Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ax cip1765
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DI-193
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI02Q-08
DTC P1765 Linear Solenoid for Accumulator Pressure Control
Circuit Malfunction (Shift Solenoid Valve SLN)
CIRCUIT DESCRIPTION
The shift solenoid valve SLN controls the hydraulic pressure
Accumulator Control Pressure acting on the accumulator control valve when gears are shifted
and performs smooth gear shifting.
High
The ECM determines optimum operating pressure according to
the signals from the throttle position sensor, vehicle speed sen-
sor and direct clutch speed sensor and controls the volume of
current flow to the solenoid valve.
The amount of current to the solenoid is controlled by the (*)
duty ratio of ECM output signals, causing a momentary change
to the hydraulic pressure acting on the clutches during gear
shifting.
When the duty ratio is high, the hydraulic pressure acting on the
0 clutches is low.
1
Electric Current (A)
AT5608
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then
D00060
DTC No. DTC Detecting Condition Trouble Area
After the engine is warmed up, the current flows to the shift
solenoid valve SLN for 1 sec or more under condition (a) or S Open or short in shift solenoid valve SLN circuit
P1765 (b): S Shift solenoid valve SLN
(a) Engine speed: 500 rpm or more S ECM
(b) Park/neutral position switch: ON (P or N position)
Reference
Waveform between terminals SLN+ Waveform between terminals SLN+
and SLN- when engine is idling. and SLN- during shift change.
5 V / Div. 5 V / Div.
GND GND
1 msec. / Div.
1 msec. / Div. D00062
2001 SIENNA (RM787U)
Author : Date : 347
DI-194
DIAGNOSTICS - AUTOMATIC TRANSAXLE
WIRING DIAGRAM
E1 ECM
Transaxle
20
3 B-Y
E12 SLN+
Shift Solenoid
Valve SLN
19
8 G-W
E12 SLN-
D07911
2001 SIENNA (RM787U)
Author : Date : 348
DI-195
DIAGNOSTICS - AUTOMATIC TRANSAXLE
INSPECTION PROCEDURE
1 Check shift solenoid valve SLN.
2
Check solenoid resistance and operation:
1
PREPARATION:
Disconnect the shift solenoid valve SLN connector.
CHECK:
(a) Measure resistance between terminals 1 and 2 of sole-
noid connector.
(b) Connect positive lead with an 8 - 10 W bulb to terminal
1 of solenoid connector and negative lead to terminal
2, then check the movement of the valve.
OK:
(a) Resistance: 5.1 - 5.5
2 1 (b)
When battery positive voltage is sup- Valve moves in direction shown in il-
plied. lustration. (on the left)
Valve moves in direction shown in il-
When battery positive voltage is cut off.
lustration. (on the right)
(-) (+)
D04720
Check solenoid operation:
PREPARATION:
Connect positive lead of the variable power supply to termi-
nal 1 of solenoid connector and negative lead to terminal 2.
CHECK:
(a) Check the movement of the valve when the voltage is
gradually increased.
(A current greater than 1A should not be supplied.)
(+)
(b) Check the movement of the valve when the voltage is cut
off.
OK:
1 2 (a) As the voltage is increased, the valve should move
slowly in the direction.
(b) The valve should return in the direction.
(-)
D00051
NG Replace the shift solenoid valve SLN.
OK
2001 SIENNA (RM787U)
Author : Date : 349
DI-196
DIAGNOSTICS - AUTOMATIC TRANSAXLE
2 Check harness and connector between battery and shift solenoid valve SLN,
shift solenoid valve SLN and ECM (See page IN-31 ).
NG Repair or replace the harness or connector.
OK
Check and replace the ECM
(See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 350
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