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, gear, etc.).
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
P0776 |
Gear required by the ECM does not match the actual gear when driving (2-trip detection logic). |
|
MONITOR DESCRIPTION
This DTC indicates a 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/Functional check |
Required sensors/Components |
Shift solenoid valve SL2, Speed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE) |
Frequency of operation |
Continuous |
Duration |
ON malfunction (A), (B) and (C): 0.4 sec. ON malfunction (D): 3 sec. ON malfunction (E): 0.5 sec. |
MIL operation |
2 driving cycles |
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All
The monitor will run whenever the following DTCs are not stored |
P0717 (Turbine speed sensor circuit) P0722 (Output speed sensor circuit) P0973, P0974 (Shift solenoid valve S1 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 position |
"D" |
Duration time from shifting "N" to "D" |
4 sec. or more |
ECT |
40°C (104°F) or higher |
Spark advance from max. retard timing by KCS control |
0° crankshaft angle or more |
Engine |
Starting |
ECM selected gear |
1st |
Duration time for vehicle speed to reach 2 km/h (1.2 mph) |
Less than 3 sec. |
Duration time from shift command of ECM |
2 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) or more, and less than 40 km/h (24.9 mph) |
Throttle valve opening angle |
8% or more (When actual gear is 4th) 6.5% or more at 2000 rpm (Conditions vary with engine speed) |
Calculated load value |
7.75% or more |
Following conditions is met: (a), (b), (c), (d) or (e) |
- |
(a) Turbine speed/Output speed (NT/NO) |
3.30 or more, and 7.50 or less (This means actual gear is 1st) |
(b) Turbine speed/Output speed (NT/NO) |
1.91 or more, and 2.35 or less (This means actual gear is 2nd) |
(c) Turbine speed/Output speed (NT/NO) |
1.28 or more, and 1.53 or less (This means actual gear is 3rd) |
(d) Turbine speed/Output speed (NT/NO) |
0.93 or more, and 1.07 or less (This means actual gear is 4th) |
(e) Turbine speed/Output speed (NT/NO) |
0.65 or more, and 0.79 or less (This means actual gear is 5th) |
ECM selected gear |
3rd |
Duration time from shift command of ECM |
2 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) or more |
Throttle valve opening angle |
6.5% or more at 2000 rpm (Conditions vary with engine speed) |
Calculated load value |
7.75% or more |
Following conditions is met: (a), (b), (c), (d) or (e) |
- |
(a) Turbine speed/Output speed (NT/NO) |
3.30 or more, and 7.50 or less (This means actual gear is 1st) |
(b) Turbine speed/Output speed (NT/NO) |
1.91 or more, and 2.35 or less (This means actual gear is 2nd) |
(c) Turbine speed/Output speed (NT/NO) |
1.28 or more, and 1.53 or less (This means actual gear is 3rd) |
(d) Turbine speed/Output speed (NT/NO) |
0.93 or more, and 1.07 or less (This means actual gear is 4th) |
(e) Turbine speed/Output speed (NT/NO) |
0.65 or more, and 0.79 or less (This means actual gear is 5th) |
ECM selected gear |
4th |
Duration time from shift command of ECM |
2 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) or more |
Throttle valve opening angle |
6.5% or more at 2000 rpm (Conditions vary with engine speed) |
Calculated load value |
7.75% or more |
Following conditions is met: (a), (b), (c), (d) or (e) |
- |
(a) Turbine speed/Output speed (NT/NO) |
3.30 or more, and 7.50 or less (This means actual gear is 1st) |
(b) Turbine speed/Output speed (NT/NO) |
1.91 or more, and 2.35 or less (This means actual gear is 2nd) |
(c) Turbine speed/Output speed (NT/NO) |
1.28 or more, and 1.53 or less (This means actual gear is 3rd) |
(d) Turbine speed/Output speed (NT/NO) |
0.93 or more, and 1.07 or less (This means actual gear is 4th) |
(e) Turbine speed/Output speed (NT/NO) |
0.65 or more, and 0.79 or less (This means actual gear is 5th) |
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
ON malfunction (A) and (B), or ON malfunction (C)
ON malfunction (D) or (E)
Turbine speed/Output speed (NT/NO) |
3.30 or more, and 7.50 or less (This means actual gear is 1st) |
Turbine speed/Output speed (NT/NO) |
1.28 or more, and 1.53 or less (This means actual gear is 3rd) |
Turbine speed/Output speed (NT/NO) |
0.93 or more, and 1.07 or less (This means actual gear is 4th) |
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 |
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page ).
1. 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.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test.
(g) 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 (See page ).
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Control the Shift Position |
Operate shift solenoid valve and set each shift position |
|
Possible to check operation of the shift solenoid valves. [Vehicle Condition] 50 km/h (31 mph) or less. |
HINT:
ECM gear shift command |
1st |
2nd |
3rd |
4th |
5th |
Shift solenoid valve SL2 |
ON |
ON |
ON |
ON |
OFF |
PROCEDURE
1. |
CHECK DTC OUTPUT (IN ADDITION TO DTC P0776) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result
Result |
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.
B |
GO TO DTC CHART |
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT) |
NG |
REPLACE SHIFT SOLENOID VALVE SLT |
|
3. |
INSPECT SHIFT SOLENOID VALVE SL2 |
(a) Remove shift solenoid valve SL2.
(b) 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 |
(c) 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 |
---|---|
|
Valve moves and makes operating noise |
*a |
Component without harness connected (Shift Solenoid Valve SL2) |
NG |
REPLACE SHIFT SOLENOID VALVE SL2 |
|
4. |
INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
OK |
REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY |
NG |
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the wiper and washer system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Inspection
INSPECTION
PROCEDURE
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(a) As shown in the illustration, flip the ball joint stud back and forth
5 times before installing the nut.
(b) Using a torque ...