Toyota Venza: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) (P0748)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) (P0748)

DESCRIPTION

Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated (See page ).

DTC No.	DTC Detection Condition	Trouble Area
P0748	The TCM checks for an open or short in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gears. (1-trip detection logic) Output signal duty equals 100%. (NOTE: SL1 output signal duty is less than 100% under normal condition.)	Open or short in shift solenoid valve SL1 circuit Shift solenoid valve SL1 TCM

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. The TCM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the TCM stops sending current to the circuit.)

While driving and shifting between 4th and 5th gears, if the TCM detects an open or short in the shift solenoid valve SL1 circuit, the TCM determines there is a malfunction (See page ).

MONITOR STRATEGY

Related DTCs	P0748: Shift solenoid valve SL1/Range check
Required sensors/Components	Shift solenoid valve SL1
Frequency of operation	Continuous
Duration	1 sec.
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not present	None
Ignition switch	ON
Starter	OFF

Condition (A)

Battery voltage

12 V or more

Condition (B)

Battery voltage	10 V or more and less than 12 V
Target current	Less than 0.75 A

Condition (C)

Battery voltage	8 V or more
Target current	0.25 A or more

TYPICAL MALFUNCTION THRESHOLDS

Condition (A) and (B)

Output duty cycle

100% or more

Condition (C)

Output duty cycle

0% or less

COMPONENT OPERATING RANGE

Output duty cycle

More than 3% and less than 100%

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

HINT:

The following table shows normal operation of the shift solenoid valve SL1 when the shift lever is in D:

TCM commanded gear	1st	2nd	3rd	4th	5th	6th
Shift solenoid valve SL1	ON	ON	ON	ON	OFF	OFF

PROCEDURE

1.	INSPECT TRANSMISSION WIRE (SL1)

(a) Remove the TCM from the transaxle.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
14 (SL1+) - 13 (SL1-)	20°C (68°F)	5.0 to 5.6 Ω
14 (SL1+) - Body ground	Always	10 kΩ or higher
13 (SL1-) - Body ground	Always	10 kΩ or higher
14 (SL1+) - All other terminals except 13 (SL1-)	Always	10 kΩ or higher
13 (SL1-) - All other terminals except 14 (SL1+)	Always	10 kΩ or higher

REPLACE TCM

2.	INSPECT SHIFT SOLENOID VALVE SL1

(a) Remove shift solenoid valve SL1.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	5.0 to 5.6 Ω

Text in Illustration

*1	Shift Solenoid Valve SL1

(c) Connect a battery positive (+) lead with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

REPLACE TRANSMISSION WIRE

REPLACE SHIFT SOLENOID VALVE SL1

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