Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 2011n cip0746
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05-590 DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] 05BUM-02
DTC P0746 PRESSURE CONTROL SOLENOID "A"
PERFORMANCE (SHIFT SOLENOID VALVE
SL1)
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
problems of the shift solenoid valves and valve body.
DTC No. DTC Detecting Condition Trouble Area
S Shift solenoid valve SL1 remains open or closed
S Valve body is blocked
The gear required by the ECM does not match the actual gear
P0746 S Shift solenoid valve SL1
when driving (2-trip detection logic)
S Automatic transaxle (clutch, brake or gear etc.)
S ECM
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 same, the ECM illuminates the MIL.
Example:
When either condition (a) or (b) is met, the ECM detects a malfunction.
(a) The ECM commands the 1st gear, but the actual gear is 2nd.
(b) The ECM commands the 2nd gear, but the actual gear is 1st.
MONITOR STRATEGY
P0746:
Related DTCs Shift solenoid valve SL1/OFF malfunction
Shift solenoid valve SL1/ON malfunction
Shift solenoid valve SL1, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
Required sensors/Components
tion sensor (NE)
Frequency of operation Continuous
Duration 0.8 sec.
MIL operation 2 driving cycles
Sequence of operation None
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 773
DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-591
TRANSAXLE [ECT]
TYPICAL ENABLING CONDITIONS
ALL:
Transmission range "D"
ECT (Engine coolant temperature) 10_C (50_F) or more
TFT (Transmission fluid temperature) -20 _C (-4_F) or more
TFT sensor circuit Not circuit malfunction
ECT sensor circuit Not 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
Shift solenoid valve SL3 circuit Not circuit malfunction
Shift solenoid valve S4 circuit Not circuit malfunction
Shift solenoid valve SR circuit Not circuit malfunction
Shift solenoid valve DSL circuit Not circuit malfunction
OFF malfunction
ECM selected gear 1st
Vehicle speed Less than 40 km/h (24.9 mph)
4.5% or more at engine speed 1,900 rpm
Throttle valve opening angle
(Varies with engine speed)
ON malfunction
ECM selected gear 2nd
4.5% or more at engine speed 1,900 rpm
Throttle valve opening angle
(Varies with engine speed)
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction or ON malfunction
OFF malfunction
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON
Input (turbine) speed/Intermediate shaft speed 1.49 to 1.63
ON malfunction
Input (turbine) speed/Intermediate shaft speed 2.72 to 2.86
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 774
05-592 DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Turn the ignition switch off.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Push the "ON" button of the hand-held tester.
(e) Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/SHIFT".
(f) According to the display on tester, perform the "ACTIVE TEST".
HINT:
While driving, the shift position can be forcibly changed with the hand-held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem.
Item Test Details Diagnostic Note
[Test Details]
Operate the shift solenoid valve and set the each shift position by your-
self.
[Vehicle Condition] Possible to check the operation of
SHIFT
Less than 50 km/h (31 mph) the shift solenoid valves.
[Others]
S Press "" button: Shift up
S Press "" button: Shift down
HINT:
S This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
S The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the hand-held
tester.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 775
DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-593
TRANSAXLE [ECT]
1 INSPECT SHIFT SOLENOID VALVE(SL1)
(a) Remove the shift solenoid valve SL1.
1 2 (b) Measure the resistance between terminals.
OK:
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