DTC P0778 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2) |
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DESCRIPTION
Shifting from 1st to 5th is performed in combination with the "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which are controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (Click here).DTC Code | DTC Detection Condition | Trouble Area |
P0778 | The ECM checks for an open or short in the shift solenoid valve SL2 circuit while driving and shifting gears (1 trip detection logic) Output signal duty ratio equals 100%
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MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Then the ECM performs the fail-safe function and turns the other normal shift solenoid valves "ON/OFF". (In case of an open or short circuit, the ECM stops sending current to the circuit.)While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction (Click here).
MONITOR STRATEGY
Related DTCs | P0778: Shift solenoid valve SL2/Range check |
Required sensors/Components | Shift solenoid valve SL2 |
Frequency of operation | Continuous |
Duration | 1 sec. |
MIL operation | Immediately |
Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not present | None |
Ignition switch | ON |
Starter | OFF |
Solenoid current cut status | Not cut |
Battery voltage | 11 V or more |
TYPICAL MALFUNCTION THRESHOLDS
Solenoid status from MIC | Failure |
COMPONENT OPERATING RANGE
Output signal duty | Less than 100% |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Perform the universal trip to clear permanent DTCs (Click here).
- HINT:
- The shift solenoid valve SL2 turns ON/OFF normally when the shift lever is in the D position.
ECM gear shift command | 1st | 2nd | 3rd | 4th | 5th |
Shift solenoid valve SL2 | ON | ON | ON | ON | OFF |
1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2) |
Disconnect the D63 transmission wire connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition 11 (SL2+) - 3 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω 11 (SL2+) - Body ground Always 10 kΩ or higher 3 (SL2-) - Body ground Always 10 kΩ or higher
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OK | |
2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Disconnect the D74 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition D74-12 (SL2+) - D74-13 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω D74-12 (SL2+) - Body ground Always 10 kΩ or higher D74-13 (SL2-) - Body ground Always 10 kΩ or higher
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OK | ||
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3.INSPECT SHIFT SOLENOID VALVE SL2 |
Remove shift solenoid valve SL2.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition Terminal 1 of shift solenoid valve SL2 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
Connect the battery's positive (+) lead with a 21 W bulb to terminal 1 and the negative (-) lead to terminal 2 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
- OK:
- Valve moves and makes an operating noise.
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OK | ||
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