DTC P0776 Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2) |
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SYSTEM 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 or gear, etc.).
DTC No. | DTC Detection Condition | Trouble Area |
P0776 | The gear required by the ECM does not match the actual gear when driving (2-trip detection logic) |
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MONITOR DESCRIPTION
This DTC indicates "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/ON malfunction |
Required sensors/Components (Main) | Shift solenoid valve SL2 |
Required sensors/Components (Related) | Speed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE) |
Frequency of operation | Continuous |
Duration | ON malfunction (A), (B) and (C): 0.4 seconds ON malfunction (D): 3 seconds ON malfunction (E): 0.5 seconds |
MIL operation | 2 driving cycles |
Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not present | P0717 (Turbine speed sensor circuit) P0722 (Output speed sensor circuit) P0973, P0974 (Shift solenoid valve S1 circuit) P0976, P0977 (Shift solenoid valve S2 circuit) P0976, P0977 (Shift solenoid valve S2 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 range | "D" |
Duration time from shifting "N" to "D" | 4 seconds or more |
ECT | 40°C (104°F) or more |
Spark advance from Max. retard timing by KCS control | 0° CA or more |
Engine | Starting |
ECM selected gear | 1st |
Vehicle speed | 2 to 40 km/h (1.2 to 24.9 mph) |
Throttle valve opening angle | 8% or more (When actual gear is 4th) 6.5% or more at 2000 rpm (Varies with engine speed) |
ECM selected gear | 3rd |
Vehicle speed | 2 km/h (1.2 mph) or more |
Throttle valve opening angle | 6.5% or more at 2000 rpm (Varies with engine speed) |
ECM selected gear | 4th |
Vehicle speed | 2 km/h (1.2 mph) or more |
Throttle valve opening angle | 6.5% or more at 2000 rpm (Varies with engine speed) |
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) |
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
Both of the following conditions are met:- ON malfunction (A) and (B), or ON malfunction (C)
- ON malfunction (D) or (E)
Turbine speed/Output speed | 3.30 to 7.50 |
Turbine speed/Output speed | 1.28 to 1.53 |
Turbine speed/Output speed | 0.93 to 1.07 |
Turbine speed - Output speed x 4th gear ratio (NT - NO x 4th gear ratio) | 1000 rpm or more |
Turbine speed - Output speed x 5th gear ratio (NT - NO x 5th gear ratio) | 1000 rpm or more |
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (Click here).
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.
Warm up the engine.
Turn the ignition switch off.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Active Test.
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 (Click here).
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 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
1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0776) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs using the Techstream.
Result Display (DTC output) 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.
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A | |
2.PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT) |
- NOTICE:
- Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).
- Be careful to prevent SST hose from interfering with the exhaust pipe.
- This check must be conducted after checking and adjusting engine.
- Perform with the A/C OFF.
- 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.
- It is possible to display the Data List during the Active Test.
Turn the ignition switch off.
Lift the vehicle up.
Remove the test plug on the transmission case center right side and connect SST.
Lower the vehicle.
Fully apply the parking brake and chock the 4 wheels.
Connect the Techstream to the DLC3.
Start the engine and warm it up.
Measure the line pressure when the engine is idling.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Active Test.
Follow the instructions on the Techstream and perform the Active Test.
Measure the line pressure with SST.
Engine and ECT Tester Display Test Part Control Range Diagnostic Note Activate the Solenoid (SLT)* Operate the shift solenoid SLT and raise line pressure ON or OFF - HINT:
- OFF: Line pressure up (when Active Test "Activate the Solenoid (SLT)" is performed, ECM commands SLT solenoid to turn OFF)
- ON: No action (normal operation)
[Vehicle Condition] - Vehicle stopped
- Engine idling
- HINT:
- *: Activate the Solenoid (SLT) in the Active Test is performed to check the line pressure changes by connecting SST to the automatic transmission, which is used in the Hydraulic Test (Click here) as well.
- Please note that the pressure values in Active Test and Hydraulic Test are different from each other.
- OK:
- The line pressure changes as specified when performing the Active Test.
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OK | |
3.INSPECT SHIFT SOLENOID VALVE SL2 |
Remove the shift solenoid valve SL2.
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
Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
- OK:
- The solenoid makes an operating sound.
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OK | |
4.INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
Check the transmission valve body assembly (Click here).
- OK:
- There are no foreign objects on any valve.
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OK | ||
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