DTC    P0796    Pressure Control Solenoid "C" Performance (Shift Solenoid Valve SL3)

for Preparation Click here


DESCRIPTION

The TCM uses the vehicle speed signal and signals from the transmission speed sensors (NC, NT) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect mechanical problems of the shift solenoid valves and valve body.

DTC Code
DTC Detection Condition
Trouble Area
P0796
Either condition is met (2-trip detection logic):
  1. The engine revs freely when a shift to 2nd or 6th gear is commanded.
  2. The following condition is met twice:
    When a shift to 1st gear is commanded, 2nd gear is engaged.
  1. Shift solenoid valve SL3 remains open or closed
  2. Valve body is blocked
  3. Automatic transaxle (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on and off. According to the input shaft speed, intermediate (counter) shaft speed and output shaft speed, the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and stores the DTC.

INSPECTION PROCEDURE

1.CHECK DTC OUTPUT (IN ADDITION TO DTC P0796)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / ECT / DTC.

  1. Read the DTCs using the intelligent tester.

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

HINT:
If shift solenoid valve SL3 is stuck off, DTCs for several shift solenoid valves including the malfunctioning shift solenoid valve will be stored.


B
Go to step 3
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (RUNNING TEST)

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

  1. Warm up the engine.

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / ECT / Active Test.

  1. According to the display on the intelligent tester, perform the Active Test.

    HINT:
    Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem (Click here).

    ECT 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Control the Shift Position
    		Operate the shift solenoid valves and set each shift position
    1. Press "→" button: Shift up
    2. Press "←" button: Shift down
    		Can be used to check the operation of the shift solenoid valves.
    A 10-second interval is required between gear changes.
    Do not down-shift at high speeds. Doing so will damage the automatic transaxle.
    [Vehicle Condition]
    1. 50 km/h (30 mph) or less

    NOTICE:
    1. This test can be conducted when the vehicle is stopped.
    2. When shifting gears using the Active Test function, do not operate the accelerator pedal for 2 seconds before and after shifting gears.

    HINT:
    The gear commanded by the TCM is shown in the Data List / Shift Status display on the intelligent tester.

  1. Check the vehicle speed and gear when the engine speed is 1000 rpm.

    HINT:
    Because the torque converter clutch has not engaged, it may be difficult to obtain the speeds specified in 4th, 5th and 6th gear, however a difference of speed should still be evident following each gear change.

    Standard 
    1st
    		2nd
    		3rd
    		4th
    		5th
    		6th
    8 to 12 km/h (5 to 7.5 mph)
    		15 to 19 km/h (9.3 to 11.8 mph)
    		21 to 25 km/h (13.0 to 15.5 mph)
    		31 to 35 km/h (19.3 to 21.7 mph)
    		44 to 48 km/h (27.3 to 29.8 mph)
    		52 to 56 km/h (32.3 to 34.8 mph)

  1. Compare the TCM commanded gear and the actual gear.

    Result:

    System Condition
    		TCM Gear Shift Command
    		Proceed to
    1st
    		2nd
    		3rd
    		4th
    		5th
    		6th
    Malfunction
    		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.


B
GO TO DTC P0776 (Click here)

C
Go to step 5

D
GO TO DTC P2808 (Click here)

E
GO TO DTC P2714 (Click here)
A

GO TO DTC P0746 (Click here)  

3.INSPECT SHIFT SOLENOID VALVE SL3


    C197715E05

  1. Remove shift solenoid valve SL3.

  1. 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

  1. 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
    1. Battery positive (+) with a 21 W bulb → Terminal 1
    2. Battery negative (-) → Terminal 2
    		Valve moves and makes an operating noise
Text in Illustration 
*1
Component without harness connected
(Shift Solenoid Valve SL3)


NG
REPLACE SHIFT SOLENOID VALVE SL3 (Click here)
OK


4.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly (Click here).

    OK:
    There are no foreign objects on any valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY (Click here)
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY (Click here)  

5.INSPECT SHIFT SOLENOID VALVE SL3


    C197715E05

  1. Remove shift solenoid valve SL3.

  1. 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

  1. 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
    1. Battery positive (+) with a 21 W bulb → Terminal 1
    2. Battery negative (-) → Terminal 2
    		Valve moves and makes an operating noise
Text in Illustration 
*1
Component without harness connected
(Shift Solenoid Valve SL3)


NG
REPLACE SHIFT SOLENOID VALVE SL3 (Click here)
OK


6.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly (Click here).

    OK:
    There are no foreign objects on any valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY (Click here)
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY (Click here)