Dtc P0796 Pressure Control Solenoid C Performance (Shift Solenoid Valve Sl3)

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0796)

PERFORM ACTIVE TEST USING GTS (CONTROL THE SHIFT POSITION)

INSPECT SHIFT SOLENOID VALVE SL3

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

NOTICE:

Perform registration and/or initialization when parts related to the automatic transmission are replaced (LandCruiser RM000000O7H0HLX.html).

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

1. Perform the D Position Shift Test in Road Test (LandCruiser RM000000W790S9X.html).*1
   
2. Turn the ignition switch off.
   
3. Perform step (*1) again.
   
4. Check for DTCs again (LandCruiser RM000000W7711DX.html).
   

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   

5. Read the DTCs using the GTS.
   
   

   Result

   Result	Proceed to
   Only DTC P0796 is output	A
   P0796 and other DTCs are output	B

HINT:

If a solenoid is stuck off, DTCs for several solenoids including the malfunctioning solenoid will be detected.

NOTICE:

This test should always be performed with at least 2 people.

1. Warm up the engine.
   

2. Turn the ignition switch off.
   

3. Connect the GTS to the DLC3.
   

4. Turn the ignition switch to ON.
   

5. Turn the GTS on.
   

6. Enter the following menus: Powertrain / Engine and ECT / Active Test.
   

7. According to the display on the GTS, perform the Active Test.
   

   HINT:

   Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem (LandCruiser RM000000O8L0SQX.html).

   
   

   Engine and ECT

   Tester Display	Test Part	Control Range	Diagnostic Note
   Control the Shift Position	Operates the shift solenoid valves to allow gears to be selected manually.	Press "→" button: Up-shift occurs Press "←" button: Down-shift occurs	Can be used to check the operation of the shift solenoid valves. Up-shifts and down-shifts should be performed consecutively. A 10 second interval is required between gear changes. Do not down-shift at high speeds. Doing so will damage the automatic transmission. [Vehicle Condition] 50 km/h (31 mph) or less

   HINT:

   1. This test can be conducted when the vehicle speed is 50 km/h (30 mph) or less.
      
   2. The 4th to 5th and 5th to 6th up-shift must be performed with the accelerator pedal released.
      
   3. The 6th to 5th and 5th to 4th down-shift must be performed with the accelerator pedal released.
      
   4. Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
      
   5. The gear commanded by the ECM is shown in the Data List / Shift Status display on the GTS.
      

8. Compare the ECM commanded gear and the actual gear.
   
   

   Result:

   
   

   Actual Gear during Malfunction		ECM Commanded Gear						Proceed to
   		1st	2nd	3rd	4th	5th	6th
   Shift solenoid valve SL1	Stuck ON	1st	2nd	3rd	4th	4th	4th	A
   	Stuck OFF	N*1	N*1	N*1	N*1	5th	6th
   Shift solenoid valve SL2	Stuck ON	4th	4th	4th	4th	5th	6th	B
   	Stuck OFF	1st	2nd	3rd	1st	N*1	N*1
   Shift solenoid valve SL3	Stuck ON	2nd	2nd	3rd	4th	5th	6th	C
   	Stuck OFF	1st	1st	3rd	4th	5th	N*1
   Shift solenoid valve SL4	Stuck ON	3rd	3rd	3rd	4th	5th	5th	D
   	Stuck OFF	1st	2nd	1st	4th	N*1	6th
   Shift solenoid valve SLT	Stuck ON	N*2	N*2	N*2	N*2	N*2	N*2	E
   	Stuck OFF*3	1st	2nd	3rd	4th	5th	6th

   HINT:

   1. *1: Neutral
      
   2. *2: If shift solenoid valve SLT is stuck on, the line pressure will be low. Therefore, the amount of torque that can be transmitted by each gear is lower than the normal limit. When the engine power exceeds this lowered limit, the engine speed will increase freely.
      
   3. *3: When shift solenoid valve SLT is stuck off, gear shifting is normal.
      

1. Remove shift solenoid valve SL3 (LandCruiser RM000000O9L07IX.html).
   

2. 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

3. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.
   

   OK:

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

1. Check the transmission valve body assembly (LandCruiser RM000000O9L07IX.html).
   

   OK:

   There is no foreign matter on each valve and they operate smoothly.