2005 TOYOTA AVENSIS clutch

± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)05±997
AVENSIS REPAIR MANUAL (RM1018E)
HINT:
This DTC may be output when the clutch, brake and gear components, etc. inside the automatic transmis-
sion are damaged.

D26541
C3
Counter Gear Speed
SensorECM
26
E12 NC+ LG
2
34
E12 NC± LG±B 1
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))05±965
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0793 INTERMEDIATE SHAFT SPEED SENSOR
ºAº
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC)
with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriate-
ly controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shift-
ing is performed.
DTC No.DTC Detection ConditionTrouble Area
P0793
ECM detects conditions (a), (b), (c) and (d) continuity for 5 sec.
or more: (1 trip detection logic)
(a) Vehicle speed: 50 km/h (20 mph) or more
(b) 2nd, 3rd or O/D gear
(c) Solenoid valves and park/neutral position switch are normal
(d) NC < 300 rpm

Open or short in speed sensor (NC) circuit

Speed sensor (NC)

ECM
WIRING DIAGRAM
05C9H±01

D25466
12
12
(+)
(±)
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))05±963
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0776 PRESSURE CONTROL SOLENOID ºBº
PERFORMANCE (SHIFT SOLENOID VALVE
SL2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
troubles of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0776The gear required by the ECM does not match the actual gear
when driving (2±trip detection logic)
Shift solenoid valve SL2 is stuck open or closed

Valve body is blocked up or stuck

Automatic transaxle (clutch, brake or gear etc.)
INSPECTION PROCEDURE
1 INSPECT SHIFT SOLENOID VALVE(SL2)
(a) Remove the shift solenoid valve SL2.
(b) Measure the resistance between terminals.
OK:
Resistance: 5.1 to 5.5
at 20C (68F)
(c) Connect the positive (+) lead with a 21 W bulb to terminal
2 and the negative (±) lead to terminal 1 of the solenoid
valve connector, then check the movement of the sole-
noid valve.
OK:
The solenoid valve makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(SL2)
OK
2 INSPECT TRANSMISSION VALVE BODY ASSY
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY
OK
05C9G±01

05±964± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))
AVENSIS REPAIR MANUAL (RM1018E)
3 INSPECT TORQUE CONVERTER CLUTCH ASSY
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY

D25467
(+)(±)
05±962± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0766 SHIFT SOLENOID ºDº PERFORMANCE
(SHIFT SOLENOID VALVE S4)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
troubles of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0766The gear required by the ECM does not match the actual gear
when driving (2±trip detection logic)
Shift solenoid valve S4 is stuck open or closed

Valve body is blocked up or stuck

Automatic transaxle (clutch, brake or gear etc.)
INSPECTION PROCEDURE
1 INSPECT SHIFT SOLENOID VALVE(S4)
(a) Remove the shift solenoid valve S4.
(b) Measure the resistance between the solenoid connector
and the solenoid body.
OK:
Resistance: 11 to 15
at 20C (68F)
(c) Connect the positive (+) lead to the terminal of solenoid
connector and the negative (±) lead to the solenoid body.
OK:
The solenoid makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(S4)
OK
2 INSPECT TRANSMISSION VALVE BODY ASSY
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY
OK
3 INSPECT TORQUE CONVERTER CLUTCH ASSY
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY
05C9F±01

D26539
E1
ECT Solenoid
Y
2R±B12
E12
STECM
ST
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)05±1027
AVENSIS REPAIR MANUAL (RM1018E)
DTC P1790 ST SOLENOID CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
Shift solenoid valve ST is switched ON±OFF by a signal from ECM so that let in or out timing of O/D and
2nd brake is adjusted by operating orifice control valve. Therefore, shift solenoid valve ST operates when
letting in or out reverse clutch.
If it is broken, the shift shock becomes big.
DTC No.DTC Detection ConditionTrouble Area
P1790
ECM memorizes DTC P1790 if (a) or (b) condition below is
detected once or more.
(a) Solenoid resistance is 30
or lower (short circuit) when
solenoid is energized.
(b) Solenoid resistance is 100 k
or higher (open circuit) when
solenoid is not energized.

Open or short in shift solenoid valve ST circuit

Shift solenoid valve ST

ECM
WIRING DIAGRAM
05C8M±01

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