front
Torque Sensor
Wire Harness
Motor Wire Harness
Power Steering ECU Assy
Torque Sensor Wire Harness Clamp
Marks
Screw
Bolt A
Bolt A
Bolt B
Bolt B
Screw
05±1052
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
(b)Install the power steering ECU assy (See page 50±20).
(1) LHD:Install the power steering ECU assy with the 2 bolts
and screw.
Torque:
Bolt A: 8.0 N
m (82 kgf
cm, 71 in.
lbf)
Bolt B: 15.5 N
m (158 kgf
cm, 11 ft
lbf)
(2) RHD: Install the power steering ECU assy with the 2 bolts
and 2 screws.
Torque:
Bolt A: 8.0 N
m (82 kgf
cm, 71 in.
lbf)
Bolt B: 15.5 N
m (158 kgf
cm, 11 ft
lbf)
(3) Connect the connectors.

± 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.

050Y7±04
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InLicence No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs
ContinuousIntermittent ( times a day)
Steering operation is heavy.
Steering force to the right and left differs, or steering force is uneven.
PS Warning Light
AbnormalRemains ONDoes not come on
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
EMPS Check Sheet
While running, the steering force does not alter corresponding the vehicle
speed.
Vibration or strange sound comes from the steering column assy.
A malfunction code is outputed at the first time, record the freeze frame data as well (as the DTCs). Freeze Frame Data
When a trouble happens
(
During turningDuring vehicle stopAlways)
OthersCooled Warmed up
/ /Engine() Vehicle Model
The steering returns unwell.
Production Date VIN 05±1044
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
CUSTOMER PROBLEM ANALYSIS CHECK

050Y2±04
05±1042
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
ELECTRONIC MOTOR POWER STEERING SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following pages\
.
HINT:

See the indicated pages for detailed explanation.

The hand±held tester can be used at step 3, 6, 9, 12.
1VEHICLE BROUGHT TO WORKSHOP
2CUSTOMER PROBLEM ANALYSIS(See page 05±1044)
3 CHECK AND CLEAR DTCS AND FREEZE FRAME DATA
(a)After the completion of the DTC and freeze frame data check, clear the DTCs (See page 05±1045).
4 PROBLEM SYMPTOM CONFIRMATION
SYMPTOM DOES NOT OCCUR(Go to step 5)
SYMPTOM OCCURS(Go to step 6)
5SYMPTOM SIMULATION(See page 01±22)
6DTC CHECK(See page 05±1045)
NORMAL CODE(Go to step 7)
MALFUNCTION CODE(Go to step 8)
7PROBLEM SYMPTOMS TABLE(See page 05±1058)
8DTC CHART(See page 05±1054)

±
DIAGNOSTIC SELECTRONI C MO TOR POWER STEERING SYSTEM
05±1043
A VENSIS RE PAIR MANUAL (RM1018E)
9 CIRCUIT INSPECTION( See page 05±1059 to 05±1086 )
10 IDENTIFYING PROBLEMS 11 REPAIR
12 CONFIRMATION TEST
END