AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0796

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

SYSTEM 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 No. DTC Detection Condition Trouble Area
P0796

The engine revs freely when 2nd or 6th gear is commanded (2-trip detection logic).

When the following is detected twice (2-trip detection logic):


  • When 1st gear is commanded, 2nd gear is engaged.

  • Shift solenoid valve SL3 remains open or closed.

  • Valve body is blocked.

  • Automatic transaxle (clutch, brake or gear etc.)

MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on and off. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (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.

MONITOR STRATEGY

Related DTCs

P0796:

Shift solenoid valve SL3/OFF malfunction

Shift solenoid valve SL3/ON malfunction
Required sensors/Components Shift solenoid valve SL3, Speed sensor (NT), Speed sensor (NC), Crankshaft position sensor (NE)
Frequency of operation Continuous
Duration

OFF malfunction (A) and (B)

0.5 sec.

OFF malfunction (C) and (D)

0.8 sec.

ON malfunction

0.8 sec.
MIL operation 2 driving cycles
Sequence of operation None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever this DTC is not present.

(Not circuit malfunction)

P0712, P0713 (ATF temperature sensor circuit (TFT sensor))

P0115, P0117, P0118 (ECT sensor circuit)

P0715, P0717 (Turbine speed sensor circuit)

P0791, P0793 (Intermediate shaft speed sensor circuit)

P0748 (Shift solenoid valve SL1 circuit)

P0778 (Shift solenoid valve SL2 circuit)

P0798 (Shift solenoid valve SL3 circuit)

P2810 (Shift solenoid valve SL4 circuit)

P0327, P0328, P0332, P0333 (KCS sensor circuit)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system)

U0100 (CAN communication system)
Transmission range "D"
TFT (Transmission fluid temperature) -10°C (14°F) or more
TFT (Transmission fluid temperature) sensor circuit No circuit malfunction
ECT (Engine coolant temperature) sensor circuit No circuit malfunction
Turbine speed sensor circuit No circuit malfunction
Intermediate shaft speed sensor circuit No circuit malfunction
Shift solenoid valve SL1 circuit No circuit malfunction
Shift solenoid valve SL2 circuit No circuit malfunction
Shift solenoid valve SL3 circuit No circuit malfunction
Shift solenoid valve SL4 circuit No circuit malfunction
(KCS) Knock control sensor circuit No circuit malfunction
(ETCS) Electronic throttle control system Not system down
CAN communication system Not system down
Engine Starting
OFF malfunction (A):
TCM selected gear 2nd
Throttle valve opening angle 3% or more
TCM indicated pressure value of SL1 1,200 kPa
TCM indicated pressure value of SL2 0 kPa
TCM indicated pressure value of SL3 1,200 kPa
OFF malfunction (B):
TCM selected gear 6th
Throttle valve opening angle 3% or more
TCM indicated pressure value of SL1 0 kPa
TCM indicated pressure value of SL2 1,200 kPa
TCM indicated pressure value of SL3 1,200 kPa
OFF malfunction (C):
TCM selected gear 2nd
Throttle valve opening angle:
(When condition "D" is not detected) 4.5% or more at engine speed 2,000 rpm (condition varies with engine speed)
(When condition "D" is detected) 1.5% or more at engine speed 750 rpm (condition varies with output speed)
ECT (engine coolant temperature) 40°C (104°F) or more
OFF malfunction (D):
Throttle valve opening angle 1.5% or more at engine speed 750 rpm (condition varies with output speed)
ON malfunction:
TCM selected gear 1st
Vehicle speed 1.2 mph (2 km/h) or more
Engine speed - Turbine speed 50 rpm or more
ECT (engine coolant temperature) 40°C (104°F) or more

TYPICAL MALFUNCTION THRESHOLDS


OFF malfunction (A):
Turbine speed - Output speed x 2nd gear ratio 1,000 rpm or more
OFF malfunction (B):
Turbine speed - Output speed x 6th gear ratio 1,000 rpm or more
OFF malfunction (C):
Input (turbine) speed/Intermediate shaft speed 3.304 to 7.724
OFF malfunction (D):
Input (turbine) speed/Intermediate shaft speed 3.304 to 7.724
ON malfunction:
Input (turbine) speed/Intermediate shaft speed 1.901 to 2.340

INSPECTION PROCEDURE

Note

Perform the universal trip to clear permanent DTCs Click here.

PROCEDURE


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


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

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

    5. Read the DTCs using the Techstream.

      Result
      Display (DTC Output) Proceed to
      Only "P0796" is output A
      "P0796" and other DTCs are output B

      Tech Tips

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


    A

    INSPECT SHIFT SOLENOID VALVE SL3 Click here

    B

  2. PERFORM ACTIVE TEST USING TECHSTREAM

    Note

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


    1. Warm up the engine.

    2. Turn the engine switch off.

    3. Connect the Techstream to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the Techstream on.

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

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

      Tech Tips

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

      Tester Display Test Details Control Range Diagnostic Note
      Control the Shift Position Operates the shift solenoid valves to allow gears to selected manually.

      • Press "→" button: Upshift occurs

      • Press "←" button: Downshift occurs

      Can be used to check the operation of the shift solenoid valves.

      Upshifts and downshifts should be performed consecutively. A 10-second interval is required between gear changes.

      Do not downshift at high speeds. Doing so will damage the automatic transaxle.

      [Vehicle Condition]

      50 km/h (31 mph) or less

      Note


      • This test can be conducted when the vehicle is stopped.

      • When shifting gears using the Active Test function, do not operate the accelerator pedal for 2 seconds before and after shifting gears.

      Tech Tips

      The gear commanded by the TCM is shown in the Data List / Shift Status display on the Techstream.

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

      Tech Tips

      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)

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

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

      Tech Tips


      • *1: Neutral

      • *2: If shift solenoid 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: When shift solenoid SLT is stuck off, gear shifting is normal.


    A

    GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL1) PERFORMANCE DTC P0746) Click here

    B

    GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL2) PERFORMANCE DTC P0776) Click here

    D

    GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL4) PERFORMANCE DTC P2808) Click here

    E

    GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SLT) PERFORMANCE DTC P2714) Click here

    C

  3. INSPECT SHIFT SOLENOID VALVE SL3


    1. A01HYJZE01
      Text in Illustration
      *1 Shift Solenoid Valve SL3

      Remove shift solenoid valve SL3.

    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. 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.
      Result
      Result Proceed to
      OK A
      NG (When not using the engine support bridge) B
      NG (When using the engine support bridge) C

    B

    REPLACE SHIFT SOLENOID VALVE SL3 Click here

    C

    REPLACE SHIFT SOLENOID VALVE SL3 Click here

    A

  4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly.


      • When not using the engine support bridge: Click here

      • When using the engine support bridge: Click here

      OK
      There are no foreign objects on each valve and they operate smoothly.
      Result
      Result Proceed to
      OK (When not using the engine support bridge) A
      OK (When using the engine support bridge B
      NG (When not using the engine support bridge) C
      NG (When using the engine support bridge) D

    B

    REPLACE AUTOMATIC TRANSAXLE ASSEMBLY Click here

    C

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    D

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    A

    REPLACE AUTOMATIC TRANSAXLE ASSEMBLY Click here