Toyota 4Runner: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) (P0746,P0771)

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) (P0746,P0771)

DESCRIPTION

The ECM uses signals from the output shaft speed sensor and input 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, valve body or automatic transmission (clutch, brake, gear, etc.).

DTC Code	DTC Detection Condition	Trouble Area
P0746	The gear required by the ECM does not match the actual gear when driving (2-trip detection logic).	Shift solenoid valve SL1 remains closed Shift solenoid valve SR remains open or closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.)
P0771	The gear required by the ECM does not match the actual gear when driving (2-trip detection logic).	Shift solenoid valve SR remains open or closed Shift solenoid valve SL1 remains closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

These DTCs indicate a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valves SR and SL1.

The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. 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

Related DTCs	P0746: Shift solenoid valve SL1/Functional check P0771: Shift solenoid valve SR/Functional check
Required sensors/Components (Main)	Shift solenoid valve SL1 Shift solenoid valve SR
Required sensors/Components (Related)	Speed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE)
Frequency of operation	Continuous
Duration	P0746 and P0771 OFF malfunction (A): 0.4 sec. P0746 and P0771 OFF malfunction (B) and (C): Immediately P0771 ON malfunction: 2 cycles
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored	P0717 (Turbine speed sensor circuit) P0722 (Output speed sensor circuit) P0973, P0974 (Shift solenoid valve S1 circuit) P0976, P0977 (Shift solenoid valve S2 circuit) P0985, P0986 (Shift solenoid valve SR circuit) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0128 (ECT (Engine Coolant Temperature) sensor circuit) P0327, P0328, P0332, P0333 (KCS sensor circuit)
ETCS (Electric Throttle Control System)	Not system down
Transmission position	"D"
Duration time from shifting "N" to "D"	4 sec. or more
ECT	40°C (104°F) or higher
Spark advance from max. retard timing by KCS control	0° crankshaft angle or more
Engine	Starting

P0746 and P0771: OFF Malfunction (A)

ECM selected gear	5th
Duration time from shift command of ECM	2 sec. or more
Vehicle speed	2 km/h (1.2 mph) or more
Throttle valve opening angle	6.5% or more at 2000 rpm (Conditions vary with engine speed)
Calculated load value	7.75% or more
Following conditions is met: (a), (b), (c), (d) or (e)	-
(a) Turbine speed/Output speed (NT/NO)	3.30 or more, and 7.50 or less (This means actual gear is 1st)
(b) Turbine speed/Output speed (NT/NO)	1.91 or more, and 2.35 or less (This means actual gear is 2nd)
(c) Turbine speed/Output speed (NT/NO)	1.28 or more, and 1.53 or less (This means actual gear is 3rd)
(d) Turbine speed/Output speed (NT/NO)	0.93 or more, and 1.07 or less (This means actual gear is 4th)
(e) Turbine speed/Output speed (NT/NO)	0.65 or more, and 0.79 or less (This means actual gear is 5th)

P0746 and P0771: OFF Malfunction (B)

Current ECM selected gear	5th
Last ECM selected gear	4th
Duration time from 4th to 5th shift command of ECM	0.3 sec. or more, and less than 3 sec.
Continuous time for ECM selecting 4th gear	2 sec. or more
Actual gear when ECM selected 4th gear	4th

P0746 and P0771: OFF Malfunction (C)

Current ECM selected gear	5th
Last ECM selected gear	4th
Duration time from 4th to 5th shift command of ECM	3 sec. or more

P0771: ON Malfunction

Current ECM selected gear

2nd

Last ECM selected gear

1st

Throttle valve opening angle

(During transition from 1st to 2nd gear)

6.5% or more at 2000 rpm

(Conditions vary with engine speed)

TYPICAL MALFUNCTION THRESHOLDS

[P0746 and P0771: OFF malfunction]

All of the following conditions are met: OFF malfunction (A), (B) and (C)
2 detections are necessary per driving cycle
1st detection: temporary flag ON
2nd detection: pending fault code ON

OFF Malfunction (A)

Turbine speed/Output speed (NT/NO)

0.93 or more, and 1.07 or less

(This means actual gear is 4th)

OFF Malfunction (B)

Turbine speed/Output speed (NT/NO)

Does not change as follows

0.93 or more, and 1.07 or less

(This means actual gear is 4th)

↓

0.65 or more, and 0.79 or less

(This means actual gear is 5th)

OFF Malfunction (C)

Output record of ECM from 4th to 5th up-shift

Recorded

[P0771: ON malfunction]

2 detections are necessary per driving cycle
1st detection: temporary flag ON
2nd detection: pending fault code ON

ON Malfunction

Turbine speed - Output speed x 1st gear ratio

(NT - NO x 1st gear ratio)

150 rpm or more

CAUTION / NOTICE / HINT

NOTICE:

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

1. ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests 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 Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Active Test.

(g) According to the display on the Techstream, perform the Active Test.

HINT:

While driving, the shift position can be forcibly changed with the Techstream.

Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (See page ).

Engine and ECT

Tester Display	Test Part	Control Range	Diagnostic Note
Control the Shift Position	Operate shift solenoid valve and set each shift position	Press "→" button: Shift up Press "←" button: Shift down	Possible to check operation of the shift solenoid valves. [Vehicle Condition] 50 km/h (31 mph) or less.

Tester Display

Test Part

Control Range

Diagnostic Note

Control the Shift Position

Operate shift solenoid valve and set each shift position

Press "→" button: Shift up
Press "←" button: Shift down

Possible to check operation of the shift solenoid valves.

[Vehicle Condition]

50 km/h (31 mph) or less.

HINT:

This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
The 4th to 5th up-shift must be performed with the accelerator pedal released.
The 5th to 4th down-shift must be performed with the accelerator pedal released.
Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
The shift position commanded by the ECM is shown in the Data List display on the Techstream.

The shift solenoid valves SL1 and SR turn ON/OFF normally when the shift lever is in D.

ECM gear shift command	1st	2nd	3rd	4th	5th
Shift solenoid valve SL1	OFF	OFF	OFF	OFF	ON
Shift solenoid valve SR	OFF	OFF	OFF	OFF	ON

PROCEDURE

1.	CHECK DTC OUTPUT (IN ADDITION TO DTCS P0746 AND P0771)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs using the Techstream.

Result

Result	Proceed to
Only P0746 and P0771 are output Only P0771 is output	A
P0746, P0771 and other DTCs are output	B

HINT:

If any other codes besides P0746 and P0771 are output, perform troubleshooting for those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT)

NOTICE:

Perform the test while the ATF temperature is 50 to 80°C (122 to 176°F).
Be careful to prevent SST's hose from interfering with the exhaust pipe.
Perform the test with the A/C off.

HINT:

(a) Remove the test plug from the transmission case and connect SST.

SST: 09992-00095

09992-00231

09992-00271

(b) Connect the Techstream to the DLC3.

(d) Measure the line pressure with SST.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Active Test.

(g) According to the display on the Techstream, perform the Active Test.

(h) Measure the line pressure.

Engine and ECT

Tester Display	Test Part	Control Range	Diagnostic Note
Activate the Solenoid (SLT)*	Operate shift solenoid SLT and raise line pressure	ON or OFF HINT: OFF: Line pressure up (when Active Test "Activate the Solenoid (SLT)" is performed, ECM commands SLT solenoid to turn OFF) ON: No action (normal operation)	[Vehicle Condition] Vehicle stopped. Engine idling.

HINT:

*: Activate the Solenoid (SLT) in the Active Test is performed to check the line pressure changes by connecting SST to the automatic transmission, which is used in the Hydraulic Test (See page ) as well. Note
that the pressure values in the Active Test and Hydraulic Test are different.

OK:

The line pressure changes as specified when performing the Active Test.

REPLACE SHIFT SOLENOID VALVE SLT

3.	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

OK:

Measurement Condition	Specified Condition
Battery positive (+) with a 21 W bulb → Terminal 1 Battery negative (-) → Terminal 2	Valve moves and makes operating noise

Text in Illustration

*a	Component without harness connected (Shift Solenoid Valve SL1)

REPLACE SHIFT SOLENOID VALVE SL1

4.	INSPECT SHIFT SOLENOID VALVE SR

(a) Remove shift solenoid valve SR.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Shift solenoid valve SR connector terminal - Shift solenoid valve SR body	20°C (68°F)	11 to 15 Ω

OK:

Measurement Condition	Specified Condition
Battery positive (+) → Shift solenoid valve SR connector Battery negative (-) → Shift solenoid valve SR body	Valve moves and makes operating noise

Text in Illustration

*a	Component without harness connected (Shift Solenoid Valve SR)

REPLACE SHIFT SOLENOID VALVE SR

5.	INSPECT TRANSMISSION VALVE BODY ASSEMBLY

(a) Check the transmission valve body assembly (See page ).

OK:

There are no foreign objects on any valve.

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

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