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 INTELLIGENT TESTER
INSPECT SHIFT SOLENOID VALVE (SL3)
INSPECT TRANSMISSION VALVE BODY ASSEMBLY
INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
DTC P0796 Pressure Control Solenoid "C" Performance (Shift Solenoid Valve SL3) |
SYSTEM DESCRIPTION
The TCM uses the vehicle speed signal to determine the actual gear position (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 shift solenoid valves and valve body mechanical problems.DTC No.
| DTC Detecting Condition
| Trouble Area
|
P0796
| The engine revs freely when 2nd or 6th gear is requested (2-trip detection logic)
When the following is detected twice (2-trip detection logic):
- When 1st gear is requested, 2nd gear is engaged.
| - Shift solenoid valve SL3 (open or closed)
- Valve body (blocked)
- Automatic transaxle (clutch, brake or gear etc.)
|
MONITOR DESCRIPTION
The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th, 5th or 6th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL and stores the DTC.
INSPECTION PROCEDURE
| 1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0796) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch on and turn the intelligent tester on.
Enter the following items: "Powertrain / ECT / DTC / Current or Pending".
Read the DTCs using the intelligent tester.
- Result:
Display (DTC output)
| Proceed to
|
Only "P0796" is output
| A
|
"P0796" and other DTCs
| B
|
- HINT:
- If a solenoid is stuck OFF, DTCs for several solenoids including the malfunctioning solenoid will be detected.
| 2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER |
- NOTICE:
- This test should always be performed with at least 2 people.
Connect the intelligent tester to the DLC3.
Start the engine and turn the intelligent tester on.
Enter the following items: "Powertrain / ECT / Active Test / Control the Shift Position".
- HINT:
- Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (CAMRY_ACV40 RM000000O8L02IX.html).
Item
| Test Details
| Diagnostic Note
|
Control the Shift Position
| [Test Details]
Operate the shift solenoid valve and set each shift position by yourself.
[Others]
- Press "←" button: Shift up
- Press "→" button: Shift down
| Possible to check the operation of the shift solenoid valves.
|
- NOTICE:
- 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.
- HINT:
- The shift position commanded by the TCM is shown in the "Data List / Shift Status" display on the intelligent tester.
Check the vehicle speed and the gear position when the engine speed is 1,000 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)
|
Compare the TCM gear shift command and the actual gear position.
- Result:
Actuator gear position under malfunction
| TCM gear shift command
| 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
|
- HINT:
- *1: Neutral
- *2: If the 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 the shift solenoid SLT is stuck OFF, gear shifting is normal.
| | GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL1) PERFORMANCE DTC P0746) |
|
|
| | GO TO DTC CHART (RELATED SHIFT SOLENOID VAVLE (SL2) PERFORMANCE DTC P0776) |
|
|
| | GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL4) PERFORMANCE DTC P2808) |
|
|
| | GO TO DTC CHART (RELATED SHIFT SOLENOID VAVLE (SLT) PERFORMANCE DTC P2714) |
|
|
| 3.INSPECT SHIFT SOLENOID VALVE (SL3) |
Remove the shift solenoid valve SL3.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Specified Condition
20°C (68°F)
|
1 - 2
| 5.0 to 5.6 Ω
|
Connect a positive (+) lead through a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.
- OK:
- The solenoid makes an operating noise.
| | REPLACE SHIFT SOLENOID VALVE (SL3) |
|
|
| 4.INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
- OK:
- There are no foreign objects on each valve and they operate smoothly.
| | REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
|
|
| 5.INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY |
- OK:
- The torque converter clutch operates normally.
| | REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY |
|
|
| OK |
|
|
|
| REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY |
|
