TOYOTA AVENSIS 2005 Service Repair Manual

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
V
7L19
E12SBECM
SB 05±1030
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P1798 SB SOLENOID CIRCUIT MALFUNCTION
(SHIFT SOLENOID VALVE SB)
CIRCUIT DESCRIPTION
Shift solenoid valve SB controls the 2nd brake (B1) and 1st and reverse brake pressures and performs the
1st and 2nd engine brake control.
Fail safe function:

S shift control prohibition.

On activating the fail±safe function during S shift, the driving mode turns to the ordinal D range.
DTC No.DTC Detection ConditionTrouble Area
P1798
ECM memorizes DTC P1798 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 SB circuit

Shift solenoid valve SB

ECM
WIRING DIAGRAM
05C8N±01

C54864SB
C95812
E1
SB
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)05±1031
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT TRANSMISSION WIRE(SB)
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure resistance between terminal 7 and body
ground.
OK:
Resistance: 11 to 15
at 20
C (68
F)
NG Go to step 3
OK
2 CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE ± ECM)
(a) Connect the transmission wire connector to the transaxle.
(b) Disconnect the ECM connector.
(c) Measure resistance between terminals SB and E1.
OK:
Resistance: 11 to 15
at 20
C (68
F)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ECM

D09034
05±1032± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)
AVENSIS REPAIR MANUAL (RM1018E)
3 INSPECT SHIFT SOLENOID VALVE(SB)
(a) Remove the shift solenoid valve SB.
(b) Measure resistance between the solenoid connector and
the solenoid body.
OK:
Resistance: 11 to 15
at 20
C (68
F)
(c) Connect the positive (+) lead to the terminal of solenoid
valve connector and the negative (±) lead to the solenoid
valve body.
OK:
The solenoid valve makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(SB)
OK
REPAIR OR REPLACE TRANSMISSION WIRE

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

C54864
ST
C95812
E1ST
05±1028± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT TRANSMISSION WIRE(ST)
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure the resistance between terminal ST and body
ground.
OK:
Resistance: 11 to 15
at 20
C (68
F)
NG Go to step 3
OK
2 CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE ± ECM)
(a) Connect the transmission wire connector to the transaxle.
(b) Disconnect the ECM connector.
(c) Measure the resistance between terminals ST and E1.
OK:
Resistance: 11 to 15
at 20
C (68
F)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ECM

D09034
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)05±1029
AVENSIS REPAIR MANUAL (RM1018E)
3 INSPECT SHIFT SOLENOID VALVE(ST)
(a) Remove the shift solenoid valve ST.
(b) Measure the resistance between the solenoid connector
and the solenoid valve body.
OK:
Resistance: 11 to 15
at 20
C (68
F)
(c) Connect the positive (+) lead to the terminal of solenoid
connector and the negative (±) lead to the solenoid valve
body.
OK:
The solenoid valve makes an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(ST)
OK
REPAIR OR REPLACE TRANSMISSION WIRE

05±1024± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U341E)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P1780 PARK/NEUTRAL POSITION SWITCH
MALFUNCTION
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends the signals to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
DTC is detected for 500 msec. or more (2±trip detection logic).

2 or more switches are ON simultaneously for P, R, N and D
position.
Sh t i k/ t l iti it h i it
P1780When any of following conditions for 500 msec. or more in the
S position (2±trip detection logic).
(a) P position input signal is ON.
(b) N position input signal is ON.
(c) R position input signal is ON.
Short in park/neutral position switch circuit

Park/neutral position switch assy

ECM
0568L±06