2005 TOYOTA AVENSIS Circuit

05±1018±
DIAGNOSTICS ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT](U341E)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP1520STOP LIGHT SWITCH CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling while dr\
iving in lock±up condition, when
brakes are suddenly applied.
When the brake pedal is depressed, this switch sends signals to the ECM. Then\
the ECM cancels the opera-
tion of the lock±up clutch while braking is in progress.
DTC No.DTC Detection ConditionTrouble Area
P1520Stop light switch remains ON while vehicle running (1±trip
detection logic)
Short in stop lamp switch signal circuit

Stop lamp switch

ECM
WIRING DIAGRAM
See page 05±115.
INSPECTION PROCEDURE
1 INSPECT STOP LAMP SWITCH ASSY
NG REPLACE STOP LAMP SWITCH ASSY
OK
2 CHECK HARNESS AND CONNECTOR(STOP LAMP SWITCH ASSY ± ECM)
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ECM
05C8K±01

D26539
E1
ECT Solenoid
R
E12SLECM
13
LG
4
SL
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)05±1015
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0773 SHIFT SOLENOID ºEº ELECTRICAL (SHIFT
SOLENOID VALVE SL)
CIRCUIT DESCRIPTION
The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hydraulic pressure
acting on the lock±up relay valve, which then controls operation of the lock±up clutch.
Fail safe function:
If the ECM detects a malfunction, it turns the shift solenoid valve SL OFF.
DTC No.DTC Detecting ConditionTrouble Area
P0773
Either (a) or (b) is detected for 1 time.
(2±trip detection logic)
(a) Solenoid resistance is 8  or less when solenoid is ener-
gized.
(b) Solenoid resistance is 100 k or more when solenoid is not
energized.

Open or short in shift solenoid valve SL circuit

Shift solenoid valve SL

ECM
WIRING DIAGRAM
05687±06

Range
NORMALSHIFT SOLENOID VALVE
S1 MALFUNCTIONING
Solenoid valveS1 S2GearSHIFT SOLENOID VALVE
S2 MALFUNCTIONINGBOTH SHIFT SOLENOID
VALVES MALFUNCTIONINGSolenoid valve
S1 S2GearSolenoid valve
S1 S2GearGear when shift selector is
manually operated
D
2
1ON
ONON
OFF
OFF
OFF
OFF ON
ON
ONON
OFF
OFF OFF
ON
ON OFFON1st
2nd
3rd
O/D
1st
2nd
3rd
1st
2ndX
X
X
X
X
X
X
X
XOFF
OFF
ON
OFFOFF
OFF
OFF3rd 3rd
O/D
3rd
3rd
O/D
3rdX
X
X
X
X
X
X
X
X ON
ON OFF OFF
OFF
ON
ON2nd
2nd
2nd2nd3rd 3rd
3rd
2nd
2nd3rd 3rd 3rd
3rd
3rd 3rd
3rd
3rd
3rd
X: MalfunctionsOFF
OFF3rd
3rdON
ON
(S range)
(S range)
05±1010± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0753 SHIFT SOLENOID ºAº ELECTRICAL (SHIFT
SOLENOID VALVE S1)
DTC P0758 SHIFT SOLENOID ºBº ELECTRICAL (SHIFT
SOLENOID VALVE S2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF operation of the shift solenoid valves
S1 and S2 controlled by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM
controls the remaining normal solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail safe function:
If either of the solenoid valve circuits develops an open or short, the ECM turns the other solenoid valve ON
and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid valve
ST OFF at the same time. If both solenoids malfunction, hydraulic control cannot be performed electronically
and must be done manually.
Manual shifting as shown in the above table must be done (In the case of a short circuit, the ECM stops send-
ing current to the short circuited solenoid).
DTC No.DTC Detection ConditionTrouble Area
P0753
P0758
ECM checks for an open or short circuit in shift solenoid valve
S1 or S2 circuit when it changes
ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected:
(a) When solenoid is energized, solenoid resistance is 8
or
less and it is counted
(b) When solenoid is not energized, solenoid resistance is 100
k
or more and it is counted

Open or short in shift solenoid valve S1/S2 circuit

Shift solenoid valve S1/S2

ECM
HINT:
Check the shift solenoid valve S1 when DTC P0753 is output and check the shift solenoid valve S2 when
DTC P0758 is output.
05C8I±01

C54864
THOE2
±
DIAGNOSTICS ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT](U341E)05±1005
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0711TRANSMISSION FLUID TEMPERATURE
SENSOR CIRCUIT RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
The ATF temperature sensor converts the fluid temperature into a resistance v\
alue which is input into the
ECM.
DTC No.DTC Detection ConditionTrouble Area
P0711
Both (a) and (b) are detected: (2±trip detection logic)
(a)After 12 sec. of engine start, temp. of atmosphere and that
of engine coolant is more than ±10 C
(b)After normal driving for over 20 min. and 10 km, ATF temp.
is less than 10 C

Open or short in ATF temp. sensor circuit

Transmission wire (ATF temperature sensor)

ECM
WIRING DIAGRAM
See page 05±1003.
INSPECTION PROCEDURE
1 INSPECT TRANSMISSION WIRE(ATF TEMPERATURE SENSOR)
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure the resistance between terminals THO and E2.
OK:
Temperature: C ( F)Resistance: k

10 (50)6.4
110 (230)0.2
(c) Check the continuity between the wire harness side con-
nectors.
OK:
Standard (Check for a short):
SymbolsSpecified condition
THO ± Body groundNo continuityE2 ± Body groundNo continuity
NG REPAIR OR REPLACE TRANSMISSION WIRE
OK
05C8G±01

D26545
THO E2 BR
30
V E2 E1
ECT Solenoid
E13 O
THO OECM
28
E13
6
1
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)05±1003
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0710 TRANSMISSION FLUID TEMPERATURE
SENSOR CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The ATF temperature sensor converts the fluid temperature into a resistance value which is input into the
ECM.
DTC No.DTC Detection ConditionTrouble Area
P0710
Either (a) or (b) is detected for 0.5 sec. or more:
(1 trip detection logic)
(c) Temp. sensor resistance is less than 79

(d) After engine has been operating for 15 min. or
more, resistance at temp. sensor is more than 156 k


Open or short in ATF temp. sensor circuit

Transmission wire (ATF temperature sensor)

ECM
WIRING DIAGRAM
0567Z±06

0567W±10
05±1000±
DIAGNOSTICS ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT](U341E)
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
HINT:
If a normal code is displayed during the DTC check but the trouble still o\
ccurs, check the circuits for each
symptom in the order given in the charts on the following pages and proceed to \
the page given for trouble-
shooting.
The Matrix Chart is divided into 3 chapters.

If the instruction ºProceed to next circuit inspection shown on matri\
x chartº is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.

If the trouble still occurs even though there are no abnormalities in any of the other circuits, then ch\
eck
and replace the ECM.
CHAPTER 1: ELECTRONIC CIRCUIT MATRIX CHART
SymptomSuspect AreaSee page
No up±shift (A particular gear, from 1st to O/D gear, is not up±
shifted)ECM01±32
No down±shift (A particular gear, from O/D to 1st gear, is not
down±shifted)ECM01±32
No lock±up or No lock±up off
3. Stop light switch circuit
4. Engine coolant temp. sensor circuit
5. Throttle position sensor circuit
6. ECM05±1018
05±16
05±16
01±32
Shift point too high or too low
1. Engine coolant temp. sensor circuit
2. Throttle position sensor circuit
3. ECM05±16
05±16
01±32
No gear change by shifting into º+º or º±º while the shif\
t lever is in
the Sposition1. Transmission control switch circuit
2. ECM05±103501±32
Up±shift to O/D from 3rd while engine is cold
1. Engine coolant temp. sensor circuit
2. ATF temp. sensor circuit
3. ECM05±16
05±1003
05±1005 01±32
Harsh engagement (N
D)ECM01±32
Harsh engagement (Lock±up)ECM01±32
Harsh engagement (Any driving range)ECM01±32
Poor acceleration
1. Pattern select switch circuit (ECT SNOW switch)
2. Instrument panel J/B assy (Integration relay)
3. ECM05±1040
01±32
Engine stalls when starting off or stoppingECM01±32
No kick±down1. Kick±down switch circuit
2. ECM05±103301±32
No 2nd start
1. Pattern select switch circuit (ECT SNOW switch)
2. Transmission control switch circuit
3. Park/neutral position switch circuit
4. Instrument panel J/B assy (Integration relay)
5. ECM05±1040
05±1035
05±1024
05±104001±32

F40038
Power Steering ECU Assy
Power Steering MotorM1
M2 1
2 05±1064
± DIAGNOSTICSELECTRONIC MOTOR POWER STEERING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC C1523/23 Motor Circuit Malfunction
DTC C1524/24 Motor Circuit Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1523/23Short circuit of motor terminal or abnormal voltage or current in
Steering column assy
C1524/24
Short circuit of motor terminal or abnormal voltage or current in
motor circuit.
Steering column assy

Power steering ECU assy
WIRING DIAGRAM
050WR±04

±
DIAGNOSTICS ELECTRONIC MOTOR POWER STEERING SYSTEM
05±1063
AVENSIS REPAIR MANUAL (RM1018E)
DTCC1516/16Calibration of Sensor Zero Point Not
Completed
CIRCUIT DESCRIPTION
This DTC does not indicate trouble. This is detected when the torque sensor \
zero point calibration is not
completed normally.
DTC No.DTC Detecting ConditionTrouble Area
C1516/16The torque sensor zero point calibration is not completed
normally.Sensor zero point calibration failure.
INSPECTION PROCEDURE
1CLEAR DTC(See page 05±1045)
2PERFORM CALIBRATION OF TORQUE SENSOR ZERO POINT(See page 05±1045)
3 RECONFIRM DTC
(a)Check the DTCs (See page 05±1045).
(A): DTC C1516/16 output after attempted 3 time or more.
(B): Normal code output.
HINT:
If the DTC code is output in spite of conducting the steering zero point c\
alibration, replace the steering col-
umn assy.
(A) REPLACE STEERING COLUMN ASSY
(B)
END
0579K±02