TOYOTA AVENSIS 2005 Service Repair Manual

F44856
ECU±IG
Fuse Driver Side J/B:
F44851
PGND (±)
E14
05±1074
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
NOTICE:
When performing the inspection of power steering ECU, ECU must be installed to the vehicle or fully
fixed.
1 INSPECT FUSE(ECU±IG)
(a) Remove the ECU±IG fuse from the driver side J/B.
(b) Check the continuity of the ECU±IG fuse.
Standard:
Continuity
NG INSPECT FOR SHORT CIRCUIT IN ALL
HARNESS AND COMPONENTS CONNECTED
TO ECU±IG FUSE
OK
2 CHECK HARNESS AND CONNECTOR(POWER STEERING ECU ASSY ± BODY
GROUND)
(a) Disconnect the E14 connector from the power steering
ECU assy.
(b) Measure the resistance between terminal PGND of E14
connector and body ground.
Standard:
Resistance: 1
or less
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK

F44855
PGNDE14
IG E15
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1075
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(POWER STEERING ECU ASSY ± DRIVER
SIDE J/B)
(a)Disconnect the E14 and E15 connectors from the power
steering ECU assy.
(b)Turn the ignition switch ON.
(c)Measure the voltage between terminals IG and PGND of the E14 and E15 connectors.
Standard:
Voltage: 10 to 16 V
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE POWER STEERING ECU ASSY (See page 50±20)

F44865
ECMPower Steering ECU
TACH E95
(*1) GR±R
(*2) (*1) (*2)GR±R
J9A
J27B
J9A
J27B
E1512
*1: LHD
*2: RHDJ/C
TACH 05±1070
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC C1544/44 Engine Revolution Signal Malfunction
DTC C1545/45 Engine Revolution Signal Malfunction
DTC C1573/73 Engine Revolution Signal Malfunction (Test
Mode)
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1544/44Engine revolution signal malfunction
Engine revolution signal circuit
C1545/45Engine revolution signal malfunction
Engine revolution signal circuit

ECM
C1573/73Engine revolution signal malfunction (Test mode)
Power steering ECU assy
WIRING DIAGRAM
0579M±02

±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1071
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 turn the hand±held tester main swi\
tch to ON.
(c)Select the item ºENGINE REVº in the DATA LIST and read its value displayed on the hand±held tester.
(d)Check that there is no difference between the engine revolution value output from the tachometer d\
is-
played by the hand±held tester and the engine revolution value displayed by\
the tachometer when
engine is idle.
OK:
There is almost no difference in the displayed engine revolution values.\
HINT:
There is tolerance of
10 % in the tachometer indication.
OKREPLACE POWER STEERING ECU ASSY(Seepage 50±20)
NG
2 CHECK DIAGNOSTIC CODE OUTPUT
(a) Check that the DTC for engine output the normal code. NG REPAIR CIRCUIT INDICATED BY OUTPUTCODE
OK

F44304
PGNDE14TACH
E15


A05138
5 V/
Division
10 ms / Division
05±1072
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT POWER STEERING ECU ASSY(ENGINE REVOLUTION SIGNAL)
(a)Turn the ignition switch ON.
(b)Connect an oscilloscope to terminals TACH and PGND of the power steering ECU assy connector.
(c)With the engine idling, check the signal waveform. Standard:
Signal waveform as shown in the illustration.
HINT:
As the engine revolution becomes high, the waveform cycle
narrows.
OKREPLACE POWER STEERING ECU ASSY(See page 50±20)
NG
4 CHECK HARNESS AND CONNECTOR(POWER STEERING ECU ASSY ± ECM)
(a) Check for an open or short circuit in harness and connector between powe\
r steering ECU assy and ECM (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
GO TO ENGINE CONTROL SYSTEM

F44865
Combination Meter Power Steering ECU
C11V±W 18
SPD J10H
J10H
J20H
J20H
E155
V±W
(*1) (*2) (*1) (*2)
*1: LHD
*2: RHDJ/C
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
05±1067
AVENSIS REPAIR MANUAL (RM1018E)
DTC C1541/41 Speed Sensor Malfunction
DTC C1542/42 Speed Sensor Malfunction
DTC C1571/71 Speed Sensor Malfunction (Test mode)
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1541/41
Speed sensor malfunction

Speed sensor

Speed sensor circuit
C1542/42
Speed sensor malfunction
Speed sensor circuit

Skid control ECU assy
Cbiti tC1571/71Speed sensor malfunction (Test mode)
Combination meter assy

Power steering ECU assy
WIRING DIAGRAM
0579L±02

05±1068
±
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 turn the hand±held tester main swi\
tch to ON.
(c)Select the item ºSPDº in the DATA LIST and read its value displayed on the hand±held tester.
(d)Check that there is no difference between the speed value output from the speedometer displayed by the hand±held tester and the speed value displayed by the speedometer wh\
en driving the vehicle.
OK:
There is almost no difference in the displayed speed values.
HINT:
There is tolerance of
10 % in the speedometer indication.
OKREPLACE POWER STEERING ECU ASSY(Seepage 50±20)
NG
2 CHECK DIAGNOSTIC CODE OUTPUT
(a) Check that DTC for brake system output the normal code. NG REPAIR CIRCUIT INDICATED BY OUTPUTCODE
OK

F44304
PGNDE14SPD
E15


A05135
5 V/
Division
20 ms/Division
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1069
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT POWER STEERING ECU ASSY(METER SPEED SIGNAL)
(a)Turn the ignition switch ON.
(b)Connect an oscilloscope to terminals SPD and PGND of
the power steering ECU assy connector.
(c)Driving at about 20 km/h (12 mph), check the signal wave- form.
Standard:
Signal waveform as shown in the illustration.
HINT:
As the vehicle speed becomes high, the waveform cycle nar-
rows.
OKREPLACE POWER STEERING ECU ASSY(See page 50±20)
NG
4 CHECK HARNESS AND CONNECTOR(POWER STEERING ECU ASSY ± COMBINATION METER ASSY)
(a) Check for an open or short circuit in harness and connector between powe\
r steering ECU assy and
combination meter assy (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
GO TO COMBINATION METER SYSTEM(See page 05±1510)

05±1066
±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTCC1531/31EMPS ECU Circuit Malfunction
DTCC1532/32EMPS ECU Circuit Malfunction
DTCC1533/33EMPS ECU Circuit Malfunction
DTCC1534/34EMPS ECU Circuit Malfunction
DTCC1581/81Assist Map Un±written
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1531/31
C1532/32PoersteeringECUassmalfnctionC1533/33Power steering ECU assy malfunctionPower steering ECU assy
C1534/34
gy
C1581/81Assist map un±written
INSPECTION PROCEDURE
1RECONFIRM DTC
(a)Check the DTCs (See page 05±1045).
(b) Is DTC except for C1531/31, C1532/32, C1533/33, C1534/34 and/or C1581/81\
output? YES REPAIR CIRCUIT INDICATED BY OUTPUTCODE
NO
REPLACE POWER STEERING ECU ASSY (See page 50±20)
050WS±04

I35378
A23
Air Mix Control Servo Motor (Driver Side) A/C Control Assembly
M
MAX
HOT4P±L
A15 AMDH12
MAX
COOL5B
A15 AMDC11
PT 3GR
A16 TPD8
VZ 2Y±B
A16 S5±22
GND 1Y±R
A15 SG±214
± DIAGNOSTICSAIR CONDITIONING SYSTEM
05±1139
AVENSIS REPAIR MANUAL (RM1018E)
DTC 46 AIR MIX DAMPER CONTROL SERVOMOTOR
CIRCUIT (DRIVER SIDE)
CIRCUIT DESCRIPTION
The air mix damper servo sub±assy is controlled by the A/C amplifier and moves the air mix damper to the
desired position.
DTC No.Detection ItemTrouble Area
46Air mix damper position sensor value does not change even if
A/C amplifier operated air mix damper control servomotor.

Air mix damper servo sub±assy (air mix damper control )

Harness or connector between air mix damper servo sub±
assy (air mix damper control servomotor) and A/C amplifier

A/C amplifier assy
WIRING DIAGRAM
05A8A±02