Toyota 4Runner: Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2) (P0776)

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2) (P0776)

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
P0776	Gear required by the ECM does not match the actual gear when driving (2-trip detection logic).	Shift solenoid valve SL2 remains open Shift solenoid valve SLT remains open or closed Valve body is blocked Automatic transmission (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

This DTC indicates a stuck ON malfunction of the shift solenoid valve SL2.

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	P0776: Shift solenoid valve SL2/Functional check
Required sensors/Components	Shift solenoid valve SL2, Speed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE)
Frequency of operation	Continuous
Duration	ON malfunction (A), (B) and (C): 0.4 sec. ON malfunction (D): 3 sec. ON malfunction (E): 0.5 sec.
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

ON Malfunction (A)

ECM selected gear	1st
Duration time for vehicle speed to reach 2 km/h (1.2 mph)	Less than 3 sec.
Duration time from shift command of ECM	2 sec. or more
Vehicle speed	2 km/h (1.2 mph) or more, and less than 40 km/h (24.9 mph)
Throttle valve opening angle	8% or more (When actual gear is 4th) 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)

ON Malfunction (B)

ECM selected gear	3rd
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)

ON Malfunction (C)

ECM selected gear	4th
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)

ON Malfunction (D)

Current ECM selected gear

5th

Last ECM selected gear

4th

Vehicle speed

(During transition from 4th to 5th gear)

Less than 100 km/h (62.2 mph)

ON Malfunction (E)

ECM selected gear

5th

Engine speed - Turbine speed (NE - NT)

(After transition from 4th to 5th gear)

150 rpm or less

Vehicle speed

(After transition from 4th to 5th gear)

Less than 100 km/h (62.2 mph)

TYPICAL MALFUNCTION THRESHOLDS

[ON malfunction]

Both of the following conditions are met:
ON malfunction (A) and (B), or ON malfunction (C)

ON malfunction (D) or (E)

ON Malfunction (A)

Turbine speed/Output speed (NT/NO)

3.30 or more, and 7.50 or less

(This means actual gear is 1st)

ON Malfunction (B)

Turbine speed/Output speed (NT/NO)

1.28 or more, and 1.53 or less

(This means actual gear is 3rd)

ON Malfunction (C)

Turbine speed/Output speed (NT/NO)

0.93 or more, and 1.07 or less

(This means actual gear is 4th)

ON Malfunction (D)

Turbine speed - Output speed x 4th gear ratio

(NT - NO x 4th gear ratio)

1000 rpm or more

ON Malfunction (E)

Turbine speed - Output speed x 5th gear ratio

(NT - NO x 5th gear ratio)

1000 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 valve SL2 turns ON/OFF normally when the shift lever is in D.

ECM gear shift command	1st	2nd	3rd	4th	5th
Shift solenoid valve SL2	ON	ON	ON	ON	OFF

PROCEDURE

1.	CHECK DTC OUTPUT (IN ADDITION TO DTC P0776)

(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 P0776 is output	A
P0776 and other DTCs are output	B

HINT:

If any other codes besides P0776 are output, perform troubleshooting for those DTCs first.

GO TO DTC CHART

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

REPLACE SHIFT SOLENOID VALVE SLT

3.	INSPECT SHIFT SOLENOID VALVE SL2

(a) Remove shift solenoid valve SL2.

(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 SL2)

REPLACE SHIFT SOLENOID VALVE SL2

4.	INSPECT TRANSMISSION VALVE BODY ASSEMBLY

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

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