2007 TOYOTA SIENNA Service Repair Manual

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Page 1465 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–99
AX
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Usin

Page 1466 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AX–100U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(g) According to the display on the tester, read the "DATA LIST".
HINT:
• SPD (NC) is always 0 while driving:
Open or s

Page 1467 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–101
AX
(a) Connect the speed sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in

Page 1468 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AX–102U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5

AX–102U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th 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.
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input
shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the
actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the
ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
DTC P0796Pressure Control Solenoid "C" Performance
(Shift Solenoid Valve SL3)
DTC No. DTC Detection Condition Trouble Area
P0796The gear required by the ECM does not match the
actual gear when driving (2-trip detection logic)• Shift solenoid valve SL3 remains open or closed
• Valve body is blocked
• Automatic transaxle (clutch, brake or gear etc.)
Related DTCsP0796:
Shift solenoid valve SL3/OFF malfunction
Shift solenoid valve SL3/ON malfunction
Required sensors/ComponentsShift solenoid valve SL3, Speed sensor (NT), Speed sensor (NC), Crankshaft
position sensor (NE)
Frequency of operation Continuous
DurationOFF malfunction (A)
0.8 sec.
OFF malfunction (B)
1 sec.
ON malfunction (A) and (B)
0.8 sec.
ON malfunction (C)
0.4 sec.
MIL operation 2 driving cycles
Sequence of operation None
The monitor will run whenever this DTC is not present.P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for closed loop)
P0500 (VSS)
P0748, P0778, P0798 (Shift solenoid valve (range))
ECT (Engine coolant temperature) 10
C (50F) or more
Transmission range"D"
TFT (Transmission fluid temperature) -20
C (-4F) or more
TFT sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
Turbine speed sensor circuit Not circuit malfunction
Intermediate shaft speed sensor circuit Not circuit malfunction
Output speed sensor circuit Not circuit malfunction
Shift solenoid valve SL1 circuit Not circuit malfunction
Shift solenoid valve SL2 circuit Not circuit malfunction

Page 1469 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–103
AX
OFF malfunction (A):
OFF malfunction (B):
ON malfunction (A):
ON malfunction (B):
ON malfunction (C):
TYPICAL MALFUNCTION THRESHOL

Page 1470 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AX–104U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
INSPECTION PROCEDURE
HINT:
Using the intelligent tester to perform ACTIVE TEST allows relays, VSVs, actuators and other items to b

AX–104U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
INSPECTION PROCEDURE
HINT:
Using the intelligent tester to perform ACTIVE TEST allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing ACTIVE TEST
early in troubleshooting is one way to save diagnostic time. DATA LIST information can be displayed while
performing ACTIVE TEST.
1. PERFORM ACTIVE TEST
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the intelligent tester together with the CAN VIM (controller area network vehicle
interface module) to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Turn on the tester.
(f) Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / SHIFT".
(g) According to the display on the tester, perform the "ACTIVE TEST".
HINT:
While driving, the shift position can be forcibly changed with the intelligent tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page AX-30).
HINT:
• This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
• The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the intelligent
tester.
(a) Connect the intelligent tester together with the CAN VIM
(controller area network vehicle interface module) to the
DLC3.
(b) Turn the ignition switch to the ON position and turn the
OBD II scan tool or the intelligent tester main switch ON.
(c) When you use intelligent tester:
Select the item "DIAGNOSIS / ENHANCED OBD II /
DTC INFO / CURRENT CODES".
(d) Read the DTCs using the OBD II scan tool or the
intelligent tester.
Result
Tester Display Test Part Control Range Diagnostic Note
SHIFT[Test Details]
Operate the shift solenoid valve and set the each
shift position by yourself.
[Vehicle Condition]
• IDL: ON
• Less than 50 km/h (31 mph)
[Others]
•Press "
" button: Shift up
•Press "" button: Shift down1st/2nd/3rd/4th/5thPossible to check the
operation of the shift
solenoid valves.
1CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0796)
Result Proceed to
P0796 A
P0796 and other DTCs B

Page 1471 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–105
AX
HINT:
If any other codes besides "P0796" are output, perform
the troubleshooting for those DTCs first.
B
A
(a) Remove the

Page 1472 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AX–106U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

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