Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ax cip0753p
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DI-181
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI0CT-06
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No.1 and
No.2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM con-
trols the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail Safe Function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunctioning, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
NORMAL SHIFT SOLENOID NO.1 SHIFT SOLENOID NO.2 BOTH SOLENOID
MALFUNCTIONING MALFUNCTIONING MALFUNCTIONING
Position
Solenoid valve Solenoid valve Solenoid valve Gear when shift selector is
Gear Gear Gear manually operated
No.1 No.2 No.1 No.2 No.1 No.2
ON OFF 1st X ON 3rd ON X 1st O/D
ON ON 2nd X ON 3rd OFF X O/D O/D
D
OFF ON 3rd X ON 3rd OFF X O/D O/D
OFF OFF O/D X OFF O/D OFF X O/D O/D
ON OFF 1st X ON 3rd ON X 1st O/D
2 ON ON 2nd X ON 3rd OFF X O/D O/D
OFF ON 3rd X ON 3rd OFF X O/D O/D
ON OFF 1st X OFF 1st ON X 1st 1st
L
ON ON 2nd X ON 2nd ON X 1st 1st
X: Malfunctions
HINT:
Check the shift solenoid valve No.1 when DTC P0753 is output and check the shift solenoid valve No.2 when
DTC P0758 is output.
DTC No. DTC Detecting Condition Trouble Area
The ECM checks for an open or short circuit in the shift sole-
noid valve No.1 and/or No.2 circuit when it changes.
The ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL.
S Open or short in shift solenoid valve No.1/No.2 circuit
P0753 After ECM detects condition (a) or (b) continuously 8 times or
S Shift solenoid valve No.1/No.2
P0758 more in a trip and the MIL lights up.
S ECM
(a) When the solenoid is energized, the solenoid resistance is
8 or less and is counted.
(b) When the solenoid is not energized, the solenoid resistance
is 100 k or more and is counted.
2001 SIENNA (RM787U)
Author : Date : 335
DI-182
DIAGNOSTICS - AUTOMATIC TRANSAXLE
WIRING DIAGRAM
Transaxle ECM
Shift Solenoid
Valve No.1
5 W-G 7
E12 S1
Shift Solenoid J13
Valve No.2 Junction Connector
10 1
L-B D D L-B
E10 S2
D
Cruise Control ECU
F03441
INSPECTION PROCEDURE
1 Measure resistance between terminal S1 or S2 of ECM and body ground.
PREPARATION:
Disconnect the connector from ECM.
CHECK:
S1
Measure resistance between terminal S1 or S2 of ECM and
S2 body ground.
OK:
Resistance: 11 - 15
D10347 OK Check and replace the ECM (See page IN-31 ).
NG
2001 SIENNA (RM787U)
Author : Date : 336
DI-183
DIAGNOSTICS - AUTOMATIC TRANSAXLE
2 Measure resistance of harness and connector between ECM and automatic
transaxle solenoid connector.
PREPARATION:
Disconnect the solenoid connector from the automatic trans-
axle.
S1 S2
CHECK:
S1 Measure resistance of the harness and connector between ter-
S2
minal S1 or S2 of ECM and terminal S1 or S2 of solenoid con-
nector.
OK:
Resistance: 0
D10348
Q00224 D07895
NG Repair or replace the harness or connector.
OK
2001 SIENNA (RM787U)
Author : Date : 337
DI-184
DIAGNOSTICS - AUTOMATIC TRANSAXLE
3 Check shift solenoid valve No.1 or No.2.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the oil pan.
(c) Disconnect the solenoid connector.
(d) Remove the shift solenoid valve No.1 or No.2.
CHECK:
(a) Measure resistance between solenoid connector and
body ground.
(+)
(b) Connect the positive lead to terminal of solenoid con-
(-) nector, negative lead to solenoid body.
OK:
(a) Resistance: 11 - 15 at 20 ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo