DTC Advanced Diagnostics: P0766
DTC P0766 : Shift Solenoid Valve D Stuck OFF
General Description
Shift solenoid valve D is installed on the valve body assembly. It is controlled by the ON/OFF signal from the transmission control module (TCM) to apply line pressure to the B1 cut valve. The B1 cut valve does not operate when shift solenoid valve D is OFF, and operates when it is ON. Transmission fluid pressure switch A is installed on the hydraulic passage where transmission fluid pressure switch A outputs ON when the B1 cut valve is not operating. Since the B1 cut valve does not operate when shift solenoid valve D is OFF, the hydraulic pressure is output from the B1 cut valve and turns transmission fluid pressure switch A to ON. Contrary, the B1 cut valve operates when shift solenoid D is ON, the hydraulic pressure is cut off from the B1 cut valve and turns transmission fluid pressure switch A to OFF. For detecting the malfunction, the TCM uses the values of transmission fluid pressure switch A and transmission fluid pressure sensor E when the B1 cut valve is operated. If transmission fluid pressure switch A is ON and the value of transmission fluid pressure sensor E is in abnormal range for a specified time when the B1 cut valve is operated, the TCM detects a shift solenoid valve D stuck off failure and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1.5 seconds or more |
| DTC Type | Two drive cycles, MIL on, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Engine speed [Engine Speed] | 500 rpm | - | |
| 12 volt battery voltage [Battery Voltage] | 10 V | - | |
| Control command to shift solenoid valve D | ON | ||
| Other | Value of transmission fluid pressure sensors A, B, C, D, and F are 300 kPa (3.06 kgf/cm 2, 43.5 psi) or less | ||
[ ]: HDS Parameter
Malfunction Threshold
Transmission fluid pressure switch A is ON and the value of transmission fluid pressure sensor E is more than 200 kPa (2.0 kgf/cm 2, 29.0 psi) for at least 1.5 seconds when the B1 cut valve is operated.
Possible Cause
- Valve body assembly failure (shift solenoid valve D stuck off)
Confirmation Procedure
Operating Condition
Start the engine, and wait for several seconds in P position/mode.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the TCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on, the shift position indicator blinks, and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.